TPC proteins are phosphoinositide- activated sodium-selective ion channels in endosomes and lysosomes.

TPC proteins are phosphoinositide- activated sodium-selective ion channels in endosomes and lysosomes.
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DOI:
10.1016/j.cell.2012.08.036
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发表时间:
2012-10-12
期刊:
影响因子:
64.5
通讯作者:
Xu H
Xu H
中科院分区:
生物学1区
文献类型:
--
作者:
Wang X;Zhang X;Dong XP;Samie M;Li X;Cheng X;Goschka A;Shen D;Zhou Y;Harlow J;Zhu MX;Clapham DE;Ren D;Xu H

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哺乳动物双孔通道(TPC 1,2; TPCN 1,TPCN 2)编码细胞内内核内体和溶酶体中的离子通道,并被认为介导由第二信使烟酸腺嘌呤二核苷酸磷酸(NAADP)触发的内溶酶体钙释放。通过直接记录来自野生型和TPC双敲除小鼠的内溶酶体中的TPC,在这里,我们表明,与先前的结论相反,TPC实际上是由PI(3,5)P2激活的钠选择性通道,并且不被NAADP激活。此外,主要的内溶酶体离子是Na+,而不是K+,如先前所假设的。这些结果表明,细胞器膜电位可能会发生很大的调节变化,并可能解释PI(3,5)P2在调节细胞内细胞器的融合电位的特异性。
Mammalian Two-Pore Channels (TPC1, 2; TPCN1, TPCN2) encode ion channels in intracellular endosomes and lysosomes and were proposed to mediate endolysosomal calcium release triggered by the second messenger, nicotinic acid adenine dinucleotide phosphate (NAADP). By directly recording TPCs in endolysosomes from wild-type and TPC double knockout mice, here we show that, in contrast to previous conclusions, TPCs are in fact sodium-selective channels activated by PI(3,5)P2, and are not activated by NAADP. Moreover, the primary endolysosomal ion is Na+, not K+, as had been previously assumed. These findings suggest that the organellar membrane potential may undergo large regulatory changes, and may explain the specificity of PI(3,5)P2 in regulating the fusogenic potential of intracellular organelles.
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