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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Am+J+Physiol+Cell+Physiol
2015 ; 309
(9
): C608-15
Nephropedia Template TP
gab.com Text
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English Wikipedia
Activation of protein kinase C? increases phosphorylation of the UT-A1 urea
transporter at serine 494 in the inner medullary collecting duct
#MMPMID26333598
Blount MA
; Cipriani P
; Redd SK
; Ordas RJ
; Black LN
; Gumina DL
; Hoban CA
; Klein JD
; Sands JM
Am J Physiol Cell Physiol
2015[Nov]; 309
(9
): C608-15
PMID26333598
show ga
Hypertonicity increases urea transport, as well as the phosphorylation and
membrane accumulation of UT-A1, the transporter responsible for urea permeability
in the inner medullary collect duct (IMCD). Hypertonicity stimulates urea
transport through PKC-mediated phosphorylation. To determine whether PKC
phosphorylates UT-A1, eight potential PKC phosphorylation sites were individually
replaced with alanine and subsequently transfected into LLC-PK1 cells. Of the
single mutants, only ablation of the S494 site dampened induction of total UT-A1
phosphorylation by the PKC activator phorbol dibutyrate (PDBu). This result was
confirmed using a newly generated antibody that specifically detected
phosphorylation of UT-A1 at S494. Hypertonicity increased UT-A1 phosphorylation
at S494. In contrast, activators of cAMP pathways (PKA and Epac) did not increase
UT-A1 phosphorylation at S494. Activation of both PKC and PKA pathways increased
plasma membrane accumulation of UT-A1, although activation of PKC alone did not
do so. However, ablating the PKC site S494 decreased UT-A1 abundance in the
plasma membrane. This suggests that the cAMP pathway promotes UT-A1 trafficking
to the apical membrane where the PKC pathway can phosphorylate the transporter,
resulting in increased UT-A1 retention at the apical membrane. In summary,
activation of PKC increases the phosphorylation of UT-A1 at a specific residue,
S494. Although there is no cross talk with the cAMP-signaling pathway,
phosphorylation of S494 through PKC may enhance vasopressin-stimulated urea
permeability by retaining UT-A1 in the plasma membrane.
|Animals
[MESH]
|Cell Membrane/drug effects/*enzymology
[MESH]
|Cyclic AMP-Dependent Protein Kinases/metabolism
[MESH]