Abstract
Expression and regulation of vasopressin V2 and V1a receptors were studied at the mRNA level in the rat kidney. Two V2 mRNA variants were identified and shown to arise from a single gene by alternative splicing using one donor and two different acceptor sites. The long (V2L) form encodes the adenylyl cyclase-coupled receptor. The short (V2S) form lacks the nucleotide sequence encoding the putative seventh transmembrane domain and undergoes a frame shift in its 3'end coding region; it is inactive on the cyclase pathway in transfected cells. Measurement of mRNAs, carried out by quantitative reverse transcription-polymerase chain reaction (RT-PCR) on microdissected nephrons, demonstrated that neither V2L, V2S nor V1A mRNAs are expressed in glomeruli and proximal tubules (<100 mRNA copies/glomerulus or mm of tubular length), whereas they are present in the ascending limb of Henle's loop and in the collecting tubule. The V2L mRNA, which is always predominant in these structures, is expressed throughout the collecting tubule at 10 times higher levels (30,000 copies/mm) than in the thin and thick ascending limbs. The ratio of the V2S over V2L mRNA is constant (15%) in all nephron segments; hence high V2S levels are only observed in the collecting tubule. The V1A mRNA is slightly expressed in the thin ascending limb, absent in the thick ascending limb and reaches its maximum in the cortical collecting duct (4,000 copies/mm), before gradually decreasing to undetectable levels in the terminal collecting duct. Finally, in vivo administration of a vasopressin V2 agonist decreased by 50% V2L and V2S mRNAs, but did not alter the V1A mRNA level. We conclude that this study provides the quantitation, on a molar basis, of vasopressin receptor mRNAs in kidney tubules and demonstrates the occurence of two V2 mRNA spliced variants which are similarly down-regulated.
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Firsov, D., Mandon, B., Morel, A. et al. Molecular analysis of vasopressin receptors in the rat nephron. Evidence for alternative splicing of the V2 receptor. Pflugers Arch. 429, 79–89 (1994). https://doi.org/10.1007/BF02584033
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DOI: https://doi.org/10.1007/BF02584033