Alternating metabolic pathways in NGF-deprived sympathetic neurons affect caspase-independent death.

Alternating metabolic pathways in NGF-deprived sympathetic neurons affect caspase-independent death.
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DOI:
10.1083/jcb.200302109
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发表时间:
2003-07-21
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Johnson EM Jr
Johnson EM Jr
中科院分区:
其他
文献类型:
--
作者:
Chang LK;Schmidt RE;Johnson EM Jr

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凋亡细胞的线粒体释放细胞色素c激活半胱天冬酶,导致凋亡细胞死亡。然而,最终导致caspase激活的事件本身可能具有有害影响,因为caspase抑制剂保存的细胞最终以caspase不依赖的方式死亡。为了确定什么事件可能导致这种形式的细胞死亡,我们检测了在广谱半胱天冬酶抑制剂boc-天冬氨酸-(OMe)-氟甲基酮存在下,被剥夺NGF的交感神经元的生物能量变化。在这里,我们报道了ngf缺失、boc-天冬氨酸-(OMe)-氟甲基酮保存的神经元严重依赖糖酵解来生成ATP和存活。其次,F0F1的活性有助于caspase非依赖性死亡,但在线粒体膜电位的维持中只起很小的作用,线粒体膜电位主要通过电子传递维持。第三,环孢素A抑制通透性过渡孔可减轻NGF剥夺引起的线粒体蛋白损失,提示通透性过渡孔开放可能在细胞色素c释放后调节线粒体降解。鉴定caspase抑制剂保存的细胞的变化可能为合理的策略提供基础,以增加线粒体后干预治疗的有效性。
Mitochondrial release of cytochrome c in apoptotic cells activates caspases, which execute apoptotic cell death. However, the events themselves that culminate in caspase activation can have deleterious effects because caspase inhibitor–saved cells ultimately die in a caspase-independent manner. To determine what events may underlie this form of cell death, we examined bioenergetic changes in sympathetic neurons deprived of NGF in the presence of a broad-spectrum caspase inhibitor, boc-aspartyl-(OMe)-fluoromethylketone. Here, we report that NGF-deprived, boc-aspartyl-(OMe)-fluoromethylketone–saved neurons rely heavily on glycolysis for ATP generation and for survival. Second, the activity of F0F1 contributes to caspase-independent death, but has only a minor role in the maintenance of mitochondrial membrane potential, which is maintained primarily by electron transport. Third, permeability transition pore inhibition by cyclosporin A attenuates NGF deprivation–induced loss of mitochondrial proteins, suggesting that permeability transition pore opening may have a function in regulating the degradation of mitochondria after cytochrome c release. Identification of changes in caspase inhibitor–saved cells may provide the basis for rational strategies to augment the effectiveness of the therapeutic use of postmitochondrial interventions.
Bax缺失进一步命令小脑颗粒细胞中的细胞死亡途径,并提出了与caspase无关的细胞死亡途径。
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