Action mechanism of anti-AH13 activity of 1,3-diaryl-1-nitrosoureas and related compounds.
作者:MICHIKO MIYAHARA、MAKOTO MIYAHARA、SHOZO KAMIYA
DOI:10.1248/cpb.32.564
日期:——
Administration of 1, 3-diaryl-1-nitrosoureas (I) prolonged the life span of rats inoculated intraperitoneally with ascites hepatoma AH13 cells. Active species produced from compound I were aryl diazonium ion, aryl isocyanate and nitrosonium ion. These species reacted with adenine, guanine, L-lysine, and the SH group of N-acetyl-DL-penicillamine. A possible anti-AH13 action mechanism of 1, 3-diaryl-1-nitrosoureas in proposed to be as follows. The nitrosoureas (I) permeate quickly into the cytoplasm or nucleus, and decompose to give an active intermediate, an aryl diazonium ion, which reacts with nucleic acids of tumor cells to form a deoxyribonucleic acid (DNA) adduct, followed by tumor cell death. DNA repair of other damaged cells is inhibited by aryl isocyanate and nitrosonium ion liberated from compound I, which reacts with repair enzyme to form carbamoylated and S-nitrosated enzyme.
1,3-二芳基-1-亚硝基脲(I)的给药延长了经腹腔注射腹水肝癌AH13细胞的大鼠的寿命。化合物I产生的活性物质为芳基重氮离子、芳基异氰酸酯和亚硝阳离子。这些物质与腺苷、鸟苷、L-赖氨酸以及N-乙 acetyl-DL-青霉胺的巯基反应。1,3-二芳基-1-亚硝基脲的可能抗AH13作用机制被提出如下:亚硝基脲(I)迅速渗透到细胞质或细胞核中,并分解产生活性中间体,即芳基重氮离子,与肿瘤细胞的核酸反应形成脱氧核糖核酸(DNA)加成物,从而导致肿瘤细胞死亡。释放自化合物I的芳基异氰酸酯和亚硝阳离子抑制其它受损细胞的DNA修复,它们与修复酶反应形成氨基甲酰化和S-亚硝基化的酶。