chlorophyll-a has been researched along with Stomach-Neoplasms* in 3 studies
1 review(s) available for chlorophyll-a and Stomach-Neoplasms
1 trial(s) available for chlorophyll-a and Stomach-Neoplasms
2 other study(ies) available for chlorophyll-a and Stomach-Neoplasms
Article | Year |
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Folate-modified PLGA nanoparticles for tumor-targeted delivery of pheophorbide a in vivo.
Targeted drug delivery has been an important issue for tumor therapy including photodynamic therapy (PDT). The purpose of our study is to increase the targeting efficiency of photosensitizer (PS) using folate-modified nanoparticles (NPs) to tumor site in vivo. Folate receptor is over-expressed on the surface of many human cancer cells. We prepared poly (lactic-co-glycolic acid) (PLGA) NPs containing pheophorbide a (Pba), a PS that is used in PDT and generates free radical for killing cancer cells. The surface of NPs was composed of phospholipids modified with polyethylene glycol (PEG) and folate (FA). The size of the resulting FA-PLGA-Pba NPs was about 200 nm in PBS at pH 7.4 and they were stable for long time. They showed faster cellular uptake to MKN28 human gastric cancer cell line than control PLGA-Pba NPs by high-affinity binding with folate receptors on cell surface. In MTT assay, FA-PLGA-Pba NPs also showed enhanced tumor cell killing compared to control PLGA-Pba NPs. In vivo and ex vivo imaging showed high accumulation of FA-PLGA-Pba NPs in tumor site during 24 h after intravenous injection to MKN28 tumor-bearing mice model. These results demonstrate that our FA-PLGA-Pba NPs are useful for tumor-targeted delivery of PS for cancer treatment by PDT. Topics: Animals; Cell Line, Tumor; Chlorophyll; Drug Carriers; Drug Delivery Systems; Folic Acid; Humans; Lactic Acid; Mice, Nude; Nanoparticles; Photochemotherapy; Photosensitizing Agents; Polyglycolic Acid; Polylactic Acid-Polyglycolic Acid Copolymer; Stomach Neoplasms | 2018 |
Dietary N-nitroso compounds, endogenous nitrosation, and the risk of esophageal and gastric cancer subtypes in the Netherlands Cohort Study.
Dietary N-nitroso compounds and endogenous nitrosation are important carcinogenic factors, but human evidence of their role is scarce for esophageal cancer and inconsistent for gastric cancer.. We studied the relation between risks of esophageal and gastric cancer subtypes and dietary intake of N-nitrosodimethylamine, heme iron, nitrite, and nitrate in the Netherlands Cohort Study.. A total of 120,852 men and women aged 55-69 y were recruited in 1986, and diet, based on a 150-item food-frequency questionnaire, and other risk factors were assessed. The cohort was followed for 16.3 y, and 110 esophageal squamous cell carcinoma (ESCC), 151 esophageal adenocarcinoma, 166 gastric cardia adenocarcinoma, and 497 gastric noncardia adenocarcinoma (GNCA) cases were analyzed along with 4032 subcohort members in a case-cohort analysis.. Positive associations were observed between N-nitrosodimethylamine intake and ESCC risk (HR for 0.1-μg/d increase in intake: 1.15; 95% CI: 1.05, 1.25; P-trend = 0.01 based on tertiles of intake) and GNCA risk (1.06; 95% CI: 1.01, 1.10; P-trend = 0.09) in men. ESCC risk was associated with nitrite intake (HR for 0.1-mg/d increase: 1.19; 95% CI: 1.05, 1.36; P-trend = 0.06) and heme-iron intake (HR for 1-mg/d increase: 1.83; 95% CI: 0.98, 3.39; P-trend = 0.03). Among women, exposure levels were lower, and we found no convincing positive associations.. These results suggest that N-nitroso compounds may influence the risk of ESCC in men, but there are no clear associations for other esophageal and gastric subtypes. Topics: Aged; Ascorbic Acid; Chlorophyll; Diet; Dimethylnitrosamine; Esophageal Neoplasms; Female; Follow-Up Studies; Humans; Iron, Dietary; Linear Models; Male; Middle Aged; Multivariate Analysis; Netherlands; Nitrates; Nitrites; Nitrosation; Prospective Studies; Risk Assessment; Risk Factors; Stomach Neoplasms; Surveys and Questionnaires | 2013 |