Aldosterone-induced ENaC and basal Na⁺/K⁺-ATPase trafficking via protein kinase D1-phosphatidylinositol 4-kinaseIII¦Â trans Golgi signalling in M1 cortical collecting duct cells

详细信息    查看全文

• 作者：Ruth Dooley ; ^{ruthdooley@rcsi.ie} ; Emmanuelle Angibaud¹ ; Yamil R. Yusef ; Warren Thomas ; Brian J. Harvey
• 关键词：PKD ; protein kinase D ; ENaC ; epithelial sodium channel ; Na+/K+-ATPase ; sodium potassium ATPase ; PI4KIII¦Â ; phosphatidylinositol 4-kinaseIII¦Â ; M1-CCD ; M1 cortical collecting duct ; MR ; mineralocorticoid receptor ; TGN ; trans Golgi network
• 刊名：Molecular and Cellular Endocrinology
• 出版年：2013
• 出版时间：15 June, 2013
• 年：2013
• 卷：372
• 期：1-2
• 页码：86-95
• 全文大小：3659 K

文摘

Aldosterone regulates Na⁺ transport in the distal nephron through multiple mechanisms that include the transcriptional control of epithelial sodium channel (ENaC) and Na⁺/K⁺-ATPase subunits. Aldosterone also induces the rapid phosphorylation of Protein Kinase D1 (PKD1). PKD isoforms regulate protein trafficking, by the control of vesicle fission from the trans Golgi network (TGN) through activation of phosphatidylinositol 4-kinaseIII¦Â (PI4KIII¦Â). We report rapid ENaC¦Ã translocation to the plasma membrane after 30 min aldosterone treatment in polarized M1 cortical collecting duct cells, which was significantly impaired in PKD1 shRNA-mediated knockdown cells. In PKD1-deficient cells, the ouabain-sensitive current was significantly reduced and Na⁺/K⁺-ATPase ¦Á and ¦Â subunits showed aberrant localization. PKD1 and PI4KIII¦Â localize to the TGN, and aldosterone induced an interaction between PKD1 and PI4KIII¦Â following aldosterone treatment. This study reveals a novel mechanism for rapid regulation of ENaC and the Na⁺/K⁺-ATPase, via directed trafficking through PKD1-PI4KIII¦Â signalling at the level of the TGN.