摘要
目的探讨沉默信息调节因子1(SIRT1)在丙戊酸对肝脏Hep G2细胞毒性中的作用。方法在Hep G2细胞中,丙戊酸(2 mmol·L-1)孵育6、12、24、48 h,或丙戊酸(0.5、1、2 mmol·L-1)分别孵育48 h,通过Western blot方法检测丙戊酸对SIRT1蛋白表达的影响;通过瞬时转染SIRT1表达质粒和si-SIRT1,采用SRB方法,观察对SIRT1基因进行过表达和抑制后,丙戊酸对Hep G2细胞毒性的改变情况。结果丙戊酸对SIRT1的表达有抑制作用,且具有时间和剂量依赖性。过表达SIRT1后,Hep G2细胞对丙戊酸的毒性敏感性下降,转染前后IC50分别为(4.025±0.47)、(10.87±1.50)mmol·L-1;而干扰SIRT1后,Hep G2细胞对丙戊酸的毒性敏感性增加,转染前后IC50分别为(1.938±0.16)、(0.663±0.05)mmol·L-1。结论丙戊酸可抑制SIRT1的蛋白表达,并且过表达SIRT1可拮抗丙戊酸对肝细胞的毒性作用。
Aim To detect the role of sirtuin1 ( SIRT1 ) in hepatotoxity caused by valproic acid ( VPA) . Methods The changes of SIRT1 expression of HepG2 cells were detected by Western blot. And then SIRT1 plasmid or siRNA was transfected to con-struct SIRT1 overexpressed or knocked-down HepG2 cells. Furthermore, SRB assays were taken to observe the changes of viability of these cells exposed to VPA. Results VPA suppressed SIRT1 expression in a time and dose-dependent manner. SIRT1 overexpression showed a protective effect to the cytotoxicity caused by VPA, and the IC50 before and after transfection was (4. 025 ± 0. 47) and (10. 87 ± 1. 50) mmol·L-1 re-spectively. Moreover, transfection of SIRT1 siRNA sensitized HepG2 cells to VPA, and the IC50 before and after transfection was (1. 938 ± 0. 16) and (0. 663 ± 0. 05) mmol·L^-1 respectively. Conclusion VPA suppressed SIRT1 expression in HepG2 cells and over-expression of SIRT1 could reduce cytotoxicity induced by VPA.
出处
《中国药理学通报》
CAS
CSCD
北大核心
2015年第1期31-34,共4页
Chinese Pharmacological Bulletin
基金
国家自然科学基金资助项目(No 81102886)
广东省医学科研基金资助项目(No B2012077)