Hexokinase II detachment from the mitochondria potentiates cisplatin induced cytotoxicity through a caspase-2 dependent mechanism.

Hexokinase II detachment from the mitochondria potentiates cisplatin induced cytotoxicity through a caspase-2 dependent mechanism.
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DOI:
10.4161/cc.8.20.9853
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发表时间:
2009-10-15
期刊:
Cell cycle (Georgetown, Tex.)
影响因子:
--
通讯作者:
Pastorino JG
Pastorino JG
中科院分区:
其他
文献类型:
--
作者:
Shulga N;Wilson-Smith R;Pastorino JG

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癌细胞通常是糖酵解的,并且过度表达己糖激酶II(HXK II)。在癌细胞中,大部分己糖激酶II通过与电压依赖性阴离子通道(VDAC)的相互作用定位于线粒体。已有研究表明,破坏己糖激酶II与线粒体的结合可促进促凋亡蛋白引起的线粒体损伤。本研究证实顺铂可诱导依赖于PIDD(具有死亡结构域的P53诱导蛋白)的caspase-2的激活。反过来,caspase-2裂解并激活Bid,导致Bak寡聚和细胞色素c的释放。值得注意的是,己糖激酶II从线粒体上分离显著加强了caspase-2诱导的线粒体损伤,从而协同诱导顺铂诱导的细胞毒性。
Cancer cells are frequently glycolytic and over-express hexokinase II (HXK II). In cancer cells, the majority of hexokinase II is localized to the mitochondria through interaction with the voltage dependent anion channel (VDAC). Disruption in the binding of hexokinase II to the mitochondria has been shown to promote mitochondrial injury provoked by pro-apoptotic proteins. The present study demonstrates that cisplatin induces the PIDD (P53 induced protein with a death domain) dependent activation of caspase-2. In turn, caspase-2 cleaves and activates Bid, resulting in the oligomerization of Bak and the release of cytochrome c. Notably, the detachment of hexokinase II from the mitochondria markedly potentiates the onset of caspase-2 induced mitochondrial damage, thus resulting in a synergistic induction of cisplatin induced cytotoxicity.
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