Lysosomal membrane permeabilization induces cell death in a mitochondrion-dependent fashion.

Lysosomal membrane permeabilization induces cell death in a mitochondrion-dependent fashion.
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溶酶体膜通透性以线粒体依赖性方式诱导细胞死亡。

DOI:
10.1084/jem.20021952
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发表时间:
2003-05-19
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Kroemer G
Kroemer G
中科院分区:
其他
文献类型:
--
作者:
Boya P;Andreau K;Poncet D;Zamzami N;Perfettini JL;Metivier D;Ojcius DM;Jäättelä M;Kroemer G

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许多疾病是由于溶酶体不稳定,导致破坏性细胞损失。为了研究溶酶体细胞死亡的机制,我们描述了两种广泛使用的喹诺酮类抗生素:环丙沙星(CPX)或诺氟沙星(NFX)的细胞毒性作用。CPX或NFX加紫外光(NFX*)诱导溶酶体膜透性(LMP),通过溶酶体释放组织蛋白酶来检测。抑制CPX或NFX的溶酶体积累会抑制它们诱导LMP和杀死细胞的能力。CPX或nfx触发的LMP导致caspase不依赖的细胞死亡,具有凋亡的特征,如染色质浓缩和质膜上的磷脂酰丝氨酸暴露。通过细胞色素c的释放检测,LMP触发线粒体膜透性(MMP)。CPX和NFX*均使Bax和Bak采用凋亡构象并插入线粒体膜。在CPX或nfx诱导的LMP中,Bax−/−Bak−/−双敲除细胞不发生MMP和细胞死亡。单敲除Bax或Bak(但不包括Bid)或转染强制表达线粒体靶向(但不包括内质网靶向)Bcl-2,对CPX(但不包括NFX*)诱导的MMP和死亡具有保护作用。总之,我们的数据表明,线粒体对于溶酶体失稳引发的细胞死亡是不可或缺的。
A number of diseases are due to lysosomal destabilization, which results in damaging cell loss. To investigate the mechanisms of lysosomal cell death, we characterized the cytotoxic action of two widely used quinolone antibiotics: ciprofloxacin (CPX) or norfloxacin (NFX). CPX or NFX plus UV light (NFX*) induce lysosomal membrane permeabilization (LMP), as detected by the release of cathepsins from lysosomes. Inhibition of the lysosomal accumulation of CPX or NFX suppresses their capacity to induce LMP and to kill cells. CPX- or NFX-triggered LMP results in caspase-independent cell death, with hallmarks of apoptosis such as chromatin condensation and phosphatidylserine exposure on the plasma membrane. LMP triggers mitochondrial membrane permeabilization (MMP), as detected by the release of cytochrome c. Both CPX and NFX* cause Bax and Bak to adopt their apoptotic conformation and to insert into mitochondrial membranes. Bax−/− Bak−/− double knockout cells fail to undergo MMP and cell death in response to CPX- or NFX-induced LMP. The single knockout of Bax or Bak (but not Bid) or the transfection-enforced expression of mitochondrion-targeted (but not endoplasmic reticulum–targeted) Bcl-2 conferred protection against CPX (but not NFX*)-induced MMP and death. Altogether, our data indicate that mitochondria are indispensable for cell death initiated by lysosomal destabilization.
DOI: 10.1083/jcb.200104008
发表时间: 2001-09-17
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