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10.1152/ajpcell.00171.2014

http://scihub22266oqcxt.onion/10.1152/ajpcell.00171.2014
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suck abstract from ncbi


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pmid26333598      Am+J+Physiol+Cell+Physiol 2015 ; 309 (9): C608-15
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  • 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 PMID26333598show 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.
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