The effect of arginine vasopressin on ureagenesis in isolated rat hepatocytes

: The effect of arginine vasopressin (AVP) on ureagenesis was measured in isolated rat hepatocytes with ammonium chloride and L(+)-lactate as substrates. AVP was found to stimulate urea synthesis and the dose-response curve suggests that such an effect is present at concentrations of the hormone as low as 25-50 pmol/l. Both the dose-response curve and the concentrations of NH+4 employed suggest that the effect observed could be of physiological significance.