Anionic phospholipids differentially regulate the epithelial sodium channel (ENaC) by interacting with alpha, beta, and gamma ENaC subunits.
Anionic phospholipids differentially regulate the epithelial sodium channel (ENaC) by interacting with alpha, beta, and gamma ENaC subunits.
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DOI:
10.1007/s00424-009-0733-4
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发表时间:
2010-02
影响因子:
4.5
通讯作者:
Ma, He-Ping
中科院分区:
文献类型:
--
作者:
Zhang, Zhi-Ren;Chou, Chu-Fang;Wang, Jing;Liang, You-You;Ma, He-Ping
Anionic phospholipids (APs) present a variety of lipids in the cytoplasmic leaflet of the plasma membrane, including phosphatidylinositol (PI), PI-4-phosphate (PI(4) P), phosphatidylserine (PS), PI-4,5-bisphosphate (PI(4,5) P2), PI-3,4,5-trisphosphate (PI(3,4,5)P3), and phosphatidic acid (PA). We previously showed that PI(4,5)P2 and PI(3,4,5)P3 upregulate the renal epithelial sodium channel (ENaC). Further studies from others suggested that PI(4,5) P2 and PI(3,4,5)P3 respectively target β- and γ-ENaC subunit. To determine whether PI(4,5)P2 and PI(3,4,5)P3 selectively bind to β and γ subunit, we performed lipid-protein overlay experiments. Surprisingly, the results reveal that most APs, including PI(4)P, PS, PI(4,5)P2, PI(3,4,5)P3, and PA, but not PI, non-selectively bind to not only β and γ but also α subunit. To determine how these APs regulate ENaC, we performed inside-out patch-clamp experiments and found that PS, but not PI or PI(4)P, maintained ENaC activity, that PI(4,5)P2 and PI(3,4,5)P3 stimulated ENaC, and that PA, however, inhibited ENaC. These data together suggest that APs differentially regulate ENaC by physically interacting with α-, β-, and γ-ENaC. Further, the data from cell-attached patch-clamp and confocal microscopy experiments indicate that PA, a product of phospholipase D, may provide one of the pathways for inhibition of ENaC by endothelin receptors.
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DOI:
10.1016/0922-4106(93)90166-7
发表时间:
1993-03-15
期刊:
EUROPEAN JOURNAL OF PHARMACOLOGY-MOLECULAR PHARMACOLOGY SECTION
影响因子:
--
作者:
AMBAR, I;SOKOLOVSKY, M
通讯作者:
SOKOLOVSKY, M
影响因子:
56.9
作者:
Baukrowitz, T;Schulte, U;Fakler, B
通讯作者:
Fakler, B
DOI:
10.1085/jgp.200709800
发表时间:
2007-10
期刊:
The Journal of general physiology
影响因子:
--
作者:
Pochynyuk O;Tong Q;Medina J;Vandewalle A;Staruschenko A;Bugaj V;Stockand JD
通讯作者:
Stockand JD
影响因子:
56.9
作者:
Shyng, SL;Nichols, CG
通讯作者:
Nichols, CG
DOI:
10.1152/ajprenal.00403.2007
发表时间:
2008-01-01
影响因子:
4.2
作者:
Pochynyuk, Oleh;Bugaj, Vladislav;Stockand, James D.
通讯作者:
Stockand, James D.