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2008 ; 22
(4
): 881-92
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Aldosterone regulates rapid trafficking of epithelial sodium channel subunits in
renal cortical collecting duct cells via protein kinase D activation
#MMPMID18202152
McEneaney V
; Harvey BJ
; Thomas W
Mol Endocrinol
2008[Apr]; 22
(4
): 881-92
PMID18202152
show ga
Aldosterone elicits rapid physiological responses in target tissues such as the
distal nephron through the stimulation of cell signaling cascades. We identified
protein kinase D (PKD1) as an early signaling response to aldosterone treatment
in the M1-cortical collecting duct (M1-CCD) cell line. PKD1 activation was
blocked by the PKC inhibitor chelerythrine chloride and by rottlerin, a specific
inhibitor of PKCdelta. The activation of PKCdelta and PKCepsilon coincided with
PKD1 activation and while a complex was formed between PKD1 and PKCepsilon after
aldosterone treatment, there was a concurrent reduction in PKD1 association with
PKCdelta. A stable PKD1 knockdown M1-CCD-derrived clone was developed in which
PKD1 expression was 90% suppressed by gene silencing with a PKD1-specific siRNA.
The effect of aldosterone treatment on the subcellular distribution of enhanced
cyan fluorescent protein (eCFP)-tagged epithelial sodium channel (ENaC) subunits
in wild type (WT) and PKD1 suppressed cells was examined using confocal
microscopy. In an untreated confluent monolayer of M1-CCD cells, alpha, beta, and
gamma ENaC subunits were evenly distributed throughout the cytoplasm of WT and
PKD1-suppressed cells. After 2 min treatment, aldosterone stimulated the
localization of each of the ENaC subunits to discrete regions within the
cytoplasm of WT cells. The translocation of eCFP-ENaC subunits in WT cells was
inhibited by rottlerin and the mineralocorticoid receptor (MR) antagonist
spironolactone. No subcellular translocation of eCFP-ENaC subunits was observed
in PKD1-suppressed cells treated with aldosterone. These data demonstrate the
involvement of a novel MR/PKCdelta /PKD1 signaling cascade in the earliest ENaC
subunit intracellular trafficking events that follow aldosterone treatment.