Disruption of the VAPB-PTPIP51 ER-mitochondria tethering proteins in post-mortem human amyotrophic lateral sclerosis.

Disruption of the VAPB-PTPIP51 ER-mitochondria tethering proteins in post-mortem human amyotrophic lateral sclerosis.
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DOI:
10.3389/fcell.2022.950767
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发表时间:
2022
影响因子:
5.5
通讯作者:
--
中科院分区:
生物学2区
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内质网(ER)和线粒体之间的信号调节许多神经元的功能,在肌萎缩侧索硬化症(ALS)和扰动ER-线粒体信号被视为ALS的细胞和转基因模型。然而,目前几乎没有证据表明ER-线粒体信号在人类ALS中发生了改变。ER-线粒体信号传导由整合的ER蛋白VAPB和线粒体外膜蛋白PTPIP 51之间的相互作用介导,所述相互作用用于将ER的区域募集和“拴系”到线粒体表面。现在已知VAPB-PTPI 51系链调节许多ER-线粒体信号传导功能。这些包括将Ca 2+从ER商店递送到线粒体、线粒体ATP产生、自噬和突触活性。在这里,我们研究了VAPB-PTPIP 51栓系在死后控制和ALS脊髓。我们发现VAPB蛋白水平在ALS中降低。然后使用邻位连接测定来量化对照和ALS病例中脊髓运动神经元中的VAPB-PTPIP 51相互作用。这些研究表明,VAPB-PTPIP 51系链在ALS中被破坏。因此,我们确定了一个新的致病事件在死后ALS。
Signaling between the endoplasmic reticulum (ER) and mitochondria regulates many neuronal functions that are perturbed in amyotrophic lateral sclerosis (ALS) and perturbation to ER-mitochondria signaling is seen in cell and transgenic models of ALS. However, there is currently little evidence that ER-mitochondria signaling is altered in human ALS. ER-mitochondria signaling is mediated by interactions between the integral ER protein VAPB and the outer mitochondrial membrane protein PTPIP51 which act to recruit and “tether” regions of ER to the mitochondrial surface. The VAPB-PTPI51 tethers are now known to regulate a number of ER-mitochondria signaling functions. These include delivery of Ca2+ from ER stores to mitochondria, mitochondrial ATP production, autophagy and synaptic activity. Here we investigate the VAPB-PTPIP51 tethers in post-mortem control and ALS spinal cords. We show that VAPB protein levels are reduced in ALS. Proximity ligation assays were then used to quantify the VAPB-PTPIP51 interaction in spinal cord motor neurons in control and ALS cases. These studies revealed that the VAPB-PTPIP51 tethers are disrupted in ALS. Thus, we identify a new pathogenic event in post-mortem ALS.
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