NCIt definition : The biologic effects of arginine vasopressin (AVP) are mediated by 3 receptor subtypes:
the V1A and V1B receptors that activate phospholipases via G alpha (q/11), and the
V2 receptor that activates adenylyl cyclase by interacting with G alpha (s). This
subfamily of G-protein coupled receptors also includes OXT receptors. Their activity
is mediated by G proteins which stimulate a phosphatidylinositol-calcium second messenger
system. All are involved in the control of body fluid osmolality, blood volume, blood
pressure, and vascular tone. (from OMIM);