tannins and Neoplasms

The ineffectiveness of traditional cancer therapies due to drug resistance, nontargeted delivery, and chemotherapy-associated adverse side effects has shifted attention to bioactive phytochemicals. Consequently, research efforts toward screening and identification of natural compounds with anticancer properties have increased in recent years. Marine seaweed-derived bioactive compounds, such as polyphenolic compounds, have exhibited anticancer properties. Phlorotannins (PTs), a major group of seaweed-derived polyphenolic compounds, have emerged as powerful chemopreventive and chemoprotective compounds, regulating apoptotic cell death pathways both in vitro and in vivo. In this context, this review focuses on the anticancer activity of polyphenols isolated from brown algae, with a special reference to PTs. Furthermore, we highlight the antioxidant effects of PTs and discuss how they can impact cell survival and tumor development and progression. Moreover, we discussed the potential therapeutic application of PTs as anticancer agents, having molecular mechanisms involving oxidative stress reduction. We have also discussed patents or patent applications that apply PTs as major components of antioxidant and antitumor products. With this review, researcher may gain new insights into the potential novel role of PTs, as well as uncover a novel cancer-prevention mechanism and improve human health.

Topics: Antineoplastic Agents; Antioxidants; Humans; Neoplasms; Phaeophyceae; Seaweed; Tannins

Significant advancements have been noticed in cancer therapy for decades. Despite this, there are still many critical challenges ahead, including multidrug resistance, drug instability, and side effects. To overcome obstacles of these problems, various types of materials in biomedical research have been explored. Chief among them, the applications of natural compounds have grown rapidly due to their superb biological activities. Natural compounds, especially polyphenolic compounds, play a positive and great role in cancer therapy. Tannic acid (TA), one of the most famous polyphenols, has attracted widespread attention in the field of cancer treatment with unique structural, physicochemical, pharmaceutical, anticancer, antiviral, antioxidant and other strong biological features. This review concentrated on the basic structure along with the important role of TA in tuning oncological signal pathways firstly, and then focused on the use of TA in chemotherapy and preparation of delivery systems including nanoparticles and hydrogels for cancer therapy. Besides, the application of TA/Fe

Topics: Biocompatible Materials; Humans; Neoplasms; Polyphenols; Tannins

In recent years, an increased interest in marine macroalgae bioactive compounds has been recorded due to their benefits to human health and welfare. Several of their bioactivities have been demonstrated, such as anti-inflammatory, antioxidant, anticarcinogenic, antibacterial and antiviral behavior. However, there still lacks a clear definition regarding how these compounds exert their bioactive properties. Of all the bioactive compounds derived from marine macroalgae, attention has been focused on phenolic compounds, specifically in phlorotannins, due to their potential for biomedical applications. Phlorotannins are a diverse and wide group of phenolic compounds, with several structural variations based on the monomer phloroglucinol. Among the diverse phlorotannin structures, the eckol-family of phlorotannins demonstrates remarkable bioactivity, notably their anti-tumoral properties. However, the molecular mechanisms by which this activity is achieved remain elusive and sparse. This review focuses on the described molecular mechanisms of anti-tumoral effects by the eckol family of compounds and the future prospects of these molecules for potential application in oncology therapies.

Topics: Antioxidants; Humans; Neoplasms; Phaeophyceae; Phenols; Phloroglucinol; Seaweed; Tannins

Tannic acid is a chief gallo-tannin belonging to the hydrolysable tannins extracted from gall nuts and other plant sources. A myriad of pharmaceutical and biological applications in the medical field has been well recognized to tannic acid. Among these effects, potential anticancer activities against several solid malignancies such as liver, breast, lung, pancreatic, colorectal and ovarian cancers have been reported. Tannic acid was found to play a maestro-role in tuning several oncological signaling pathways including JAK/STAT, RAS/RAF/mTOR, TGF-β1/TGF-β1R axis, VEGF/VEGFR and CXCL12/CXCR4 axes. The combinational beneficial effects of tannic acid with other conventional chemotherapeutic drugs have been clearly demonstrated in literature such as a synergistic anticancer effect and enhancement of the chemo-sensitivity in several resistant cases. Yet, clinical applications of tannic acid have been limited owing to its poor lipid solubility, low bioavailability, off-taste, and short half-life. To overcome such obstacles, novel drug delivery systems have been employed to deliver tannic acid with the aim of improving its applications and/or efficacy against cancer cells. Among these drug delivery systems are several types of organic and metallic nanoparticles. In this review, the authors focus on the molecular mechanisms of tannic acid in tuning several neoplastic diseases as well as novel drug delivery systems that can be used for its clinical applications with an attempt to provide a systemic reference to promote the development of tannic acid as a cheap drug and/or drug delivery system in cancer management.

Topics: Antineoplastic Agents; Drug Delivery Systems; Humans; Hydrolyzable Tannins; Nanoparticles; Neoplasms; Tannins

Tannic acid (TA), a large polyphenolic molecule, has long been known for use in food additives, antioxidants, bio-sorbents, animal feed and adhesives due to its intrinsic properties such as antioxidation, metal chelation, and polymerization. Recently, there has been a renewed interest in fabricating engineered advanced materials with TA modification for novel bio-applications. The modification process involves various interactions/reactions based on its diverse chemical structure, contributed by abundant aromatic rings and hydroxyl groups. In addition, the obtained composites are endowed with retained TA activity and novel enhanced properties. Therefore, the aim of this review is to highlight the recent biomedical application of TA-based metal phenolic networks (TA-MPNs) by focusing on their intrinsic properties and the endowed ability for novel engineered functional composites. The potential contributions of TA-MPNs in "Tumor Theranostics", "Anti-Bacterial Ability", "Wound Repair for Skin Regeneration" and "Bone Tissue Regeneration Applications" are summarized in this paper.

Topics: Anti-Bacterial Agents; Antineoplastic Agents; Bacteria; Coordination Complexes; Humans; Neoplasms; Tannins; Theranostic Nanomedicine

The tendency of using herbs extracts or natural compounds extracted from herbs for preventing or treating different illnesses, including cancer, continues to be an alternative to drug use. Many studies of plant compounds aimed at finding substances with selective cytotoxicity on abnormal cells. Phenolic compounds, as important secondary metabolites from plants, are one of them. In this review, the recent literature data from the past five years about anticancer/antitumor effect of flavonoids and tannins extracted from medicinal plants are surveyed. The cytostatic/antitumor effects of the individual compounds extracted from plants and/or of the plants' polyphenolic extracts are considered, in order to point out the most significant constituents or plants with anticancer potential. The most important results concerning these compounds and their derivatives in cancer prevention and treatment, the importance of their chemical structure, their mechanism of action in vitro and in vivo, and some bioavailability aspects are discussed.

Topics: Antineoplastic Agents, Phytogenic; Cell Proliferation; Drug Screening Assays, Antitumor; Flavonoids; Humans; Molecular Structure; Neoplasms; Plant Extracts; Plants, Medicinal; Tannins

mHealth interventions often favour individual-level effects. This is particularly problematic in contexts where social support and shifts in social norms are critical to sustained behaviour change. Mobile digital games represent a promising health education strategy for youth, including in low-resource settings. We sought to better understand the interpersonal and social interactions that can be elicited by digital games for health.. This study took place in Kisumu, Kenya, in Spring 2017.. Descriptive statistics were computed from survey responses and log files. Focus group transcripts were labelled, analysed thematically, and compared demographically using MaxQDA software.. Data from log files, survey and focus groups indicate that the game generated considerable interaction and dialogue with parents, siblings, and friends, and served as a catalyst for children to act as advocates for healthful decisions about sex, both within the family and beyond. The game showed a high level of acceptability with parents.. Serious digital games using a smartphone platform can generate considerable household interaction. Games can model and facilitate these exchanges, maximising multi-level effects. An additional app for parents could reinforce these effects.. The online version contains supplementary material available at 10.1007/s00024-021-02793-0.. OPCAB is a safe and effective revascularization strategy in patients with stage 2 and stage 3 CKD. Short-term outcomes of OPCAB have been good in the patient population in this study, in terms of both surgical morbidity and mortality. Surgical mortality was 1.9%. New-onset atrial fibrillation was found in eleven patients (9.6%) in the stage 2 CKD group and 42 patients (21%) in the stage 3 CKD group (. The online version contains supplementary material available at 10.1007/s12298-021-01021-2.. Although BMD was not significantly different between subjects with MND-ALS and healthy controls, BTMs were significantly higher in the MND group indicating a high bone turnover state. Sarcopenia and sarcopenic obesity were also more in MND-ALS group than controls. Routine assessment for bone health parameters and body composition indices may be included in management of the patients with MND.. The aqueous extract of. Grapefruit peel extracts and their AgNPs exhibit antibacterial properties that can be exploited for the synthesis of new antimicrobials and their EEs may be efficiently used synergistically with other antibiotics against bacteria with intermediate susceptibility.. The nonconventional feeds have moderate protein and reduced fiber contents, and thus, they can be utilized as supplement for poor-quality feeds. These feeds need further investigation using animals to substantiate the current study.

Topics: Adult; Age Factors; Aged; Aged, 80 and over; Ambulances; Animal Feed; Animals; Apoptosis; Bilirubin; Biomarkers; Blood Pressure; Blood Transfusion; Brain; Brain-Gut Axis; Breast Neoplasms; Candida albicans; Candidemia; Carcinoma, Hepatocellular; Carcinoma, Medullary; Carcinoma, Neuroendocrine; Cardiometabolic Risk Factors; Cardiopulmonary Resuscitation; Cardiorespiratory Fitness; Cardiovascular Diseases; CD8-Positive T-Lymphocytes; Cell Line, Tumor; Cell Proliferation; Cell Survival; Cerebrovascular Circulation; Chemokine CXCL12; Chemotaxis; China; Cholesterol; Cholesterol, HDL; Cohort Studies; COVID-19; Croatia; Cross-Over Studies; Cross-Sectional Studies; Dental Bonding; Dentin; Digestion; Disease Models, Animal; Disease Progression; Down-Regulation; Doxorubicin; Drug Combinations; Drug Screening Assays, Antitumor; Drug Synergism; Dry Eye Syndromes; Electrocardiography; Emergency Medical Technicians; Ergonomics; Ethiopia; Exercise Tolerance; Fatigue; Feasibility Studies; Female; Follow-Up Studies; G1 Phase Cell Cycle Checkpoints; Gene Expression Regulation, Neoplastic; Germany; Glomerular Filtration Rate; Glomerulonephritis, IGA; Hepatectomy; Humans; Hydrophobic and Hydrophilic Interactions; Hypothermia, Induced; Image Processing, Computer-Assisted; Infusions, Intravenous; Jugular Veins; Kaplan-Meier Estimate; Kidney Failure, Chronic; Kidney Transplantation; Lipoproteins; Liposomes; Liver; Liver Neoplasms; Liver Regeneration; Male; Manikins; Masks; Mass Screening; Metabolic Syndrome; Mice; Mice, Transgenic; Middle Aged; Nanoparticles; Neoplasms; Out-of-Hospital Cardiac Arrest; Phthalic Anhydrides; Plant Extracts; Police; Polyethylene Glycols; Polyethyleneimine; Predictive Value of Tests; Preoperative Care; Prevalence; Prognosis; Prospective Studies; Proto-Oncogene Mas; Proto-Oncogene Proteins c-ret; Pyrazoles; Pyridines; Rats; Rats, Sprague-Dawley; Receptors, CXCR4; Resuscitation; Risk Assessment; Risk Factors; Saline Solution; Salmonella; Salmonella Vaccines; SARS-CoV-2; Sedentary Behavior; Sex Factors; Shock, Hemorrhagic; Simulation Training; Sports; ST Elevation Myocardial Infarction; Stretchers; Support Vector Machine; Surveys and Questionnaires; Tannins; Thyroid Neoplasms; Time Factors; TOR Serine-Threonine Kinases; Treatment Outcome; Tuberous Sclerosis Complex 1 Protein; Waist Circumference; Young Adult

Cancer is a major health problem worldwide and still lacks fully effective treatments. Therefore, alternative therapies, using natural products, have been proposed. Marine algae are an important component of the marine environment, with high biodiversity, and contain a huge number of functional compounds, including terpenes, polyphenols, phlorotannins, and polysaccharides, among others. These compounds have complex structures that have shown several biological activities, including anticancer activity, using in vitro and in vivo models. Moreover, seaweed-derived compounds target important molecules that regulate cancer processes. Here, we review our current understanding of the anticancer activity of seaweeds.

Topics: Animals; Antineoplastic Agents; Humans; Neoplasms; Polyphenols; Polysaccharides; Seaweed; Tannins; Terpenes

Tannins, polyphenols in medicinal plants, have been divided into two groups of hydrolysable and condensed tannins, including gallotannins, ellagitannins, and (-)-epigallocatechin-3-gallate (EGCG). Potent anticancer activities have been observed in tannins (especially EGCG) with multiple mechanisms, such as apoptosis, cell cycle arrest, and inhibition of invasion and metastases. Furthermore, the combinational effects of tannins and anticancer drugs have been demonstrated in this review, including chemoprotective, chemosensitive, and antagonizing effects accompanying with anticancer effect. However, the applications of tannins have been hindered due to their poor liposolubility, low bioavailability, off-taste, and shorter half-life time in human body, such as EGCG, gallic acid, and ellagic acid. To tackle these obstacles, novel drug delivery systems have been employed to deliver tannins with the aim of improving their applications, such as gelatin nanoparticles, micelles, nanogold, liposomes, and so on. In this review, the chemical characteristics, anticancer properties, and drug delivery systems of tannins were discussed with an attempt to provide a systemic reference to promote the development of tannins as anticancer agents.

Topics: Animals; Antineoplastic Agents; Drug Delivery Systems; Humans; Neoplasms; Tannins

Angiogenesis, or new blood vessel formation, is an important process in the pathogenesis of several diseases and thus has been targeted for the prevention and treatment for many disorders. However, the anti-angiogenic agents that are currently in use are mainly synthetic compounds and humanized monoclonal antibodies, which are either expensive or toxic, thereby limiting their use in many patients. Therefore, it is necessary to identify less toxic, inexpensive, novel and effective anti-angiogenic molecules. Several studies have indicated that natural plant products can meet these criteria. In this review, we discuss the anti-angiogenic properties of natural compounds isolated from plants and the molecular mechanisms by which these molecules act. Finally, we summarize the advantages of using plant products as anti-angiogenic agents. Compared with currently available anti-angiogenic drugs, plant products may not only have similar therapeutic potential but are also inexpensive, less toxic, and easy to administer. However, novel and effective strategies are necessary to improve their bioavailability for clinical use.

Topics: Alkaloids; Angiogenesis Inhibitors; Animals; Biological Products; Humans; Neoplasms; Neovascularization, Pathologic; Plant Extracts; Plants, Medicinal; Polyphenols; Tannins; Terpenes

The oxidative pentose phosphate pathway (PPP) contributes to tumour growth, but the precise contribution of 6-phosphogluconate dehydrogenase (6PGD), the third enzyme in this pathway, to tumorigenesis remains unclear. We found that suppression of 6PGD decreased lipogenesis and RNA biosynthesis and elevated ROS levels in cancer cells, attenuating cell proliferation and tumour growth. 6PGD-mediated production of ribulose-5-phosphate (Ru-5-P) inhibits AMPK activation by disrupting the active LKB1 complex, thereby activating acetyl-CoA carboxylase 1 and lipogenesis. Ru-5-P and NADPH are thought to be precursors in RNA biosynthesis and lipogenesis, respectively; thus, our findings provide an additional link between the oxidative PPP and lipogenesis through Ru-5-P-dependent inhibition of LKB1-AMPK signalling. Moreover, we identified and developed 6PGD inhibitors, physcion and its derivative S3, that effectively inhibited 6PGD, cancer cell proliferation and tumour growth in nude mice xenografts without obvious toxicity, suggesting that 6PGD could be an anticancer target.

Topics: AMP-Activated Protein Kinase Kinases; AMP-Activated Protein Kinases; Humans; Lipogenesis; Neoplasms; Oxidative Stress; Pentose Phosphate Pathway; Phosphogluconate Dehydrogenase; Protein Serine-Threonine Kinases; Ribulosephosphates; Signal Transduction

Sorghum and millet grains are generally rich in phytochemicals, particularly various types of phenolics. However, the types and amounts vary greatly between and within species. The food-processing operations applied to these grains, i.e. dehulling and decortication, malting, fermentation and thermal processing, dramatically affect the quantity of phenolics present, most generally reducing them. Thus the levels of phytochemicals in sorghum and millet foods and beverages are usually considerably lower than in the grains. Notwithstanding this, there is considerable evidence that sorghum and millet foods and beverages have important functional and health-promoting effects, specifically antidiabetic, cardiovascular disease and cancer prevention, due to the actions of these phytochemicals. Also their lactic acid bacteria-fermented products may have probiotic effects related to their unique microflora. However, direct proof of these health-enhancing effects is lacking as most studies have been carried out on the grains or grain extracts and not the food and beverage products themselves, and also most research work has been in vitro or ex vivo and not in vivo. To provide the required evidence, better designed studies are needed. The sorghum and millet products should be fully characterised, especially their phytochemical composition. Most importantly, well-controlled human clinical studies and intervention trials are required.

Topics: Animals; Cardiovascular Diseases; Edible Grain; Food Handling; Functional Food; Hot Temperature; Humans; Hypoglycemic Agents; Neoplasms; Poaceae; Polyphenols; Probiotics; Sorghum; Tannins

Natural phenolic compounds have been considered as one of the interesting secondary metabolites for their chemopreventive and chemotherapeutic effects in cancer for a long time. These are a large and diverse family of phytochemicals classified into several subgroups such as simple phenols, lignans, phenylpropanoids, flavonoids, coumarins, etc. The antioxidant potential of phenolic compounds is almost bolded in the treatment and prevention of cancer. Due to the concerns on the diverse effects of antioxidants in cancer, differentiation and clarification of their anti-neoplastic mechanisms are necessary. An important mechanism for phenolic compounds is related to their direct effect on the cell cycle progression, which has not been discussed in detail so far. This study aims to criticize the evidence on regulatory mechanisms of phenolic compounds in the cell cycle. Recent studies indicate that phenolic compounds from several subgroups significantly inhibit the proliferation of different cancer cells. The structural diversity of these compounds influences various components involved in cell cycle regulation. Forming active metabolites and sensitizing cancerous cells to chemotherapeutic medicines are additional values of these compounds. In the recent years, many studies on neoplastic cell cultures have been carried out to investigate the mechanisms of action of these compounds but dissimilarity of in vitro systems in comparison with human body in terms of metabolism and bioavailability is a major concern. Therefore, further studies are still needed.

Topics: Animals; Anticarcinogenic Agents; Cell Cycle; Chemoprevention; Flavonoids; Humans; Hydrocarbons, Aromatic; Hydroxybenzoates; Neoplasms; Tannins; Xanthones

Sorghum is a rich source of various phytochemicals including tannins, phenolic acids, anthocyanins, phytosterols and policosanols. These phytochemicals have potential to significantly impact human health. Sorghum fractions possess high antioxidant activity in vitro relative to other cereals or fruits. These fractions may offer similar health benefits commonly associated with fruits. Available epidemiological evidence suggests that sorghum consumption reduces the risk of certain types of cancer in humans compared to other cereals. The high concentration of phytochemicals in sorghum may be partly responsible. Sorghums containing tannins are widely reported to reduce caloric availability and hence weight gain in animals. This property is potentially useful in helping reduce obesity in humans. Sorghum phytochemicals also promote cardiovascular health in animals. Such properties have not been reported in humans and require investigation, since cardiovascular disease is currently the leading killer in the developed world. This paper reviews available information on sorghum phytochemicals, how the information relates to current phytonutrient research and how it has potential to combat common nutrition-related diseases including cancer, cardiovascular disease and obesity.

Topics: Animals; Anthocyanins; Antioxidants; Cardiovascular Diseases; Edible Grain; Fatty Alcohols; Flavonoids; Fruit; Humans; Molecular Structure; Neoplasms; Obesity; Phenols; Phytosterols; Proanthocyanidins; Sorghum; Tannins

This paper reviewed the biological activities of tannins in cancer prevention and anticancer, and mainly discussed related mechanisms. The results suggest that tannins, whether total tannins or pure tannin compound, have remarkable activity in cancer prevention and anticancer. It has wealthy foreground for developing new cancer prevention agents and/or new anticancer drugs screening among tannin compounds.

Topics: Animals; Antineoplastic Agents, Phytogenic; Flavonoids; Gallic Acid; Humans; Mice; Neoplasms; Phenols; Plants, Medicinal; Polyphenols; Tannins; Tea; Tumor Cells, Cultured

The complex taxon embraced in the Pteridium genus, popularly known as bracken fern and notorious weeds in many parts of the world, is one of the few vascular plants known to induce cancer naturally in animals. It has been known for long to be acutely toxic to livestock and sublethal chronic oral feeding of bracken fronds leads to cancerous lesions in the urinary bladder, or bovine enzootic haematuria (BEH) and ileum of cattle. Bracken poisoning has been attributed chiefly to ptaquiloside, a norsesqui-terpene which is also a potent carcinogen inducing various malignancies in laboratory animals. It is capable of alkylating uncoiled DNAbases at key proto-oncogenes of selected organs. Some human populations also eat young bracken shoots and epidemiological studies in Japan and Brazil have shown a close association between bracken consumption and cancers of the upper alimentary tract. In addition, other studies reveal that the mere presence of bracken swards represents a greater risk to die of gastric adenocarcinoma for people who live more than 20 years in such areas or are exposed in childhood. This work reviews the bracken-cancer connections established by in vitro and in vivo experiments and epidemiological studies in various parts of the world, and provides insights into the possible bridges for bracken carcinogens to reach the human diet. Also, specific points where more research is needed are highlighted.

Topics: Animals; Carcinogens; Humans; Indans; Neoplasms; Plants, Toxic; Sesquiterpenes; Tannins

Topics: Animals; Breast Neoplasms; Carcinogens, Environmental; Colonic Neoplasms; Diet; Dietary Fats; Esophageal Neoplasms; Humans; Liver Neoplasms; Lung Neoplasms; Mammary Neoplasms, Experimental; Neoplasms; Pancreatic Neoplasms; Stomach Neoplasms; Tannins; Urinary Bladder Neoplasms

Recently, the Occupational Safety and Health Administration (OSHA) proposed regulations regarding lists of environmental substances that allegedly pose potential occupational carcinogenic risk. Known carcinogens such as bis(chloromethyl) ether, along with natural substances such as estradiol, estriol, estrone, progesterone, tannic acid, maltose, and lactose, were included in the general OSHA list. Clear distinction between true hazards and essential endogenously formed biochemicals was not made. A major reappraisal of the OSHA list is essential. The revised document should indicate the conditions under which various classes of substances constitute human health hazards -- including dosage levels and routes of entry.. The OSHA (Occupational Safety and Health Administration) considers certain substances to be carcinogenic including such hazardous chemicals as benzo(a)pyrene, asbestos, bis(chloromethyl) ether, 2-naphthylamine, and aflatchines B2 and G1 as well as natural substances such as estradiol, estriol, estrone, progesterone, tannic acid, maltose, and lactose. The results of the carcinogenic effects of these natural substances is in question because of administered dosage levels, chemical structure of the substances, the route the hormones entered the biological system, and testing done in animals and in vitro. Citing lactose, found in milk, and nitrite, found in saliva, as carcinogenics shows a lack of discrimination between authentic carcinogenic hazards and evolved natural chemicals endogenously produced which are essential to survival. It is suggested that OSHA reappraise the substances to indicate the conditions under which substances may be considered a human health hazard including dosages and routes of entry.

Topics: Animals; Carcinogens; Estradiol; Estriol; Estrogens; Estrone; Female; Humans; Lactose; Maltose; Neoplasms; Rats; Tannins

The active compounds which have been isolated from plants and tested in the chemotherapy program of the National Cancer Institute since the inception of the plant program (as part of the Cancer Chemotherapy National Service Center) are listed, classified into types, and discussed in terms of their activity in experimental tumor systems. The tumor systems include the most important ones comprising the regular screen at different times and also the slow-growing tumors, B16 melanoma and Lewis lung carcinoma (new). The structure-antitumor activity relationships bring out the desirability for further investigation of certain types of compounds as possibilities for clinical trial. Notes on the current pharmacologic anc clinical status of certain compounds are also presented.

Topics: Alkaloids; Animals; Antineoplastic Agents, Phytogenic; Humans; Lactones; Neoplasms; Neoplasms, Experimental; Phytotherapy; Plants, Medicinal; Proteins; Quinones; Saponins; Sterols; Structure-Activity Relationship; Tannins; Terpenes

Topics: Aflatoxins; Alkaloids; Animals; Anthraquinones; Anti-Bacterial Agents; Carcinogens; Carcinoma, Hepatocellular; Chemical Phenomena; Chemistry; Glycosides; Humans; Hydrazines; Lactones; Liver Neoplasms; Mycotoxins; Neoplasms; Oils; Peptides; Plants, Edible; Pyrrolidines; Tannins

Topics: Aluminum; Arsenic; Aspergillus; Beryllium; Carcinogens; Carrageenan; Citrus; Croton Oil; Food Contamination; Fruit; Griseofulvin; Herbicides; Humans; Hydrazines; Insecticides; Iron; Metals; Neoplasms; Neoplasms, Experimental; Penicillium; Plants, Edible; Polysaccharides; Rats; Research; Senecio; Tannins; Thiourea

mHealth interventions often favour individual-level effects. This is particularly problematic in contexts where social support and shifts in social norms are critical to sustained behaviour change. Mobile digital games represent a promising health education strategy for youth, including in low-resource settings. We sought to better understand the interpersonal and social interactions that can be elicited by digital games for health.. This study took place in Kisumu, Kenya, in Spring 2017.. Descriptive statistics were computed from survey responses and log files. Focus group transcripts were labelled, analysed thematically, and compared demographically using MaxQDA software.. Data from log files, survey and focus groups indicate that the game generated considerable interaction and dialogue with parents, siblings, and friends, and served as a catalyst for children to act as advocates for healthful decisions about sex, both within the family and beyond. The game showed a high level of acceptability with parents.. Serious digital games using a smartphone platform can generate considerable household interaction. Games can model and facilitate these exchanges, maximising multi-level effects. An additional app for parents could reinforce these effects.. The online version contains supplementary material available at 10.1007/s00024-021-02793-0.. OPCAB is a safe and effective revascularization strategy in patients with stage 2 and stage 3 CKD. Short-term outcomes of OPCAB have been good in the patient population in this study, in terms of both surgical morbidity and mortality. Surgical mortality was 1.9%. New-onset atrial fibrillation was found in eleven patients (9.6%) in the stage 2 CKD group and 42 patients (21%) in the stage 3 CKD group (. The online version contains supplementary material available at 10.1007/s12298-021-01021-2.. Although BMD was not significantly different between subjects with MND-ALS and healthy controls, BTMs were significantly higher in the MND group indicating a high bone turnover state. Sarcopenia and sarcopenic obesity were also more in MND-ALS group than controls. Routine assessment for bone health parameters and body composition indices may be included in management of the patients with MND.. The aqueous extract of. Grapefruit peel extracts and their AgNPs exhibit antibacterial properties that can be exploited for the synthesis of new antimicrobials and their EEs may be efficiently used synergistically with other antibiotics against bacteria with intermediate susceptibility.. The nonconventional feeds have moderate protein and reduced fiber contents, and thus, they can be utilized as supplement for poor-quality feeds. These feeds need further investigation using animals to substantiate the current study.

Topics: Adult; Age Factors; Aged; Aged, 80 and over; Ambulances; Animal Feed; Animals; Apoptosis; Bilirubin; Biomarkers; Blood Pressure; Blood Transfusion; Brain; Brain-Gut Axis; Breast Neoplasms; Candida albicans; Candidemia; Carcinoma, Hepatocellular; Carcinoma, Medullary; Carcinoma, Neuroendocrine; Cardiometabolic Risk Factors; Cardiopulmonary Resuscitation; Cardiorespiratory Fitness; Cardiovascular Diseases; CD8-Positive T-Lymphocytes; Cell Line, Tumor; Cell Proliferation; Cell Survival; Cerebrovascular Circulation; Chemokine CXCL12; Chemotaxis; China; Cholesterol; Cholesterol, HDL; Cohort Studies; COVID-19; Croatia; Cross-Over Studies; Cross-Sectional Studies; Dental Bonding; Dentin; Digestion; Disease Models, Animal; Disease Progression; Down-Regulation; Doxorubicin; Drug Combinations; Drug Screening Assays, Antitumor; Drug Synergism; Dry Eye Syndromes; Electrocardiography; Emergency Medical Technicians; Ergonomics; Ethiopia; Exercise Tolerance; Fatigue; Feasibility Studies; Female; Follow-Up Studies; G1 Phase Cell Cycle Checkpoints; Gene Expression Regulation, Neoplastic; Germany; Glomerular Filtration Rate; Glomerulonephritis, IGA; Hepatectomy; Humans; Hydrophobic and Hydrophilic Interactions; Hypothermia, Induced; Image Processing, Computer-Assisted; Infusions, Intravenous; Jugular Veins; Kaplan-Meier Estimate; Kidney Failure, Chronic; Kidney Transplantation; Lipoproteins; Liposomes; Liver; Liver Neoplasms; Liver Regeneration; Male; Manikins; Masks; Mass Screening; Metabolic Syndrome; Mice; Mice, Transgenic; Middle Aged; Nanoparticles; Neoplasms; Out-of-Hospital Cardiac Arrest; Phthalic Anhydrides; Plant Extracts; Police; Polyethylene Glycols; Polyethyleneimine; Predictive Value of Tests; Preoperative Care; Prevalence; Prognosis; Prospective Studies; Proto-Oncogene Mas; Proto-Oncogene Proteins c-ret; Pyrazoles; Pyridines; Rats; Rats, Sprague-Dawley; Receptors, CXCR4; Resuscitation; Risk Assessment; Risk Factors; Saline Solution; Salmonella; Salmonella Vaccines; SARS-CoV-2; Sedentary Behavior; Sex Factors; Shock, Hemorrhagic; Simulation Training; Sports; ST Elevation Myocardial Infarction; Stretchers; Support Vector Machine; Surveys and Questionnaires; Tannins; Thyroid Neoplasms; Time Factors; TOR Serine-Threonine Kinases; Treatment Outcome; Tuberous Sclerosis Complex 1 Protein; Waist Circumference; Young Adult

Recently, nanomedicine design has shifted from simple nanocarriers to nanodrugs with intrinsic antineoplastic activities for therapeutic performance optimization. In this regard, degradable nanomedicines containing functional inorganic ions have blazed a highly efficient and relatively safe ion interference paradigm for cancer theranostics. Herein, given the potential superiorities of infinite coordination polymers (ICPs) in degradation peculiarity and functional integration, a state-of-the-art dual-ICP-engineered nanomedicine is elaborately fabricated

Topics: Antineoplastic Agents; Humans; Ions; Iron; Nanomedicine; Neoplasms; Oxidative Stress; Polymers; Tannins

Natural phenolic compounds have antioxidant properties owing to their free radical-scavenging capability. The combined effect of a mixture of phenolic compounds has been studied; however, the detailed investigation for finding a correlation between single phenolic molecules and antioxidant activity has not been explored. Herein, we revealed that the number of phenolic hydroxyl groups in phenolics played a central role in their antioxidant capacity. Based on the finding, tannic acid showed the most effective antioxidant potential, e.g., 76% in tannic acid versus 22% in vitamin C as a standard antioxidant component. Because cancer progression is closely related to oxidative processes at the cellular level, we further applied the surface treatment of tannic acid drug-delivery nanocarriers. Tannic acid-loaded nanocarriers reduced reactive oxygen species of cancer cells as much as 41% of vehicle treatment and remodeled cytoskeletal network. By a gelatin degradation study, TA-loaded nanocarrier-treated cells induced 44.6% reduction of degraded area than vehicle-treated cells, implying a potential of blocking invasiveness of cancer cells.

Topics: Antioxidants; Neoplasms; Oxidation-Reduction; Phenols; Reactive Oxygen Species; Tannins

Owing to having a unique mechanism to kill cancer cells via the membrane accumulation of lipid peroxide (LPO) and the downregulation of glutathione peroxidase-4 (GPX-4), the ferroptosis therapy (FT) of tumors based on the Fenton reaction of iron nanoparticles has been receiving much attention in the past decade; however, there are some hurdles including the uncontrollable release of iron ions, slower kinetics of the intracellular Fenton reaction, and poor efficacy of FT that need to be overcome. Considering cooperative coordination of a multivalent thiol-pendant polypeptide ligand with iron ions, we put forward a facile strategy for constructing the iron-coordinated nanohybrid of methacryloyloxyethyl phosphorylcholine-grafted polycysteine/iron ions/tannic acid (i.e., PCFT), which could deliver a higher concentration of iron ions into cells. The dynamic and unsaturated coordination in PCFT is favorable for the intracellular stimuli-triggered release and fast Fenton reaction to realize efficient FT, while its intrinsic photothermia would boost the Fenton reaction to induce a synergistic effect between FT and photothermal therapy (PTT). Both immunofluorescence analyses of reactive oxygen species (ROS) and LPO confirmed that the intracellular Fenton reaction resulted in efficient FT, during which process the photothermia greatly boosted ferroptosis, and the Western blot assay corroborated that the expression level of GPX-4 was downregulated by FT and highly degraded by the photothermia to induce synergistic PTT-FT in vitro. Excitingly, by a single intravenous dose of PCFT plus one NIR irradiation, in vivo PTT-FT treatment completely eradicated 4T1 tumors without skin scar and tumor recurrence for 16 days, demonstrating prominent antitumor efficacy, as evidenced by the GPX-4, H&E, and TUNEL assays.

Topics: Cell Line, Tumor; Ferroptosis; Humans; Hyperthermia, Induced; Iron; Nanoparticles; Neoplasms; Peptides; Photothermal Therapy; Tannins

Combined treatment of immunotherapy and radiotherapy shows promising therapeutic effects for the regression of a variety of cancers. However, even multi-modality therapies often fail to antagonize the regression of large tumors due to the extremely immunosuppressive tumor microenvironment (TME). Here, a radioimmunotherapeutic paradigm based on stimulator of interferon genes (STING)-dependent signaling is applied to preclude large tumor progression by utilizing the metal-cyclic dinucleotide (CDN) nanoplatform, which integrates STING agonist c-di-AMP and immunomodulating microelement manganese (II) within the tannic acid nanostructure (TMA-NPs). As observed by magnetic resonance imaging, the localized administration of TMA-NPs effectively relieves hypoxia within TME and causes radical oxygen species overproduction and apoptosis in cancer cells after exposure to X-ray irradiation. The DNA fragments released from the apoptotic cells after the combined treatment augment the production of endogenous CDNs in cancer cells, hence significantly activating the STING-mediated pathway for stronger anti-tumor immunity. The localized therapy of TMA-NPs + X-ray not only inhibits the primary large tumor progression but also retards distant tumor growth by promoting dendritic cell maturation and activating cytotoxic immune cells whil suppressing immunosuppressive cells. Therefore, this work represents the combinatorial potency of TMA-NPs and X-rays on large tumor regression through strengthened STING-mediated radioimmunotherapeutics.

Topics: Humans; Immunotherapy; Interferons; Manganese; Membrane Proteins; Neoplasms; Oxygen; Radioimmunotherapy; Tannins; Tumor Microenvironment

Protein therapy has been considered to be one of the most direct and safe ways to regulate cell function and treat tumors. However, safe and effective intracellular delivery of protein drugs is still a key challenge. Herein, we developed a tannic acid-assisted biomineralization strategy for the encapsulation and intracellular delivery of protein drugs. RNase A and glucose oxidase (GOD) were choose as the protein drug model. RNase A, GOD, TA, and Mn

Topics: Biomineralization; Cell Line, Tumor; Glucose Oxidase; Humans; Nanoparticles; Neoplasms; Pharmaceutical Preparations; Ribonuclease, Pancreatic; Tannins; Tumor Microenvironment

Topics: Antineoplastic Agents; Cell Line, Tumor; Cell Membrane; Cell Proliferation; Cell Survival; Drug Carriers; Drug Delivery Systems; Drug Screening Assays, Antitumor; Gold; Humans; Magnetite Nanoparticles; Neoplasms; Particle Size; Tannins; Tetradecanoylphorbol Acetate

Curcumin (CUR) is a bioactive natural compound with potent antioxidant and anticancer properties. However, its poor water solubility has been a major limitation against its widespread clinical use. The aim of this study was to develop a nanoscale formulation for CUR to improve its solubility and potentially enhance its bioactivity, by leveraging the self-assembly behavior of tannic acid (TA) and amphiphilic poloxamers to form CUR-entrapped nanoassemblies. To optimize drug loading, formulation variables included the CUR: TA ratio and the type of amphiphilic polymer (Pluronic® F-127 or Pluronic® P-123). The optimal CUR nanoparticles (NPs) were around 200 nm in size with a high degree of monodispersity and 56% entrapment efficiency. Infrared spectroscopy confirmed the presence of intermolecular interactions between CUR and the NP formulation components. X-ray diffraction revealed that CUR was entrapped in the NPs in an amorphous state. The NPs maintained excellent colloidal stability under various conditions. In vitro release of CUR from the NPs showed a biphasic controlled release pattern up to 72 h. Antioxidant and antiproliferative assays against a panel of human cancer cell lines revealed significantly higher activity for CUR NPs compared to free CUR, particularly in MCF-7 and MDA-MB-231 breast cancer cells. This was attributed to greater cellular uptake of the NPs compared to the free drug as verified by confocal microscopy imaging and flow cytometry measurements. Our findings present a highly promising NP delivery platform for CUR prepared via a simple self-assembly process with the ability to potentiate its bioactivity in cancer and other diseases where oxidative stress is implicated.

Topics: Antineoplastic Agents; Curcumin; Humans; Nanoparticles; Neoplasms; Particle Size; Poloxamer; Tannins

The construction of enzyme delivery systems, which can control enzymatic activity at a target site, is important for efficient enzyme-prodrug therapy/diagnosis. Herein we report a facile technique to construct a systemically applicable β-galactosidase (β-Gal)-loaded ternary complex comprising tannic acid (TA) and phenylboronic acid-conjugated polymers through sequential self-assembly in aqueous solution. At physiological conditions, the ternary complex exhibited a hydrodynamic diameter of ∼40 nm and protected the loaded β-Gal from unfavorable degradation by proteinase. Upon cellular internalization, the ternary complex recovered β-Gal activity by releasing the loaded β-Gal. The intravenously injected ternary complex thereby delivered β-Gal to the target tumor in a subcutaneous tumor model and exerted enhanced and selective enzymatic activity at the tumor site. Sequential self-assembly with TA and phenylboronic acid-conjugated polymers may offer a novel approach for enzyme-prodrug theragnosis.

Topics: Animals; beta-Galactosidase; Boronic Acids; Cell Line, Tumor; Female; Hydrodynamics; Mice; Mice, Inbred BALB C; Models, Molecular; Molecular Structure; Nanoparticles; Neoplasms; Particle Size; Polymers; Surface Properties; Tannins

The majority of current methods of isolating circulating tumor cells (CTCs) rely on a biomarker. However, the isolation efficiency may be compromised due to the heterogeneity of CTCs. In this work, a simple and broad-spectrum method is established to efficiently isolate the heterogeneous CTCs from patient blood samples using tannic acid (TA)-functionalized magnetic nanoparticles (MNPs). The TA-functionalized MNPs (MNPs-TA) inhibit the nonspecific adhesion of peripheral blood mononuclear cell (PBMC) and enhance cancer cell capture, resulting from the unique interaction between TA and glycocalyx on cancer cells. The MNPs-TA was demonstrated to effectively capture seven kinds of cancer cells (HeLa, PC-3, T24, MAD-MB-231, MCF-7, HT1080, A549) from artificial samples (62.3-93.7%). Moreover, this epithelial cell adhesion molecule (EpCAM)-independent CTC isolation method was also tested using clinical blood samples from patients with different cancers (21 patients), which may provide a universal tool to detect CTCs in the clinic.

Topics: Adult; Aged; Cell Line, Tumor; Cell Separation; Epithelial Cell Adhesion Molecule; Female; Humans; Magnets; Male; Middle Aged; Nanoparticles; Neoplasms; Neoplastic Cells, Circulating; Tannins

This study was aimed towards the development of a novel microfluidic approach for the preparation of (co)polymeric and hybrid nanoparticles (NPs) composed of (co)polymers/tannic acid (TA) in the microfluidic flow-focusing glass-capillary device. The MiliQ water was used as water phase, whereas the organic phase was composed of poly(ε-caprolactone) (PCL) and poly(trimethylene carbonate) (PTMC) homopolymers and (co)polymers with different proportion of comonomers which were prepared via enzymatic polymerization that allows avoiding the usage of potentially toxic catalyst. To prepare hybrid NPs, TA was additionally added to the organic phase. Subsequently, as a result of mixing between these distinct phases in microfluidic channels, the nanoprecipitation in the form of spherical NPs occurs. The size of NPs was tuned over the range of 140-230 nm by controlling phase flow rates and the composition of NPs. Moreover, the release studies of the encapsulated anticancer drug doxorubicin (DOX) demonstrated that the drug release is greatly influenced by the (co)polymers composition, their molecular weight, NPs size, and the presence of TA. The antitumor activities of the (co)polymeric and hybrid NPs toward breast cancer cells (MCF-7) were tested in vitro. Among all tested formulation, the NPs composed of PCL/TA most efficiently inhibit the cell proliferation of MCF-7 cells, most importantly, their efficiency was higher than free DOX. The proposed strategy may provide an efficient alternative for the construction of nanocarriers with great potential in anticancer therapy.

Topics: Doxorubicin; Humans; Microfluidics; Nanoparticles; Neoplasms; Polyesters; Polymers; Tannins

Photothermal therapy (PTT) is able to ablate tumors

Topics: Animals; Cell Line, Tumor; Hyperthermia, Induced; Immunotherapy; Nanoparticles; Neoplasms; Phototherapy; Tannins

Numerous nanocarriers with pH-responsive properties have been designed and fabricated to reduce the adverse side effects of traditional chemotherapeutics, but these traditional nanocarriers are rarely reversible; this may cause "secondary" side effects on normal tissues, because the nanocarriers cannot be sealed again to prevent the leakage of incompletely released drugs after re-entering blood circulation. To overcome these limitations, we report herein the synthesis of a reversibly pH-responsive drug delivery system, which can achieve regulated drug release in a "release-stop-release" manner corresponding to changes in pH. Specifically, poly(tannic acid) as the "gatekeeper" was firstly deposited and polymerized on the surface of mesoporous silica nanoparticles (MSNs) via a modified mussel-inspired method similar to dopamine, and the formed polymer shell can be easily decorated with a targeting ligand HER2 antibody for the selective delivery of drugs to specific cells. The resulting nanocomposites exhibited good colloidal stability, good biocompatibility, high drug loading capacity and accurate HER2 antibody mediated targeting ability. Interestingly, a series of experiments fully demonstrated that the fabricated nanocomposites possessed intelligent reversible pH-responsive controlled release behavior through adjusting the density of the "gatekeeper" under different pH conditions, thereby achieving reversible switching from "on" to "off". Furthermore, in vitro and in vivo experiments verified that the fabricated targeting nanoparticles could efficiently inhibit tumor growth with minimal side effects. Meanwhile, these nanocarriers exhibited excellent reusability, in vitro cytotoxicity and minimal in vivo myocardial damage. Collectively, the reversible pH-operated nanovalve on the MSNs constructed here could serve as a nanoplatform to solve the problem of "secondary" side effects caused by residual drugs in irreversible "gatekeeper" systems.

Topics: Animals; Antibodies, Immobilized; Antineoplastic Agents; Cell Line, Tumor; Doxorubicin; Drug Carriers; Drug Liberation; Female; Humans; Hydrogen-Ion Concentration; Mice, Inbred BALB C; Mice, Nude; Nanoparticles; Neoplasms; Polymers; Receptor, ErbB-2; Silicon Dioxide; Tannins; Xenograft Model Antitumor Assays

Amino acids are the fundamental building blocks of proteins in tumor cells. The consumption of amino acid can be an effective approach for destroying the tumor cytoskeleton and malfunctioning of the intracellular metabolic balance. Following this concept, herein, amino acid oxidase (AAO) is delivered by hollow Fe3+/tannic acid nanocapsules (HFe-TA) and incorporated within the cancer cell membrane (M) for the first time for synergistic tumor therapy. In this system (M@AAO@HFe-TA), the intracellularly delivered AAO molecules catalyze the oxidative deamination effectively and consume amino acids significantly. The upregulation of intracellular acid and H2O2 concentration facilitates the HFe-TA mediated Fenton reaction and enhances the induction of cytotoxic ˙OH. With the combined effects, considerable in vitro and in vivo tumor inhibition was achieved by M@AAO@Fe-TA due to the activated Bcl-2/Bax/Cyt C/caspase 3 mitochondrial apoptotic pathway. This study offers an alternative therapeutic platform, functioning as a biomimetic cascade nanozyme, to enable synergistic starvation and chemodynamic tumor therapy with high efficacy.

Topics: Animals; Antineoplastic Agents; Cell Line, Tumor; Cell Membrane; Drug Carriers; Female; Hydrogen Peroxide; Iron; L-Amino Acid Oxidase; Mice, Inbred BALB C; Nanocapsules; Neoplasms; Tannins

A group of chemotherapeutic drugs has gained increasing interest in cancer immunotherapy due to the potential to induce immunogenic cell death (ICD). A critical challenge in using the ICD inducers in cancer immunotherapy is the immunotoxicity accompanying their antiproliferative effects. To alleviate this, a nanocapsule formulation of carfilzomib (CFZ), an ICD-inducing proteasome inhibitor, was developed using interfacial supramolecular assembly of tannic acid (TA) and iron, supplemented with albumin coating. The albumin-coated CFZ nanocapsules (CFZ-pTA-alb) attenuated CFZ release, reducing toxicity to immune cells. Moreover, due to the adhesive nature of the TA assembly, CFZ-pTA-alb served as a reservoir of damage-associated molecular patterns released from dying tumor cells to activate dendritic cells. Upon intratumoral administration, CFZ-pTA-alb prolonged tumor retention of CFZ and showed consistently greater antitumor effects than cyclodextrin-solubilized CFZ (CFZ-CD) in B16F10 and CT26 tumor models. Unlike CFZ-CD, the locally injected CFZ-pTA-alb protected or enhanced CD8

Topics: Animals; Antineoplastic Agents; Cell Line, Tumor; Delayed-Action Preparations; Humans; Immunity; Immunogenic Cell Death; Mice; Mice, Inbred C57BL; Nanocapsules; Neoplasms; Oligopeptides; Tannins

Nanoengineering of hydrophobic photosensitizers (PSs) is a promising approach for improved tumor delivery and enhanced photodynamic therapy (PDT) efficiency. A variety of delivery carriers have been developed for tumor delivery of PSs through the enhanced permeation and retention (EPR) effect. However, a high-performance PS delivery system with minimum use of carrier materials with excellent biocompatibility is highly appreciated. In this work, we utilized the spatiotemporal interfacial adhesion and assembly of supramolecular coordination to achieve the nanoengineering of water-insoluble photosensitizer Chlorin e6 (Ce6). The hydrophobic Ce6 nanoparticles are well stabilized in a aqueous medium by the interfacially-assembled film due to the coordination polymerization of tannic acid (TA) and ferric iron (Fe(III)). The resulting Ce6@TA-Fe(III) complex nanoparticles (referenced as Ce6@TA-Fe(III) NPs) significantly improves the drug loading content (~65%) and have an average size of 60 nm. The Ce6@TA-Fe(III) NPs are almost non-emissive as the aggregated states, but they can light up after intracellular internalization, which thus realizes low dark toxicity and excellent phototoxicity under laser irradiation. The Ce6@TA-Fe(III) NPs prolong blood circulation, promote tumor-selective accumulation of PSs, and enhanced antitumor efficacy in comparison to the free-carrier Ce6 in vivo evaluation.

Topics: Animals; Cell Survival; Chlorophyllides; Drug Carriers; Female; Ferric Compounds; Humans; Lasers; MCF-7 Cells; Mice; Mice, Inbred BALB C; Mice, Nude; Microscopy, Confocal; Nanoparticles; Neoplasms; Particle Size; Photochemotherapy; Photosensitizing Agents; Porphyrins; Tannins; Water

Topics: Antineoplastic Agents, Phytogenic; Cell Line, Tumor; Cell Proliferation; Cornaceae; Drug Discovery; Humans; Hydrolyzable Tannins; Japan; Molecular Structure; Neoplasms; Osmolar Concentration; Plant Extracts; Plant Leaves; Sumoylation; Tannins

Punica granatum (family: Lythraceae) is mainly found in Iran, which is considered to be its primary centre of origin. Studies on pomegranate peel have revealed antioxidant, anti-inflammatory, anti- angiogenesis activities, with prevention of premature aging and reducing inflammation. In addition to this it is also useful in treating various diseases like diabetes, maintaining blood pressure and treatment of neoplasms such as prostate and breast cancer.. In this study we identified anti-cancer targets of active compounds like corilagin (tannins), quercetin (flavonoids) and pseudopelletierine (alkaloids) present in pomegranate peel by employing dual reverse screening and binding analysis.. The potent targets of the pomegranate peel were annotated by the PharmMapper and ReverseScreen 3D, then compared with targets identified from different Bioassay databases (NPACT and HIT's). Docking was then further employed using AutoDock pyrx and validated through discovery studio for studying molecular interactions.. A number of potent anti-cancerous targets were attained from the PharmMapper server according to their fit score and from ReverseScreen 3D server according to decreasing 3D scores.. The identified targets now need to be further validated through in vitro and in vivo studies.

Topics: Alkaloids; Antineoplastic Agents; Computer Simulation; Drug Discovery; Flavonoids; Fruit; Glucosides; Humans; Hydrolyzable Tannins; Lythraceae; Molecular Docking Simulation; Molecular Targeted Therapy; Neoplasms; Piperidines; Quercetin; Tannins

Blechnum orientale Linn. (Blechnaceae) is used ethnomedicinally for the treatment of various skin diseases, stomach pain, urinary bladder complaints and sterilization of women. The aim of the study was to evaluate antioxidant, anticancer and antibacterial activity of five solvent fractions obtained from the methanol extract of the leaves of Blechnum orientale Linn.. Five solvent fractions were obtained from the methanol extract of B. orientale through successive partitioning with petroleum ether, chloroform, ethyl acetate, butanol and water. Total phenolic content was assessed using Folin-Ciocalteu's method. The antioxidant activity was determined by measuring the scavenging activity of DPPH radicals. Cytotoxic activity was tested against four cancer cell lines and a non-malignant cell using MTT assay. Antibacterial activity was assessed using the disc diffusion and broth microdilution assays. Standard phytochemical screening tests for saponins, tannins, terpenoids, flavonoids and alkaloids were also conducted.. The ethyl acetate, butanol and water fractions possessed strong radical scavenging activity (IC50 8.6-13.0 microg/ml) and cytotoxic activity towards human colon cancer cell HT-29 (IC50 27.5-42.8 microg/ml). The three extracts were also effective against all Gram-positive bacteria tested: Bacillus cereus, Micrococcus luteus, methicillin-susceptible Staphylococcus aureus (MSSA), methicillin-resistant Staphylococcus aureus (MRSA) and Stapylococcus epidermidis(minimum inhibitory concentration MIC 15.6-250 mug/ml; minimum bactericidal concentration MBC 15.6-250 microg/ml). Phytochemical analysis revealed the presence of flavonoids, terpenoids and tannins. Ethyl acetate and butanol fractions showed highest total phenolic content (675-804 mg gallic acid equivalent/g).. The results indicate that this fern is a potential candidate to be used as an antioxidant agent, for colon cancer therapy and for treatment of MRSA infections and other MSSA/Gram-positive bacterial infectious diseases.

Topics: Adenocarcinoma; Anti-Bacterial Agents; Antineoplastic Agents, Phytogenic; Antioxidants; Biphenyl Compounds; Cell Line; Cell Line, Tumor; Colonic Neoplasms; Ferns; Flavonoids; Free Radical Scavengers; Gram-Positive Bacteria; Humans; Microbial Sensitivity Tests; Neoplasms; Phenols; Picrates; Plant Leaves; Tannins; Terpenes

An overwhelming body of research has now firmly established that the dietary intake of berry fruits has a positive and profound impact on human health, performance, and disease. Berry fruits, which are commercially cultivated and commonly consumed in fresh and processed forms in North America, include blackberry ( Rubus spp.), black raspberry ( Rubus occidentalis), blueberry ( Vaccinium corymbosum), cranberry (i.e., the American cranberry, Vaccinium macrocarpon, distinct from the European cranberry, V. oxycoccus), red raspberry ( Rubus idaeus) and strawberry ( Fragaria x ananassa). Other berry fruits, which are lesser known but consumed in the traditional diets of North American tribal communities, include chokecherry ( Prunus virginiana), highbush cranberry ( Viburnum trilobum), serviceberry ( Amelanchier alnifolia), and silver buffaloberry ( Shepherdia argentea). In addition, berry fruits such as arctic bramble ( Rubus articus), bilberries ( Vaccinuim myrtillus; also known as bog whortleberries), black currant ( Ribes nigrum), boysenberries ( Rubus spp.), cloudberries ( Rubus chamaemorus), crowberries ( Empetrum nigrum, E. hermaphroditum), elderberries ( Sambucus spp.), gooseberry ( Ribes uva-crispa), lingonberries ( Vaccinium vitis-idaea), loganberry ( Rubus loganobaccus), marionberries ( Rubus spp.), Rowan berries ( Sorbus spp.), and sea buckthorn ( Hippophae rhamnoides), are also popularly consumed in other parts of the world. Recently, there has also been a surge in the consumption of exotic "berry-type" fruits such as the pomegranate ( Punica granatum), goji berries ( Lycium barbarum; also known as wolfberry), mangosteen ( Garcinia mangostana), the Brazilian açaí berry ( Euterpe oleraceae), and the Chilean maqui berry ( Aristotelia chilensis). Given the wide consumption of berry fruits and their potential impact on human health and disease, conferences and symposia that target the latest scientific research (and, of equal importance, the dissemination of this information to the general public), on the chemistry and biological and physiological functions of these "superfoods" are necessary.

Topics: Blueberry Plants; Cardiovascular Diseases; Diet; Flavonoids; Fragaria; Fruit; Health Promotion; Humans; Lythraceae; Neoplasms; Obesity; Rosaceae; Tannins; Vaccinium macrocarpon

Tomatoes, which are consumed worldwide, contain abundant phenolics. The objective of this study was to understand the suppression effect of phenolics in fresh and heated tomatoes on the expression of cyclooxygenase 2 (COX-2). Both small and big tomatoes of fresh or heated (in boiling water for 30 min) treatments were used. Sephadex LH-20 gel was used to separate the noncondensed tannin containing and the condensed tannin containing fractions from the crude phenolic extracts of tomatoes. The condensed tannin containing fraction was rich in condensed tannins and simple phenolics. The noncondensed tannin containing fraction contained abundant nontannin flavans. This study explored the effect of tomato phenolic extracts on the regulation of 12-o-teradecanoylphorbol-13-acetate (TPA)-induced inflammatory responses in KB cells. HPLC showed that tomato phenolic profiles were similar between small and big tomatoes either by fresh or heated treatment. Fresh tomato extracts had 70.8 +/- 4.8% (mean +/- SD) noncondensed tannin containing polyphenols (6.68 +/- 0.09 mg/g dry weight), 27.4 +/- 6.9% condensed tannin containing polyphenols (3.52 +/- 0.24 mg/g dry weight), and 1.7 +/- 0.6% other residues. Instead, heated tomato had 53.3 +/- 4.3% noncondensed tannin containing polyphenols (2.70 +/- 0.20 mg/g dry weight), 24.2 +/- 1.7% condensed tannin containing polyphenols (7.37 +/- 0.03 mg/g dry weight), and 22.5 +/- 4.8% other residues. Cell studies showed that phenolic extracts of heated tomatoes resulted in increased suppression of COX-2 expression compared with that of fresh tomato. Noncondensed tannin containing fraction of fresh tomato greatly suppressed COX-2 expression (P < 0.05) that compared to the negative control, but both noncondensed tannin containing and condensed tannin containing fractions of heated tomatoes showed suppression on COX-2 expression. These results suggest that tomato phenolics may play an important role in the chemoprevention of cancer.

Topics: Adsorption; Analysis of Variance; Chromatography, High Pressure Liquid; Cyclooxygenase 2; Cyclooxygenase 2 Inhibitors; Food Handling; Hot Temperature; Humans; KB Cells; Neoplasms; Phenols; Proanthocyanidins; Solanum lycopersicum; Tannins

Gammadelta T cells are innate immune cells that participate in host responses against many pathogens and cancers. Recently, phosphoantigen-based drugs, capable of expanding gammadelta T cells in vivo, entered clinical trials with the goal of enhancing innate immune system functions. Potential shortcomings of these drugs include the induction of nonresponsiveness upon repeated use and the expansion of only the Vdelta2 subset of human gammadelta T cells. Vdelta1 T cells, the major tissue subset, are unaffected by phosphoantigen agonists. Using FACS-based assays, we screened primary bovine cells for novel gammadelta T cell agonists with activities not encompassed by the current treatments in an effort to realize the full therapeutic potential of gammadelta T cells. We identified gammadelta T cell agonists derived from the condensed tannin fractions of Uncaria tomentosa (Cat's Claw) and Malus domestica (apple). Based on superior potency, the apple extract was selected for detailed analyses on human cells. The apple extract was a potent agonist for both human Vdelta1 and Vdelta2 T cells and NK cells. Additionally, the extract greatly enhanced phosphoantigen-induced gammadelta T cell expansion. Our analyses suggest that a tannin-based drug may complement the phosphoantigen-based drugs, thereby enhancing the therapeutic potential of gammadelta T cells.

Topics: Animals; Cat's Claw; Cattle; Cell Division; Fruit; Humans; Interleukin-2 Receptor alpha Subunit; Killer Cells, Natural; Malus; Neoplasms; Plant Extracts; Receptors, Antigen, T-Cell, gamma-delta; T-Lymphocytes; Tannins; Up-Regulation

Several decades back ascorbic acid was proposed as an effective anticancer agent. However, this idea remained controversial and the mechanism of action unclear. In this paper, we show that ascorbic acid at a concentration reported to be achievable through high doses of oral consumption is capable of cytotoxic action against normal cells. Several antioxidants of both animal as well as plant origin including ascorbic acid also possess prooxidant properties. Copper is an essential component of chromatin and can take part in redox reactions. Previously we have proposed a mechanism for the cytotoxic action of plant antioxidants against cancer cells that involves mobilization of endogenous copper ions and the consequent generation of reactive oxygen species. Using human peripheral lymphocytes and Comet assay we show here that ascorbic acid is able to cause oxidative DNA breakage in normal cells at a concentration of 100-200 microM. Neocuproine, a Cu(I) specific sequestering agent inhibited DNA breakage in a dose dependent manner indicating that Cu(I) is an intermediate in the DNA cleavage reaction. The results are in support of our above hypothesis that involves events that lead to a prooxidant action by antioxidants. The results would support the idea that even a plasma concentration of around 200 microM. would be sufficient to cause pharmacological tumor cell death particularly when copper levels are elevated. This would account for the observation of several decades back by Pauling and co-workers where oral doses of ascorbic acid in gram quantities were found to be effective in treating some cancers.

Topics: Antineoplastic Agents; Antioxidants; Ascorbic Acid; Comet Assay; Copper; DNA Damage; Drug Screening Assays, Antitumor; Free Radical Scavengers; Humans; Hydrogen Peroxide; Lymphocytes; Neoplasms; Oxidants; Oxidation-Reduction; Phenanthrolines; Tannins

The designation as speaker of the XVIII Annual Conference "Karl Gaede", sponsored by the Asociación Venezolana de Bioquímica y Biología Molecular, provided me with the opportunity to revisit the path constructed in twenty five years of biochemical research. This path stretches from cancer chemotherapy to nutritional toxicology, following the elusive thread that interconnects the metabolic network buried in the ground of any biological process. This work summarizes experiences derived from the use of drugs, inhibitors and stimulators that act on specific enzymatic steps. As a metabolic artisan, I have used these tools to unveil the peculiarities and the inherent character that give continuity to the conductive thread across the whole biological universe.

Topics: 6-Aminonicotinamide; Animals; Enzyme Inhibitors; Gluconates; Glycolysis; Isothiuronium; Neoplasms; Nutritional Physiological Phenomena; Oryza; Rats; Retrospective Studies; Tannins; Toxicology

Topics: Analgesics; Anesthetics; Animals; Antineoplastic Agents; Arsenic; Griseofulvin; Histamine H1 Antagonists; Hormones; Humans; Hypnotics and Sedatives; Isoniazid; Neoplasm Transplantation; Neoplasms; Nitroso Compounds; Secologanin Tryptamine Alkaloids; Sweetening Agents; Tannins

Topics: Animals; Antibodies; Ascitic Fluid; Benz(a)Anthracenes; Breast Neoplasms; Cell Wall; Erythrocytes; Macrophages; Methylcholanthrene; Neoplasms; Rats; Streptococcus; Tannins

Topics: Arachis; Areca; Carcinogens; Kidney Neoplasms; Liver Neoplasms; Mouth Neoplasms; Neoplasms; Senecio; Tannins; Toxicology

Topics: Hemagglutination Tests; Humans; Neoplasms; Tannins

Topics: Animals; Humans; Neoplasms; Neoplasms, Experimental; Tannins

Topics: Animals; Humans; Neoplasms; Neoplasms, Experimental; Tannins

Topics: Animals; Carcinogens; Liver Neoplasms; Neoplasms; Rats; Tannins

Topics: Adenoma, Bile Duct; Animals; Bile Duct Neoplasms; Bile Ducts; Bile Ducts, Intrahepatic; Carcinoma, Hepatocellular; Humans; Liver; Liver Neoplasms; Neoplasms; Rats; Tannins

Topics: Glucose; Glycolysis; Humans; Neoplasms; Tannins