Segregated cation flux by TPC2 biases Ca(2+) signaling through lysosomes.

Segregated cation flux by TPC2 biases Ca(2+) signaling through lysosomes.
复制标题

TPC 2的分离阳离子通量通过溶酶体偏置Ca(2+)信号传导。

DOI:
10.1038/s41467-022-31959-0
复制
发表时间:
2022-08-02
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
文献类型:
--
作者:

文献摘要

参考文献

被引文献

相似文献

双孔通道是具有延展性选择性过滤器的内溶酶体阳离子通道,可驱动胞内离子通量和膜流量。在这里,我们发现当TPC2被其内源配体NAADP和PI(3,5)P2共同激活时,可以差异化地调节其阳离子通透性。NAADP使通道对钙离子通透,PI(3,5)P2使通道对Na+有选择性,两种药物联合使用可增加钙离子流量,但不增加钠离子流量。从机理上讲,这是由于钙离子渗透性的增加,而与离子选择性的变化无关。在功能上,我们证明了细胞通透性NAADP和PI(3,5)P2模拟物协同激活活细胞内天然的TPC2通道,使胞内钙信号全球化,并调节溶酶体的pH和运动。我们的数据显示,不同离子通过同一孔的流量可以独立控制,并确定TPC2可能是一个符合探测器,优化溶酶体钙信号。TPC2是一种对钙离子和钠离子都具有通透性的溶酶体型离子通道。在这里,作者表明,当TPC2同时受到其天然激活剂NAADP和PI(3,5)P2的刺激时,可以选择性地增加其钙通透性。
Two-pore channels are endo-lysosomal cation channels with malleable selectivity filters that drive endocytic ion flux and membrane traffic. Here we show that TPC2 can differentially regulate its cation permeability when co-activated by its endogenous ligands, NAADP and PI(3,5)P2. Whereas NAADP rendered the channel Ca2+-permeable and PI(3,5)P2 rendered the channel Na+-selective, a combination of the two increased Ca2+ but not Na+ flux. Mechanistically, this was due to an increase in Ca2+ permeability independent of changes in ion selectivity. Functionally, we show that cell permeable NAADP and PI(3,5)P2 mimetics synergistically activate native TPC2 channels in live cells, globalizing cytosolic Ca2+ signals and regulating lysosomal pH and motility. Our data reveal that flux of different ions through the same pore can be independently controlled and identify TPC2 as a likely coincidence detector that optimizes lysosomal Ca2+ signaling. TPC2 is a lysosomal ion channel permeable to both calcium and sodium ions. Here, the authors show that TPC2 can selectively increase its calcium permeability when simultaneously challenged by both its natural activators- NAADP and PI(3,5)P2.
NAADP引起的CA(2+)信号传导中JPT2的基本要求。
DOI: 10.1126/scisignal.abd5605
发表时间: 2021-03-23
期刊: Science signaling
影响因子: 7.3
作者:
Gunaratne GS;Brailoiu E;He S;Unterwald EM;Patel S;Slama JT;Walseth TF;Marchant JS
通讯作者: Marchant JS
DOI: 10.1074/jbc.m110.162073
发表时间: 2010-12-03
期刊: The Journal of biological chemistry
影响因子: --
作者:
Brailoiu E;Rahman T;Churamani D;Prole DL;Brailoiu GC;Hooper R;Taylor CW;Patel S
通讯作者: Patel S
DOI: 10.1073/pnas.1705739114
发表时间: 2017-10-10
影响因子: 11.1
作者:
Chao, Yu-Kai;Schludi, Verena;Grimm, Christian
通讯作者: Grimm, Christian
DOI: 10.1083/jcb.200904073
发表时间: 2009-07-27
期刊: The Journal of cell biology
影响因子: --
作者:
Brailoiu E;Churamani D;Cai X;Schrlau MG;Brailoiu GC;Gao X;Hooper R;Boulware MJ;Dun NJ;Marchant JS;Patel S
通讯作者: Patel S
DOI: 10.1126/science.aaw9544
发表时间: 2020-01-17
期刊: Science (New York, N.Y.)
影响因子: --
作者:
Freeman SA;Uderhardt S;Saric A;Collins RF;Buckley CM;Mylvaganam S;Boroumand P;Plumb J;Germain RN;Ren D;Grinstein S
通讯作者: Grinstein S