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IP3 receptor isoforms differently regulate ER-mitochondrial contacts and local calcium transfer.
Nature Communications ( IF 14.7 ) Pub Date : 2019-08-19 , DOI: 10.1038/s41467-019-11646-3
Adam Bartok 1, 2 , David Weaver 1 , Tünde Golenár 1 , Zuzana Nichtova 1 , Máté Katona 1 , Száva Bánsághi 1 , Kamil J Alzayady 3 , V Kaye Thomas 3 , Hideaki Ando 4, 5 , Katsuhiko Mikoshiba 4, 6 , Suresh K Joseph 1 , David I Yule 3 , György Csordás 1 , György Hajnóczky 1
Affiliation  

Contact sites of endoplasmic reticulum (ER) and mitochondria locally convey calcium signals between the IP3 receptors (IP3R) and the mitochondrial calcium uniporter, and are central to cell survival. It remains unclear whether IP3Rs also have a structural role in contact formation and whether the different IP3R isoforms have redundant functions. Using an IP3R-deficient cell model rescued with each of the three IP3R isoforms and an array of super-resolution and ultrastructural approaches we demonstrate that IP3Rs are required for maintaining ER-mitochondrial contacts. This role is independent of calcium fluxes. We also show that, while each isoform can support contacts, type 2 IP3R is the most effective in delivering calcium to the mitochondria. Thus, these studies reveal a non-canonical, structural role for the IP3Rs and direct attention towards the type 2 IP3R that was previously neglected in the context of ER-mitochondrial calcium signaling.

中文翻译:

IP3 受体亚型不同地调节 ER-线粒体接触和局部钙转移。

内质网 (ER) 和线粒体的接触位点在 IP3 受体 (IP3R) 和线粒体钙单向转运蛋白之间局部传递钙信号,对细胞存活至关重要。目前尚不清楚 IP3R 是否在接触形成中也具有结构性作用,以及不同的 IP3R 亚型是否具有冗余功能。使用用三种 IP3R 亚型和一系列超分辨率和超微结构方法拯救的 IP3R 缺陷细胞模型,我们证明维持 ER-线粒体接触需要 IP3R。这种作用与钙通量无关。我们还表明,虽然每种亚型都可以支持接触,但 2 型 IP3R 是将钙输送到线粒体的最有效方法。因此,这些研究揭示了一个非规范的、
更新日期:2019-08-19
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