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机构地区:[1]上海中医药大学中药研究所中药标准化教育部重点实验室,中药新资源与质量标准综合评价国家中医药管理局重点研究室,上海市复方中药重点实验室,上海201203
出 处:《中国药理学通报》2014年第4期546-549,共4页Chinese Pharmacological Bulletin
基 金:国家自然科学基金优秀青年基金资助项目(No 81322053);教育部新世纪优秀人才计划(No NCET-11-1054)
摘 要:目的研究黄芩素(Baicalein,BAI)对核转录因子Nuclear factor erythroid 2-related factor 2(Nrf2)的转录激活,以及对四氯化碳(carbon tetrachloride,CCl4)、乙醇(ethanol)和对乙酰氨基酚(acetaminophen,APAP)诱导的人正常肝L-02细胞毒性的拮抗作用。方法在肝L-02细胞中,采用瞬时转染报告基因实验检测不同浓度黄芩素对Nrf2转录激活的影响。在L-02细胞上分别用APAP(10 mmol·L-1)、CCl4(10 mmol·L-1)、Ethanol(100 mmol·L-1)诱导肝细胞毒性。黄芩素1、10、25、50、100μmol·L-1分别与细胞预孵15 min后,加入上述肝毒性物质,48 h后采用MTT法检测细胞存活率。结果与对照组比较,黄芩素(25、50μmol·L-1)能明显提高Nrf2的转录激活(P<0.01,P<0.05)。与对照组比较,3种肝毒性物质均能明显降低细胞存活率(P<0.01),而黄芩素能剂量依赖性地提高给予APAP、CCl4和Ethanol后降低的L-02细胞存活率(P<0.01)。结论黄芩素可以诱导重要的抗氧化核转录因子Nrf2的转录激活,这可能是黄芩素拮抗外源性肝毒性物质APAP、CCl4和Ethanol诱导的L-02肝细胞毒性的机制之一。Aim To study the activation of Nrf2 in-duced by baicalein ( BAI ) , and its protection against carbon tetrachloride ( CCl4 ) , ethanol and acetamino-phen ( APAP )-induced hepatotoxicity. Methods A reporter gene assay was conducted in human normal liver L-02 cells to detect the activation of transcription factor Nrf2 induced by baicalein. APAP ( 10 mmol &#183; L-1 ) , CCl4 (10 mmol&#183;L-1 ) and Ethanol (100 mmol &#183; L-1 ) were used to induce hepatotoxicity in L-02 cells. After the pre-incubation with Baicalein (0, 1, 10, 25, 50, 100 μmol&#183;L-1 ) for 15 min, cells were administrated with or without those above hepatotoxins. 48 h later, cell viability was detected by 3-(4, 5-dim-ethylthiazol-2-yl ) 2 , 5-diphenyltetrazolium bromide&amp;nbsp;(MTT) method. Results Baicalein (25, 50 μmol&#183; L-1 ) induced the activation of Nrf2 ( P &lt;0. 01 , P &lt;0. 05) in the reporter gene assay. As compared with control, three hepatotoxins ( APAP, CCl4 , Ethanol ) all decreased cell viability ( P&lt;0. 01 ) , and baicalein significantly reversed such decreases in a concentra-tion-dependent manner ( P&lt;0. 01 ) . Conclusion Ba-icalein can induce the activation of transcription factor Nrf2 , which is probably one of the mechanisms con-tributing to the protection of baicalein against hepato-toxins (APAP, CCl4, Ethanol)-induced hepatotoxici-ty.
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