摘要
目的研究组蛋白去乙酰化酶抑制剂曲古抑菌素A(trichostatinA,TSA)和帕比司他(panobinostat,LBH589)在体外对人肾癌细胞株增殖、细胞周期分布及凋亡的影响,并进一步探讨其可能的分子机制。方法 LBH589或TSA作用于经或未经SP600125预处理的人肾癌细胞株OS-RC-2,在设定的时间点用四甲基偶氮唑蓝方法(MTT)检测细胞生长抑制率并检测出最佳刺激浓度和时间;用流式细胞术检测药物作用后肾癌细胞周期变化情况及凋亡情况;用Western blotting分析药物作用后肾癌细胞内c-Jun、磷酸化c-Jun(p-c-Jun)、Bcl-2、Bax蛋白的表达变化。用JNK抑制剂SP600125阻断JNK信号通路后,观察SP600125预处理+TSA组较TSA单独处理肾癌细胞周期、凋亡及凋亡相关蛋白的变化情况。结果 TSA和LBH589在体外均可抑制肾癌细胞生长,且具有浓度与时间依赖性;与对照组相比,TSA或LBH589可使肾癌细胞发生G2/M期周期阻滞,并均可诱导肾癌细胞发生明显凋亡。Western blotting显示TSA和LBH589均能明显促进p-c-jun蛋白的表达,同时TSA也能诱导Bax蛋白表达而抑制Bcl2蛋白表达,与对照组相比有显著统计学意义(P<0.05);与TSA单独处理相比,JNK抑制剂SP600125预处理+TSA能部分减弱TSA对肾癌细胞的抑制效应并逆转TSA诱导的肾癌细胞G2/M期阻滞和细胞凋亡,差异有统计学意义(P<0.05)。结论组蛋白去乙酰化酶抑制剂在体外可抑制OS-RC-2细胞增殖,阻滞细胞周期、诱导细胞凋亡;TSA可通过JNK信号通路诱导OSRC-2细胞G2/M期阻滞,调节凋亡蛋白的表达从而诱导细胞凋亡。
Objective To study the effect of histone deacetylase inhibitors trichostatin A （TSA） and LBH589 on the growth of human renal cell carcinoma OS-RC-2 cells in vitro and explore the underlying molecular mechanism. Methods OS-RC-2 ceils were treated with LBH589 or TSA with or without SP600125 pretreatment, and the cell viability was measured by MTT assay. The changes of cell cycle distribution and apoptosis of OS-RC-2 cells were examined by flow cytometry, and the expressions of c-Jun, p-c-Jun, Bcl-2, and Bax were quantified by Western blotting. Results TSA and LBH589 both inhibited the growth of OS-RC-2 cells in a dose- and time-dependent manner. TSA at 1 gnmol/L and LBH589 at 50 nmol/L caused obvious cell cycle arrest in GdM phase and cell apoptosis, and significantly increased the protein levels of phosphorylated c-Jun. TSA treatment obviously increased Bax expression but decreased Bcl2 expression in the cells. The growth inhibitory effect of TSA was attenuated by the JNK inhibitor SP600125 in OS-RC-2 cells. TSA-induced phosphorylation of c-Jun and Bax upregulation was partially counteracted by SP600125. Conclusion TSA and LBH589 can cause cell cycle arrest and induce apoptosis in OS-RC-2 cells, in which process P-JNK pathway plays an important role.
出处
《南方医科大学学报》
CAS
CSCD
北大核心
2013年第10期1409-1415,共7页
Journal of Southern Medical University
基金
Supported by National Natural Science Foundation of China(81001109)
Research Scholar Project from Guangzhou Municipal Education Bureau(10A15G)
Research Fund for Doctoral Program of Higher Education of China(20094423110001)
Natural Science Foundation of Guangdong Province(s2011020002143)~~
