期刊
EUROPEAN JOURNAL OF NEUROSCIENCE
卷 33, 期 5, 页码 831-842出版社
WILEY
DOI: 10.1111/j.1460-9568.2010.07576.x
关键词
calcium homeostasis; cortical neurons; mitochondria; mutant mice; neurodegeneration neuroprotection
资金
- National Institutes of Health
- National Multiple Sclerosis Society
- Laura Fund for Innovation in Multiple Sclerosis Research
- Department of Veteran Affairs
- Nancy Davis Center Without Walls
- Oregon Brain Institute
- Tartar Trust
- Team Eugene
- St. Laurent Foundation of Vancouver, WA
- [P30-NS06180]
The participation of mitochondria in cellular and neuronal Ca2+ homeostatic networks is now well accepted. Yet, critical tests of specific mitochondrial pathways in neuronal Ca2+ responses have been hampered because the identity of mitochondrial proteins that must be integrated within this dynamic system remain uncertain. One putative pathway for Ca2+ efflux from mitochondria exists through the formation of the permeability transition pore (PTP) that is often associated with cellular and neuronal death. Here, we have evaluated neuronal Ca2+ dynamics and the PTP in single adult neurons in wild-type mice and those missing cyclophilin D (CyPD), a key regulator of the PTP. Using high-resolution time-lapse imaging, we demonstrate that PTP opening only follows simultaneous activation with two physiological stimuli that generate critical threshold levels of cytosolic and mitochondrial Ca2+. Our results are the first to demonstrate CyPD-dependent PTP opening in normal neuronal Ca2+ homeostatic mechanisms not leading to activation of cell death pathways. As neurons in mice lacking CyPD are protected in a number of neurodegenerative disease models, the results suggest that improved viability of CyPD-knockout animals in these pathological states may be due to the transient, rather than persistent, activation of the PTP in mutant mitochondria, thereby shielding neurons from cytoplasmic Ca2+ overload.
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