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
Ma, He-Ping
中科院分区:
医学3区
文献类型:
--
作者:
Zhang, Zhi-Ren;Chou, Chu-Fang;Wang, Jing;Liang, You-You;Ma, He-Ping

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阴离子磷脂 (AP) 在质膜的细胞质小叶中呈现多种脂质,包括磷脂酰肌醇 (PI)、PI-4-磷酸 (PI(4) P)、磷脂酰丝氨酸 (PS)、PI-4,5-二磷酸 (PI(4,5) P2)、PI-3,4,5-三磷酸 (PI(3,4,5)P3) 和磷脂酸(宾夕法尼亚州)。我们之前表明 PI(4,5)P2 和 PI(3,4,5)P3 上调肾上皮钠通道 (ENaC)。其他人的进一步研究表明,PI(4,5) P2 和 PI(3,4,5)P3 分别针对 β- 和 γ-ENaC 亚基。为了确定 PI(4,5)P2 和 PI(3,4,5)P3 是否选择性结合 β 和 γ 亚基,我们进行了脂质-蛋白质叠加实验。令人惊讶的是,结果表明大多数 AP,包括 PI(4)P、PS、PI(4,5)P2、PI(3,4,5)P3 和 PA,但不包括 PI,不仅非选择性地结合 β 和 γ,还非选择性地结合 α 亚基。为了确定这些 AP 如何调节 ENaC,我们进行了由内而外的膜片钳实验,发现 PS(而非 PI 或 PI(4)P)维持了 ENaC 活性,PI(4,5)P2 和 PI(3,4,5)P3 刺激 ENaC,而 PA 抑制 ENaC。这些数据共同表明 AP 通过与 α-、β- 和 γ-ENaC 物理相互作用来差异调节 ENaC。此外,来自细胞贴壁膜片钳和共聚焦显微镜实验的数据表明,磷脂酶 D 的产物 PA 可能提供内皮素受体抑制 ENaC 的途径之一。
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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发表时间: 1993-03-15
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