Involvement of miR-199a downregulation in the preventive effects of Jianpi Jiedu Recipe against experimental hepatocarcinoma in rats
- Author:
- No author available
- Journal Title:
- WORLD CHINESE JOURNAL OF DIGESTOLOGY
- Issue:
- 2
- DOI:
- 10.3969/j.issn.1009-3079.2010.02.004
- Key Word:
- 健脾解毒方;原发性肝癌;二乙基亚硝胺;大鼠;预防;微RNA
Abstract： 目的:探讨中药复方健脾解毒方对二乙基亚硝胺(DEN)诱导的大鼠肝癌的预防作用及其调控miR-199a的表达机制.方法:♂Wistar大鼠,随机分为正常组(n=25)、模型组(n=40)及中药预防组(n=40).除正常组外,其他组在1-12wk用含DEN 80 mg/L的饮水[mg/(kg·d)]以诱癌,中药组同时给予含生药1.75 g/mL的健脾解毒方灌胃(10 mL/kg),正常组给予10 mL/kg生理盐水灌胃,每日1次,共12wk.于4、8、12、16 wk时相点,各组随机取5只大鼠处死取肝,20 wk将剩余大鼠全部处死取肝,观察肝脏外观,计算死亡率和腹水生成率,比较肝脾指数,肝组织进行HE染色,应用Realtime PCR检测肝组织miR-199a的表达.结果:在20 wk实验结束时,正常大鼠无死亡,而模型大鼠死亡率为42.5%(17/40),预防组死亡率为17.5%(7/40),16.20 wk时模型组腹水发生率为87.5%(7/8),预防组为44.4%(8/18),与模型组有差异性(P<0.05).正常组没有肿瘤形成,模型组和预防组在16 wk后成瘤率均为100%.16 wk模型组肝癌Ⅲ级发生率为100%(5/5),而预防组Ⅰ、Ⅱ、Ⅲ级肝癌发生率分别为40%(2/5)、40%(2/5)及20%(1/5),两组比较有差异(P<0.05).与模型组比较,中药预防组有显著降低肝脾指数的作用(均P<0.01).PCR结果显示.模型组肝组织miR-199a较正常组明显上调,中药预防组除16 wk外均有显著下调miR-199a表达的作用(均P<0.01).结论:健脾解毒方有预防DEN诱导大鼠肝癌发生的作用,其机制可能部分与下调miR-199a的表达有关.
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