Effect of peptide YY on human renal function.

Peptide YY (PYY) is released from the intestine into the circulation in response to ingestion of food. As PYY/neuropeptide Y (NPY) receptors have recently been identified in the human kidney, we examined the effect of PYY on human renal function. Male subjects (6 per group) received control infusate or PYY at 0.4 or 1.2 pmol.kg-1.min-1 intravenously for 90 min with control periods before and after. Infusion of PYY at the lower dose reproduced normal postprandial plasma concentrations and caused significant decreases in glomerular filtration rate (10% reduction), plasma renin activity (30% reduction), and aldosterone levels while increasing sodium excretion by approximately 30% (all P < 0.01). Infusion of PYY at the higher dose, which reproduced plasma levels seen during a diarrheal illness, resulted in similar changes in renal function and also reduced renal plasma flow by approximately 10% (P < 0.05). Therefore, PYY may be an important mediator of the normal postprandial natriuretic response, and PYY agonists could provide a novel approach to the treatment of patients with sodium overload.