title: Photochemically obtained N-demethyl derivatives of anthracyclines.
abstract: New N-monodemethyl and N-didemethyl derivatives were obtained from seven N-dimethylamino sugar (rhodosamine)-containing anthracyclines by photochemical reaction and their in vitro bioactivities against L1210 cell culture were compared with those of their N-dimethyl parent compounds. N-Demethyl derivatives obtained from betaclamycin T (7-O-rhodosaminyl-beta-rhodomycinone) were much more cytotoxic while those from the other six antibiotics were rather less active as compared with their parent compounds. The N-demethylation also gave a considerably greater decrease in the inhibitory activity on RNA synthesis as compared to DNA synthesis, so that the N-demethyl derivatives showed smaller IC50 ratios on DNA/RNA than their parent compounds.
authors: Central Research Laboratory, Mercian Corporation, Fujisawa, Japan.
authors: O
authors: O
authors: Johdo
authors: H
authors: H
authors: Tone
authors: R
authors: R
authors: Okamoto
authors: A
authors: A
authors: Yoshimoto
authors: H
authors: H
authors: Naganawa
authors: T
authors: T
authors: Sawa
authors: T
authors: T
authors: Takeuchi
mesh_terms: D000818:Animals; D018943:Anthracyclines; D000903:Antibiotics, Antineoplastic / Q000737:chemistry* / Q000494:pharmacology; D002851:Chromatography, High Pressure Liquid; D002855:Chromatography, Thin Layer; D004261:DNA Replication / Q000187:drug effects; D004273:DNA, Neoplasm / Q000187:drug effects; D007939:Leukemia L1210 / Q000188:drug therapy; D009682:Magnetic Resonance Spectroscopy; D008745:Methylation; D010777:Photochemistry; D012334:RNA, Neoplasm / Q000187:drug effects; D013329:Structure-Activity Relationship; D014407:Tumor Cells, Cultured
chemical_list: D018943:Anthracyclines; D000903:Antibiotics, Antineoplastic; D004273:DNA, Neoplasm; D012334:RNA, Neoplasm; C004977:rhodomycin