NCIt definition : Vasopressin V1b receptor (424 aa, 47 kDa) is encoded by the human AVPR1B gene. This
protein plays a role in G protein-coupled receptor signaling mediated by vasopressin.;
NCIt note : This protein acts as receptor for arginine vasopressin. This receptor belongs to the
subfamily of G-protein coupled receptors which includes AVPR1A, V2R and OXT receptors.
Its activity is mediated by G proteins which stimulate a phosphatidylinositol-calcium
second messenger system. The receptor is primarily located in the anterior pituitary,
where it stimulates ACTH release. It is expressed at high levels in ACTH-secreting
pituitary adenomas as well as in bronchial carcinoids responsible for the ectopic
ACTH syndrome. A spliced antisense transcript of this gene has been reported but its
function is not known.;