OPC-21268 is a vasopressin V1a selective antagonist.
OPC-21268 is one of 2 non-peptide V1a selective antagonists, along with SR-49059. Arginine vasopressin (AVP) is a hormone that plays an important part in circulatory and water homoeostasis and is important in renal hemodynamic alterations, water retention, and cardiac remodeling in congestive heart failure (CHF). There are three AVP receptor subtypes-V1a, V1b, and V2 - all belong to the large rhodopsin-like G-protein-coupled receptor family. V(1a) antagonists improve water balance and cardiac hypertrophy in CHF and might be beneficial for the treatment of water retention and cardiac remodeling in CHF.
General and comparative endocrinology, 157(2), 196-202 (2008-06-17)
Anuran amphibians do not drink orally but absorb water osmotically through the highly permeable ventral skin. In this cutaneous water absorption, roles of the putative cerebral osmoreceptors and functions of arginine vasotocin (AVT) were examined in the central nervous system
Journal of pharmacological sciences, 95(1), 47-55 (2004-05-22)
Effects of V(1) (OPC-21268) and V(2) (OPC-31260) vasopressin antagonists on blood pressure (BP) short-term variability were investigated in adult spontaneously hypertensive rats (SHR) under basal conditions and after the stimulation of vasopressin release by hemorrhage. BP was recorded intra-arterially and
Rossiiskii fiziologicheskii zhurnal imeni I.M. Sechenova, 93(6), 625-634 (2007-09-14)
In experiments on non-anesthetized female Wistar rats, it has been shown that injection of 1-deamino-arginine-vasotocin (1dAVT) increases sodium excretion and solute-free water reabsorption. Antagonists of V1-receptors (OPC-31260, Otsuka Pharmaceutical Co., Ltd., Japan) eliminates the effect water reabsorption whereas antagonist of
Journal of comparative physiology. B, Biochemical, systemic, and environmental physiology, 180(3), 393-402 (2009-12-02)
Amphibian skin has osmoregulatory functions, with Na(+) crossing from outside to inside. Na(+) transport can be measured as the short-circuit current (SCC). We investigated the short-term and long-term effects of arginine vasotocin (AVT) and mesotocin (MT) (which modulate Na(+) transport)
General and comparative endocrinology, 157(1), 63-69 (2008-05-02)
Physiological function of arginine vasotocin (AVT) and effect of receptor antagonists of vasopressin were electrophysiologically investigated on transepithelial transport of ions in the abdominal skin of Hyla japonica and Rana nigromaculata by means of the Ussing chamber system. Administrations of
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