title: Differentiated inhibition of DNA, RNA and protein synthesis in L1210 cells by 8-methoxypsoralen.
abstract: The synthesis of DNA, RNA and protein was measured in L1210 cells following treatment with 8-methoxypsoralen in combination with long wavelength ultraviolet irradiation. The results show that the DNA synthesis is strongly inhibited (approximately 95%) at 200 ng/ml reaching a minimum within 2 hours while RNA synthesis is only weakly affected at this concentration (approximately 40% inhibition). At 2 micrograms/ml the RNA synthesis is inhibited approximately 90%. Even at this concentration only a moderate effect is seen on the protein synthesis. These results strongly indicate that the phototoxic action of 8-methoxypsoralen is primarily due to inhibition of DNA synthesis.
mesh_terms: D000818:Animals; D002478:Cells, Cultured; D004273:DNA, Neoplasm / Q000096:biosynthesis*; D007939:Leukemia L1210 / Q000378:metabolism*; D008730:Methoxsalen / Q000494:pharmacology*; D051379:Mice; D009363:Neoplasm Proteins / Q000096:biosynthesis*; D012334:RNA, Neoplasm / Q000096:biosynthesis*; D014466:Ultraviolet Rays
chemical_list: D004273:DNA, Neoplasm; D009363:Neoplasm Proteins; D012334:RNA, Neoplasm; D008730:Methoxsalen