Abstract
The effect of arginine vasopressin (AVP) on transepithelial Ca2+ transport in primary cultures of rabbit cortical collecting system cells was examined. Addition of AVP to the basolateral side of the monolayer dose-dependently (EC50 = 0.7 nM) increased active Ca2+ reabsorption from a basal value of 85 ± 2 nmol·h–1·cm–2 to a maximum value of 124 ± 3 nmol·h–1·cm–2. This was paralleled by a dose-dependent (EC50 = 1.1 nM) increase in cellular adenosine 3′,5′-cyclic monophosphate (cAMP) content. Both effects of AVP were mimicked by the V2 agonist deamino-Cys,D-Arg8-vasopressin (dDAVP) and forskolin. Addition of either AVP or dDAVP to the basolateral side evoked a sustained increase in cytosolic free Ca2+ concentration, which resulted from both Ca2+ entry and release from internal stores. Only the effect on Ca2+ entry was mimicked by forskolin, demonstrating that cAMP acts by activating a Ca2+ influx pathway. The present findings demonstrate that AVP stimulates transcellular Ca2+ transport in the cortical collecting system through activation of basolateral V2 receptors coupled to adenylyl cyclase to increase the cellular cAMP content.
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Received: 4 July 1996 / Received after revision and accepted: 3 September 1996
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van Baal, J., Raber, G., de Slegte, J. et al. Vasopressin-stimulated Ca2+ reabsorption in rabbit cortical collecting system: effects on cAMP and cytosolic Ca2+ . Pfluegers Arch 433, 109–115 (1996). https://doi.org/10.1007/s004240050255
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DOI: https://doi.org/10.1007/s004240050255