Protein kinase D1 modulates aldosterone-induced ENaC activity in a renal cortical collecting duct cell line.

Abstract:

:Aldosterone treatment of M1-CCD cells stimulated an increase in epithelial Na(+) channel (ENaC) alpha-subunit expression that was mainly localized to the apical membrane. PKD1-suppressed cells constitutively expressed ENaCalpha at low abundance, with no increase after aldosterone treatment. In the PKD1-suppressed cells, ENaCalpha was mainly localized proximal to the basolateral surface of the epithelium both before and after aldosterone treatment. Apical membrane insertion of ENaCbeta in response to aldosterone treatment was also sensitive to PKD1 suppression as was the aldosterone-induced rise in the amiloride-sensitive, trans-epithelial current (I(TE)). The interaction of the mineralocorticoid receptor (MR) with specific elements in the promoters of aldosterone responsive genes is stabilized by ligand interaction and phosphorylation. PKD1 suppression inhibited aldosterone-induced SGK-1 expression. The nuclear localization of MR was also blocked by PKD1 suppression and MEK antagonism implicating both these kinases in MR nuclear stabilization. PKD1 thus modulates aldosterone-induced ENaC activity through the modulation of sub-cellular trafficking and the stabilization of MR nuclear localization.

journal_name

Mol Cell Endocrinol

authors

McEneaney V,Dooley R,Yusef YR,Keating N,Quinn U,Harvey BJ,Thomas W

doi

10.1016/j.mce.2010.04.019

subject

Has Abstract

pub_date

2010-08-30 00:00:00

pages

8-17

issue

1-2

eissn

0303-7207

issn

1872-8057

pii

S0303-7207(10)00236-4

journal_volume

325

pub_type

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