The mitochondrial permeability transition pore is a dispensable element for mitochondrial calcium efflux.

The mitochondrial permeability transition pore is a dispensable element for mitochondrial calcium efflux.
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线粒体通透性过渡孔是线粒体钙外排的可分配元件。

DOI:
10.1016/j.ceca.2014.03.004
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发表时间:
2014-07
期刊:
影响因子:
4
通讯作者:
Pinton P
Pinton P
中科院分区:
生物学2区
文献类型:
--
作者:
De Marchi E;Bonora M;Giorgi C;Pinton P

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线粒体通透性过渡孔(mPTP)一直被认为在病理条件下的线粒体钙(Ca2+)稳态中发挥作用,作为线粒体通透性过渡和随后细胞死亡机制激活的中介。然而,其在线粒体Ca2+稳态中的作用尚不清楚。几项基于PPIF抑制或敲除的研究表明,mPTP参与Ca2+外排机制,而其他观察结果显示相反的结果。线粒体F1/FO ATP合成酶的c亚基最近被发现是mPTP的一个基本组成部分。在这项工作中,我们重点研究了mPTP通过调节c亚基的表达在Ca2+外排机制中的作用。我们观察到强迫mPTP打开或关闭不会损害线粒体Ca2+外排。因此,我们的研究结果强烈表明,mPTP在HeLa细胞的生理背景下不参与线粒体Ca2+稳态。
The mitochondrial permeability transition pore (mPTP) has long been known to have a role in mitochondrial calcium (Ca2+) homeostasis under pathological conditions as a mediator of the mitochondrial permeability transition and the activation of the consequent cell death mechanism. However, its role in the context of mitochondrial Ca2+ homeostasis is not yet clear. Several studies that were based on PPIF inhibition or knock out suggested that mPTP is involved in the Ca2+ efflux mechanism, while other observations have revealed the opposite result. The c subunit of the mitochondrial F1/FO ATP synthase has been recently found to be a fundamental component of the mPTP. In this work, we focused on the contribution of the mPTP in the Ca2+ efflux mechanism by modulating the expression of the c subunit. We observed that forcing mPTP opening or closing did not impair mitochondrial Ca2+ efflux. Therefore, our results strongly suggest that the mPTP does not participate in mitochondrial Ca2+ homeostasis in a physiological context in HeLa cells.
DOI: 10.4161/cc.23599
发表时间: 2013-02-15
期刊: CELL CYCLE
影响因子: 4.3
作者:
Bonora, Massimo;Bononi, Angela;Pinton, Paolo
通讯作者: Pinton, Paolo
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