title: [Effect of methylcobalamin on methotrexate transport in normal and tumorous tissues].
abstract: The effect of methylcobalamin on 3H-methotrexate uptake by tumor and normal tissues of mice with mammary adenocarcinoma (Ca-755) was studied. Methylcobalamin stimulated the rate of 3H-methotrexate influx into the tumor and small intestine but did not change its influx into the spleen. The effect was dependent on the dose of methylcobalamin. Comparative analysis of the kinetic differences in 3H-methotrexate influx and efflux in tumor and susceptible host tissues revealed the optimal dose of methylcobalamin 0.01 mg/kg to improve the antitumor drug action.
mesh_terms: D000230:Adenocarcinoma / Q000188:drug therapy / Q000378:metabolism*; D000818:Animals; D001692:Biological Transport / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D004353:Drug Evaluation, Preclinical; D004357:Drug Synergism; D005260:Female; D007421:Intestine, Small / Q000378:metabolism; D007700:Kinetics; D008325:Mammary Neoplasms, Experimental / Q000188:drug therapy / Q000378:metabolism*; D008727:Methotrexate / Q000378:metabolism* / Q000627:therapeutic use; D051379:Mice; D008810:Mice, Inbred C57BL; D009368:Neoplasm Transplantation; D013154:Spleen / Q000378:metabolism; D014805:Vitamin B 12 / Q000031:analogs & derivatives* / Q000627:therapeutic use
chemical_list: C019476:mecobalamin; D014805:Vitamin B 12; D008727:Methotrexate
vernacular_title: Vliianie metilkobalamina na transport metotreksata v normal'nye i opukholevye tkani.