Oridonin, a novel lysine acetyltransferases inhibitor, inhibits proliferation and induces apoptosis in gastric cancer cells through p53- and caspase-3-mediated mechanisms.

Oridonin, a novel lysine acetyltransferases inhibitor, inhibits proliferation and induces apoptosis in gastric cancer cells through p53- and caspase-3-mediated mechanisms.
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冬凌草甲素是一种新型赖氨酸乙酰转移酶抑制剂,通过 p53 和 caspase-3 介导的机制抑制胃癌细胞增殖并诱导细胞凋亡

DOI:
10.18632/oncotarget.8033
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发表时间:
2016-04-19
期刊:
影响因子:
--
通讯作者:
Wang YG
Wang YG
中科院分区:
其他
文献类型:
--
作者:
Shi M;Lu XJ;Zhang J;Diao H;Li G;Xu L;Wang T;Wei J;Meng W;Ma JL;Yu H;Wang YG

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赖氨酸乙酰化已被报道参与包括癌症在内的多种疾病的发病机制。在我们的筛选研究,以确定天然化合物与赖氨酸乙酰转移酶抑制剂(KATi)的活性,冬凌草甲素被发现具有多种乙酰转移酶,包括P300,GCN 5,Tip 60,和pCAF的乙酰转移酶抑制作用。在胃癌细胞中,冬凌草甲素处理以浓度依赖性方式抑制细胞增殖,下调p53下游基因的表达,而PFT-α抑制p53则逆转了冬凌草甲素的抗增殖作用。同时,冬凌草甲素还能诱导胃癌细胞凋亡,增加caspase-3和caspase-9活性,降低线粒体膜电位,并呈浓度依赖性。Ac-DEVD-CHO抑制Caspase-3可逆转冬凌草甲素的促凋亡作用。总之,我们的研究确定了冬凌草甲素作为一种新的KATi,并证明其在胃癌细胞中的肿瘤抑制作用,至少部分通过p53和caspase-3介导的机制。
Lysine acetylation has been reported to involve in the pathogenesis of multiple diseases including cancer. In our screening study to identify natural compounds with lysine acetyltransferase inhibitor (KATi) activity, oridonin was found to possess acetyltransferase-inhibitory effects on multiple acetyltransferases including P300, GCN5, Tip60, and pCAF. In gastric cancer cells, oridonin treatment inhibited cell proliferation in a concentration-dependent manner and down-regulated the expression of p53 downstream genes, whereas p53 inhibition by PFT-α reversed the antiproliferative effects of oridonin. Moreover, oridonin treatment induced cell apoptosis, increased the levels of activated caspase-3 and caspase-9, and decreased the mitochondrial membrane potential in gastric cancer cells in a concentration-dependent manner. Caspase-3 inhibition by Ac-DEVD-CHO reversed the proapoptosis effect of oridonin. In conclusion, our study identified oridonin as a novel KATi and demonstrated its tumor suppressive effects in gastric cancer cells at least partially through p53-and caspase-3-mediated mechanisms.
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