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P2Y2 receptor mRNA and protein expression is altered in inner medullas of hydrated and dehydrated rats: relevance to AVP-independent regulation of IMCD function.

Authors: Kishore, BK  Krane, CM  Miller, RL  Shi, H  Zhang, P  Hemmert, A  Sun, R  Nelson, RD 
Citation: Kishore BK, etal., Am J Physiol Renal Physiol. 2005 Jun;288(6):F1164-72. Epub 2005 Feb 1.
Pubmed: (View Article at PubMed) PMID:15687250
DOI: Full-text: DOI:10.1152/ajprenal.00199.2004

Arginine vasopressin (AVP), acting through a cAMP second messenger system, regulates osmotic water permeability (Pf) of the collecting duct. In the collecting duct, the activities of cAMP and phosphonositides (PI) are mutually inhibitory. The P2Y2 receptor (P2Y2-R) is a G protein-coupled extracellular nucleotide receptor associated with PI signaling pathway. Previously, we showed that P2Y2-R is expressed in inner medullary collecting duct (IMCD) of rat, and its agonist (ATP/UTP) activation decreased AVP-induced Pf and resulted in enhanced production of prostaglandin E2. Hydrated and dehydrated states are associated with alterations in the circulating levels of AVP, expression and/or subcellular distribution of AVP-regulated aquaporin-2 water channel in IMCD and thus Pf of IMCD. We hypothesized that altered expression and/or signaling via P2Y2-R may also modulate IMCD function in these conditions. Sprague-Dawley rats were subjected to dehydration by water deprivation (48 h) or hydration (48 or 96 h) by providing sucrose water. Hydration or dehydration resulted in marked alterations in mRNA expression (Northern blot analysis and real-time RT-PCR) and protein abundance (Western blot analysis) of P2Y2-R, with hydrated rats showing significantly higher levels compared with dehydrated rats. Sequential hydration and dehydration experiments also revealed that the regulated expression profiles of P2Y2-R mRNA and protein are discordant. Conversely, the expression of V2-R mRNA remained unaltered during hydration and dehydration. Because virtually all renal cells release ATP in a regulated fashion, the observed alterations in P2Y2-R expression in the inner medulla in hydrated and dehydrated states may constitute a novel mechanism of purinergic modulation of IMCD function.

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CRRD Object Information
CRRD ID: 2316687
Created: 2010-02-19
Species: All species
Last Modified: 2010-02-19
Status: ACTIVE



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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.