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Calcium-sensing receptor attenuates AVP-induced aquaporin-2 expression via a calmodulin-dependent mechanism

Bustamante, Mauro
de Seigneux, Sophie
Dimitrov, Mitko
Mordasini, David
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Published in Journal of the American Society of Nephrology. 2008, vol. 19, no. 1, p. 109-116
Abstract Recent evidence suggests that arginine vasopressin (AVP)-dependent aquaporin-2 expression is modulated by the extracellular calcium-sensing receptor (CaSR) in principal cells of the collecting duct, but the signaling pathways mediating this effect are unknown. Using a mouse cortical collecting duct cell line (mpkCCD(cl4)), we found that increasing the concentration of apical extracellular calcium or treating with the CaSR agonists neomycin or Gd(3+) attenuated AVP-dependent accumulation of aquaporin-2 mRNA and protein; CaSR gene-silencing prevented this effect. Calcium reduced the AVP-induced accumulation of cAMP, but this did not occur by increased degradation of cAMP by phosphodiesterases or by direct inhibition of adenylate cyclase. Notably, the effect of extracellular calcium on AVP-dependent aquaporin-2 expression was prevented by inhibition of calmodulin. In summary, our results show that high concentrations of extracellular calcium attenuate AVP-induced aquaporin-2 expression by activating the CaSR and reducing coupling efficiency between V(2) receptor and adenylate cyclase via a calmodulin-dependent mechanism in cultured cortical collecting duct cells.
Keywords Adenylate Cyclase/metabolismAnimalsAquaporin 2/geneticsArginine Vasopressin/pharmacologyCalcium/pharmacology/physiologyCalmodulin/physiologyGene Expression Regulation/drug effectsKidney Tubules, Collecting/drug effects/physiologyKineticsMicePolymerase Chain ReactionReceptors, Calcium-Sensing/drug effects/physiologyReceptors, Vasopressin/physiology
PMID: 18032798
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Research groups Groupe Pierre-Yves Martin (néphrologie) (30)
Laboratoire de physiologie et pathophysiologie des cellules rénales (29)
(ISO format)
BUSTAMANTE, Mauro et al. Calcium-sensing receptor attenuates AVP-induced aquaporin-2 expression via a calmodulin-dependent mechanism. In: Journal of the American Society of Nephrology, 2008, vol. 19, n° 1, p. 109-116. doi: 10.1681/ASN.2007010092 https://archive-ouverte.unige.ch/unige:1949

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Deposited on : 2009-06-10

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