RGD Reference Report - The vasopressin receptors colocalize with vasopressin in the magnocellular neurons of the rat supraoptic nucleus and are modulated by water balance. - Rat Genome Database

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The vasopressin receptors colocalize with vasopressin in the magnocellular neurons of the rat supraoptic nucleus and are modulated by water balance.

Authors: Hurbin, A  Orcel, H  Alonso, G  Moos, F  Rabie, A 
Citation: Hurbin A, etal., Endocrinology 2002 Feb;143(2):456-66.
RGD ID: 70387
Pubmed: PMID:11796498   (View Abstract at PubMed)
DOI: DOI:10.1210/endo.143.2.8643   (Journal Full-text)

Activity of the magnocellular neurons that synthesize vasopressin in the supraoptic and paraventricular nuclei of the hypothalamus is modulated by local release of the neuropeptide within the nuclei. V(1a) and V(1b) vasopressin receptor genes are expressed in these cells. The present study reports the localization of V(1a) and V(1b) receptors using multiple labeling immunocytochemistry. Both receptors are mainly located in vasopressinergic magnocellular neurons and colocalized with vasopressin in cytoplasmic vesicles dispersed throughout the cell. Possible functional modifications of the mRNA and protein levels of the V(1a) receptor, the major isoform, were also investigated by semiquantitative in situ hybridization and immunocytochemistry in rats submitted to reduced or increased water intake. V(1a) mRNA and receptor levels varied with water balance. V(1a) mRNA level dropped in rats submitted to high water intake. Conversely, dehydration up-regulated the V(1a) receptor content. These observations suggest that the pathways that regulate the expression of the genes encoding vasopressin and the V(1a) receptor are linked, which fits the present findings that the two partners are colocalized in cytoplasmic vesicles. Colocalization might explain how V(1) autoreceptors are controlled by cell activity and/or local concentration of vasopressin (released locally by the neurons themselves), allowing fine adjustment of magnocellular neuron activity.

Gene Ontology Annotations    Click to see Annotation Detail View

Biological Process
TermQualifierEvidenceWithReferenceNotesSourceOriginal Reference(s)
cellular response to water deprivation  IEP 70387 RGD 

Objects Annotated

Genes (Rattus norvegicus)
Avpr1a  (arginine vasopressin receptor 1A)

Objects referenced in this article
Gene Avpr1b arginine vasopressin receptor 1B Rattus norvegicus

Additional Information