[Analysis of macromolecule alkylation in tissues of intact and tumor carrying mice].
Alkylation DNA reparation kinetics and the disintegration of alkylated RNA, proteins and lipids in liver, spleen and brain of intact and 22A hepatomic mice after a injection of 1-14C-nitrosomethylurea at a therapeutic dose are studied. The tissue studied are different in their macromolecules and lipids alkylation, in DNA reparation and RNA, protein and lipid degradation rates. Possible correlation between the time of the occurrence of DNA damages and the frequency of tumour emergence in different tissues is discussed. It is found that normal cells eliminate more rapidly degraded RNA, protein and lipid molecules and more rapidly repair DNA damages as compared with 22A hepatoma cells. It is suggested to be due to more rapid macromolecule metabolism in normal cells which specifies a selective sensitivity of tumour cells to alkylating agents and nitrosoalkylureas. The time of the occurrence of damages induced with alkylating agents and nitrosomethylureas is supposed to be a critical parameter in processes resulting in the selective sensitivity of normal and tumour cells.
D000478:Alkylation; D000818:Animals; D001921:Brain / Q000378:metabolism*; D006528:Carcinoma, Hepatocellular / Q000378:metabolism*; D004260:DNA Repair; D050356:Lipid Metabolism; D008099:Liver / Q000378:metabolism*; D008113:Liver Neoplasms / Q000378:metabolism; D008770:Methylnitrosourea / Q000494:pharmacology; D051379:Mice; D009374:Neoplasms, Experimental / Q000378:metabolism; D011506:Proteins / Q000378:metabolism; D012313:RNA / Q000378:metabolism; D013154:Spleen / Q000378:metabolism*
D011506:Proteins; D012313:RNA; D008770:Methylnitrosourea
Analiz alkilirovaniia makromolekul v tkaniakh edorovykh mysheĭ i mysheĭ-opukholenositeleĭ