Valproic acid induces neuronal cell death through a novel calpain-dependent necroptosis pathway.

Valproic acid induces neuronal cell death through a novel calpain-dependent necroptosis pathway.
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丙戊酸通过一种新型的Calpain依赖性坏死途径诱导神经元细胞死亡。

DOI:
10.1111/jnc.13029
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发表时间:
2015-04
影响因子:
4.7
通讯作者:
Aurelian L
Aurelian L
中科院分区:
医学2区
文献类型:
--
作者:
Bollino D;Balan I;Aurelian L

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越来越多的证据表明,丙戊酸(VPA)是一种用于治疗癫痫和情绪障碍的组蛋白去乙酰化酶(HDAC)抑制剂,具有HDAC相关和非HDAC相关的神经毒性活性,其机制尚不清楚。我们报道,VPA通过一种非典型的Calain依赖的坏死下垂途径诱导神经细胞死亡,该途径始于c-jun氨基末端激酶1(JNK1)的下游激活和受体相互作用蛋白1(RIP-1)的表达增加,并伴随着凋亡诱导因子(AIF)的切割和线粒体释放/核转位,Smac/Diablo的线粒体释放,以及抗凋亡蛋白X连锁凋亡抑制物(XIAP)的抑制。与AIF核转位一致,VPA诱导与坏死性下垂相关的组蛋白H_2A家族成员H_2AX的磷酸化,这是已知的有助于致命性DNA降解的因素。这些信号在表达结构性激活的MEK/ERK和/或PI3-K/Akt生存通路的神经细胞中被抑制,使它们能够抵抗VPA诱导的细胞死亡。这些数据表明,VPA具有神经毒性活性,并发现了一种新的钙蛋白酶依赖的坏死性下垂途径,其中包括JNK1激活和RIP-1表达。
A growing body of evidence indicates that valproic acid (VPA), a histone deacetylase (HDAC) inhibitor used to treat epilepsy and mood disorders, has HDAC-related and -unrelated neurotoxic activity, the mechanism of which is still poorly understood. We report that VPA induces neuronal cell death through an atypical calpain-dependent necroptosis pathway that initiates with downstream activation of c-Jun N-terminal kinase 1 (JNK1) and increased expression of receptor-interacting protein 1 (RIP-1) and is accompanied by cleavage and mitochondrial release/nuclear translocation of apoptosis-inducing-factor (AIF), mitochondrial release of Smac/DIABLO, and inhibition of the anti-apoptotic protein X-linked inhibitor of apoptosis (XIAP). Coinciding with AIF nuclear translocation, VPA induces phosphorylation of the necroptosis-associated histone H2A family member H2AX, which is known to contribute to lethal DNA degradation. These signals are inhibited in neuronal cells that express constitutively activated MEK/ERK and/or PI3-K/Akt survival pathways, allowing them to resist VPA-induced cell death. The data indicate that VPA has neurotoxic activity and identify a novel calpain-dependent necroptosis pathway that includes JNK1 activation and RIP-1 expression.
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