tretinoin has been researched along with Hemolysis* in 9 studies
1 review(s) available for tretinoin and Hemolysis
1 trial(s) available for tretinoin and Hemolysis
8 other study(ies) available for tretinoin and Hemolysis
Article | Year |
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Stimulation of Phospholipid Scrambling of the Erythrocyte Membrane by 9-Cis-Retinoic Acid.
The endogenous retinoid 9-cis-retinoic acid has previously been shown to trigger apoptosis in a wide variety of cells including several tumor cells and has thus been suggested for the treatment of malignancy. Similar to apoptosis of nucleated cells, erythrocytes may enter suicidal erythrocyte death or eryptosis, which is characterized by cell shrinkage and cell membrane scrambling with phosphatidylserine translocation to the erythrocyte surface. Cellular mechanisms participating in the accomplishment of eryptosis include increase of cytosolic Ca2+ activity ([Ca2+]i) and formation of ceramide. The present study explored, whether 9-cis-retinoic acid induces eryptosis and whether the effect involves Ca2+ and/or ceramide.. Flow cytometry was employed to estimate erythrocyte volume from forward scatter, phosphatidylserine exposure at the cell surface from annexin-V-binding, [Ca2+]i from Fluo3-fluorescence, and ceramide abundance utilizing specific antibodies. Hemolysis was quantified from hemoglobin concentration in the supernatant.. A 48 hours exposure of human erythrocytes to 9-cis-retinoic acid (≥ 0.5 µg/ml) significantly increased the percentage of annexin-V-binding cells and significantly decreased forward scatter. Exposure to 9-cis-retinoic acid (≥ 0.5 µg/ml) significantly increased Fluo3-fluorescence, and the effect of 9-cis-retinoic acid on annexin-V-binding was significantly blunted by removal of extracellular Ca2+. Exposure to 9-cis-retinoic acid (1 µg/ml) further significantly increased the ceramide abundance at the erythrocyte surface and significantly increased hemolysis.. 9-cis-retinoic acid triggers phospholipid scrambling of the erythrocyte cell membrane, an effect at least in part downstream of Ca2+ and ceramide. Topics: Alitretinoin; Calcium; Cell Size; Ceramides; Cytosol; Eryptosis; Erythrocyte Membrane; Erythrocytes; Hemoglobins; Hemolysis; Humans; Phosphatidylserines; Tretinoin | 2017 |
Polymeric nanoparticles based on chitooligosaccharide as drug carriers for co-delivery of all-trans-retinoic acid and paclitaxel.
An amphiphilic all-trans-retinoic acid (ATRA)-chitooligosaccharide (RCOS) conjugate was synthesized to form self-assembled polymeric nanoparticles to facilitate the co-delivery of ATRA and paclitaxel (PTX). The blank RCOS nanoparticles possessed low hemolytic activity and cytotoxicity, and could efficiently load PTX with a drug loading of 22.2% and a high encapsulation efficiency of 71.3%. PTX-loaded RCOS nanoparticles displayed a higher cytotoxicity to HepG2 cells compared to PTX plus ATRA solution when corrected by the accumulated drug release. Cellular uptake profiles of RCOS nanoparticles were evaluated via confocal laser scanning microscope and flow cytometry with FITC as a fluorescent mark. The RCOS nanoparticles could be rapidly and continuously taken up by HepG2 cells via endocytosis and transported into the nucleus, and the uptake rates increased with particle concentration. These results revealed the promising potential of RCOS nanoparticles as drug carriers for co-delivery of ATRA and PTX or other hydrophobic therapeutic agents. Topics: Animals; Cell Death; Chitin; Chitosan; Drug Carriers; Drug Delivery Systems; Endocytosis; Flow Cytometry; Fluorescein-5-isothiocyanate; Fluorescence; Hemolysis; Hep G2 Cells; Humans; Mice; Microscopy, Confocal; Nanoparticles; Oligosaccharides; Paclitaxel; Particle Size; Polymers; Proton Magnetic Resonance Spectroscopy; Rabbits; Spectroscopy, Fourier Transform Infrared; Static Electricity; Tretinoin | 2015 |
The pathogenesis of malaria: a new perspective.
With 3·3 billion people at risk of infection, malaria remains one of the world's most significant health problems. Increasing resistance of the main causative parasite to currently available drugs has created an urgent need to elucidate the pathogenesis of the disease in order to develop new treatments. A possible clue to such an understanding is that the malaria parasite Plasmodium falciparum selectively absorbs vitamin A from the host and appears to use it for its metabolism; serum vitamin A levels are also reduced in children with malaria. Although vitamin A is essential in low concentration for numerous biological functions, higher concentrations are cytotoxic and pro-oxidant, and potentially toxic quantities of the vitamin are stored in the liver. During their life cycle in the host the parasites remain in the liver for several days before invading the red blood cells (RBCs). The hypothesis proposed is that the parasites emerge from the liver packed with vitamin A and use retinoic acid (RA), the main biologically active metabolite of vitamin A, as a cell membrane destabilizer to invade the RBCs throughout the body. The characteristic hemolysis and anemia of malaria and other symptoms of the disease may thus be manifestations of an endogenous form of vitamin A intoxication associated with high concentrations of RA but low concentrations of retinol (ROL). Retinoic acid released from the parasites may also affect the fetus and cause preterm birth and fetal growth restriction (FGR) as a function of the membranolytic and growth inhibitory effects of these compounds, respectively. Subject to testing, the hypothesis suggests that parasite vitamin A metabolism could become a new target for the treatment and prevention of malaria. Topics: Anemia; Endocytosis; Erythrocytes; Hemolysis; Humans; Liver; Malaria, Falciparum; Plasmodium falciparum; Tretinoin; Vitamin A | 2013 |
Cancer targeting potential of folate targeted nanocarrier under comparative influence of tretinoin and dexamethasone.
The objective of this investigation was aimed to explore the cancer targeting potential of folate conjugated dendrimer (polypropylene imine, PPI) under strategic influence of folate receptor up-regulators (all trans Retinoic acid, ATRA and Dexamethasone, DEXA). The folate conjugated dendrimer nanoconjugate (FPPI) was synthesized and characterized by FTIR, and (1)H-NMR spectroscopy. The cell line studies investigations were performed on MCF-7 cells. ATRA and DEXA caused 2.17 and 1.65 folds selective up-regulation of folate receptor respectively, when compared with untreated control, after 48 h of pretreatment. ATRA caused 50.47±2.11% more up regulation of folate receptor, than DEXA treated cell. Both up regulators showed a lag phase of 12 h in up-regulating the folate receptors. After 48 h, the IC50 values of naked docetaxel (DTX) and DTX loaded dendrimer (PPI-DTX) were found to be 678.93±11.99 nM and 663.51±15.23 nM, respectively, while DTX loaded folate-anchored dendrimer (FPPI-DTX) showed a selectively lowered IC50 value of 468.56±20.86 nM. FPPI-DTX further showed a significant reduction in IC50 value in ATRA and DEXA pretreated cells, wherein IC50 values of 184.21 nM and 290.40±14.05 nM, respectively were observed. The study also concludes ATRA to be a superior receptor up-regulator as well as promoter of folate based targeting compared to DEXA. Topics: Cell Survival; Dendrimers; Dexamethasone; Erythrocytes; Folate Receptors, GPI-Anchored; Folic Acid; Hemolysis; Humans; MCF-7 Cells; Nanoparticles; Neoplasms; Polypropylenes; Tretinoin | 2013 |
Efficient simultaneous tumor targeting delivery of all-trans retinoid acid and Paclitaxel based on hyaluronic acid-based multifunctional nanocarrier.
An amphiphilic hyaluronic acid (HA)-g-all-trans retinoid acid (HRA) conjugate was successfully developed as a tumor-targeting nanocarrier for potentially synergistic combination chemotherapy of all-trans retinoid acid (ATRA) and paclitaxel (PTX). The HRA conjugate was synthesized by an imine reaction between HA-COOH and ATRA-NH2. PTX-loaded HRA nanoparticles possessed a high loading capacity, nanoscale particle sizes, and good biocompatible characteristics. Cell viability assays indicated that PTX-loaded HRA nanoparticles exhibited concentration- and time-dependent cytotoxicity. Moreover, they displayed obvious superiority in inducing the apoptosis of tumor cells. Cellular uptake analysis suggested that HRA nanoparticles could be efficiently taken up by cells via endocytic pathway and transport into the nucleus, contributing to HA receptor-mediated endocytosis and ATRA-induced nuclear translocation, respectively. Moreover, in vivo imaging analysis indicated that the accumulation of DiR-loaded HRA nanoparticles in tumor was increased obviously after intravenous administration as compared to free DiR solution, which confirmed that the HRA nanoparticles could assist the drugs targeting to the tumor. Furthermore, PTX-loaded HRA nanoparticles exhibited greater tumor growth inhibition effect in vivo with reducing the toxicity. Therefore, HRA nanoparticles can be considered as a promising targeted codelivery system for combination cancer chemotherapy. Topics: Animals; Apoptosis; Cells, Cultured; Drug Carriers; Female; Flow Cytometry; Hemolysis; Hep G2 Cells; Humans; Hyaluronic Acid; Melanoma, Experimental; Mice; Mice, Inbred BALB C; Nanoparticles; Paclitaxel; Rabbits; Tretinoin | 2013 |
Altered chemical and biological activities of all-trans retinoic acid incorporated in solid lipid nanoparticle powders.
The principal aim of this study was to investigate whether the solid lipid nanoparticle (SLN) powder formulation of all-trans retinoic acid (ATRA) can favorably alter the chemical stability and biological activities of ATRA. SLN powder formulation of ATRA was obtained by freeze-drying of SLN dispersions. The chemical stability of ATRA was determined by HPLC analysis. The anticancer efficacy of ATRA was determined by evaluating antiproliferative effects of ATRA on cancer cell lines. Hemolytic potential of ATRA was spectrophotometrically determined after incubation with red blood cells (RBCs) in vitro. ATRA could be efficiently incorporated in SLN powder without impairing the physical stability of lipid nanoparticles. After 3 months of storage, >90% ATRA remained intact in SLN powder, indicating that the chemical stability of ATRA was substantially improved by incorporation in SLN powder. The antiproliferative effects of SLN powder formulation of ATRA on a wide range of cancer cell lines were not significantly different from that of free ATRA. Furthermore, the incorporation of ATRA in SLN powder significantly reduced the hemolytic potential of ATRA. Taken together, the molecular characteristics that currently appear to limit the clinical efficacy of ATRA were greatly improved by preparing SLN powder formulation. SLN powder formulation of ATRA may have a potential in enhancing the efficacy of ATRA in cancer chemoprevention and therapeutics. Topics: Animals; Antineoplastic Agents; Cell Line, Tumor; Drug Stability; Female; Hemolysis; Humans; Mice; Mice, Inbred BALB C; Nanostructures; Powders; Tretinoin | 2004 |
Intravascular haemolysis complicating treatment of acute promyelocytic leukaemia with all-trans retinoic acid (ATRA)
Topics: Acute Kidney Injury; Administration, Oral; Anemia, Hemolytic; Antineoplastic Agents; Australia; Dose-Response Relationship, Drug; Fatal Outcome; Hemolysis; Humans; Leukemia, Promyelocytic, Acute; Male; Middle Aged; Tretinoin | 1997 |
Cell fusion, haemolysis and mitochondrial swelling induced by retinol and derivatives.
A comparative study has been made of the abilities of retinol and its derivatives to induce cell fusion and haemolysis of hen erythrocytes and to cause swelling of rat liver mitochondria. Retinol, retinaldehyde, alpha-retinoic acid, iso-13-retinol and to a lesser extent retinyl acetate were active in all three systems. Iso-13-retinoic acid was extremely membranolytic but did not produce stable fused cells. By contrast retinoic acid, its cyclopentyl derivative RO8-7699, and the long chain fatty acid esters of retinol, viz. the oleate, linoleate and palmitate esters, were neither fusogenic nor haemolytic, nor did they affect mitochondria. Topics: Animals; Cell Fusion; Chickens; Erythrocytes; Hemolysis; Mitochondria, Liver; Mitochondrial Swelling; Rats; Retinaldehyde; Structure-Activity Relationship; Tretinoin; Vitamin A | 1980 |