维甲类化合物R8605的抗化学致癌和抗促癌作用

Anti-carcinogenic and Anti-promoting Effects of Retinoid R8605

本实验根据癌发生的多阶段理论,利用化学性诱发的小鼠二阶段皮肤乳头瘤模型。研究了维甲类化合物R8605的抗化学致癌和抗促癌作用。结果表明,R8605(50mg/kg和25mg/kg,口服)能明显抑制由二甲基苯蒽(DMBA)和巴豆油诱发的小鼠皮肤乳头瘤生成,并表现出较强的抗促癌作用;另外,R8605还能明显抑制巴豆油对小鼠皮肤表皮鸟氨酸脱羧酶(ODC)活性的诱导。R8605较大剂量(100mg/kg,口服)时,也能抑制巴豆油诱发的小鼠耳部肿胀。R8605的抗促癌作用可能与其抑制ODC活性及抗炎作用有一定的关系。

R8605 belongs to the third generation retinoid and was found during the systematic screening of cancer chemopreventive agents in our institute. Based on the theory of multistage carcinogenesis, the anti-carcinogenic and anti-promoting effects of R8605 as well as its possible anti-promoting mechanisms were studied. Experiments proved that R8605 (50 mg/kg and 25 mg/kg, i.g.) significantly inhibited the growth of skin papillomas induced by 7, 12-dime-thylbenz[a]anthracene and croton oil in mice and exhibited a potent anti-pro-moting action. In addition, R8605 (50 mg/kg and 25 mg/kg, i.g.) strongly inhibited the induction of ornithine decarboxylase (ODC) activity of mouse skin epidermis by croton oil.At a dose of 100 mg/kg of R8605 (i.g.) croton oil-induced ear edema in micewas suppressed. These results suggest that the anti-promoting effect of R8605 might be associated with its anti-inflammatory action and it's inhibitory effect on ODC activity.