Vasopressin receptor antagonists are a new class of drugs that address the problems of fluid retention, hyponatremia, and renal dysfunction in heart failure. Elevated vasopressin levels in heart failure cause myocardial fibrosis, hypertrophy and vasoconstriction by activating the V1a receptors, as well as water retention and hyponatremia by activating V2 receptors. Antagonism of V1a receptors a...

A subcellular fraction prepared from rat kidney medulla contained vasopressin-sensitive adenylate cyclase and vasopressin binding sites. Vasopressin stimulation resulted in an increase in the maximal velocity of the reaction with no change in the apparent K, for ATP. A maximum activation ratio (5 to 10) was obtained at low Mg2+ concentration (0.75 mM) and pH 7.4. The apparent Km for vasopressin...

A subcellular fraction prepared from rat kidney medulla contained vasopressin-sensitive adenylate cyclase and vasopressin binding sites. Vasopressin stimulation resulted in an increase in the maximal velocity of the reaction with no change in the apparent K, for ATP. A maximum activation ratio (5 to 10) was obtained at low Mg2+ concentration (0.75 mM) and pH 7.4. The apparent Km for vasopressin...

The (pro)renin receptor is a newly discovered member of the brain renin-angiotensin system. To investigate the role of brain (pro)renin receptor in hypertension, adeno-associated virus-mediated (pro)renin receptor short hairpin RNA was used to knockdown (pro)renin receptor expression in the brain of nontransgenic normotensive and human renin-angiotensinogen double-transgenic hypertensive mice. ...

The present study was designed to determine whether arginine vasopressin (AVP) can stimulate nitric oxide (NO) production within the renal medulla and thereby modulate renal medullary blood flow. An in vivo microdialysis/NO trapping technique was used to determine changes in medullary interstitial [NO]. AVP (2 ng/kg per minute) was delivered into the renal medullary interstitium and resulted in...

Vasopressin receptor expression on LLC-PK1-cells (a porcine renal tubular cell line) during cell culture is still not fully understood. We studied receptor expression using a novel vasopressin analogue with high specific radioactivity ([125I][8-p-hydroxy-phenylpropionyl]-lys8-vasopressin, 74EBq/mol (2000 Ci/mmol)). LLC-PK1 cells were grown in monolayers for 1 to 6 days. Scatchard analysis perfo...

Yao Y, Fu L-Y, Zhang X, van den Pol AN. Vasopressin and oxytocin excite MCH neurons, but not other lateral hypothalamic GABA neurons. Am J Physiol Regul Integr Comp Physiol 302: R815–R824, 2012. First published January 18, 2012; doi:10.1152/ajpregu.00452.2011.—Neurons that synthesize melanin-concentrating hormone (MCH) colocalize GABA, regulate energy homeostasis, modulate water intake, and inf...

To examine the effect of vasopressin on the sarcolemmal ATP-sensitive K (K(ATP)) channel, cell-attached, insideout and open-cell-attached methods of patch clamp techniques were used in isolated guinea pig ventricular myocytes. Suppressing both glycolytic and oxidative ATP production attained K(ATP) channel activation. In the cell-attached mode, vasopressin inhibited KATP channels in a concentra...