Influence of intravenously administered leptin on nitric oxide production, renal hemodynamics and renal function in the rat

• Published in: Regulatory peptides 2004-08, Vol.120 (1), p.59-67
• Main Authors: Bełtowski, Jerzy, Jochem, Jerzy, Wójcicka, Grażyna, Żwirska-Korczala, Krystyna
• Format: Article
• Language: English
• Subjects: Animals; Arterial hypertension; Atrial natriuretic peptide; Biological and medical sciences; Blood Pressure - drug effects; Cardiac Output; Creatinine - urine; Cyclic GMP; Cyclic GMP - urine; Fundamental and applied biological sciences. Psychology; Injections, Intravenous; Kidney - drug effects; Kidney - physiopathology; Kidney Function Tests; Leptin; Leptin - administration & dosage; Male; Medical sciences; Metabolic diseases; Nitrates - blood; Nitric oxide; Nitric Oxide - metabolism; Nitrites - blood; Obesity; Rats; Rats, Wistar; Regional Blood Flow; Renal Circulation - drug effects; Renal Circulation - physiology; Sodium - urine; Vertebrates: endocrinology
• ISSN: 0167-0115; 1873-1686
• DOI: 10.1016/j.regpep.2004.02.012

We investigated the effect of leptin on systemic nitric oxide (NO) production, arterial pressure, renal hemodynamics and renal excretory function in the rat. Leptin (1 mg/kg) was injected intravenously and mean arterial pressure (MAP), heart rate (HR), renal blood flow (RBF) and renal cortical blood flow (RCBF), were measured for 210 min after injection. Urine was collected for seven consecutive 30-min periods and blood samples were withdrawn at 15, 45, 75, 105, 135, 165 and 195 min after leptin administration. Leptin had no effect on MAP, HR, RBF, RCBF and creatinine clearance, but increased urine output by 37.8% (0–30 min), 32.4% (31–60 min) and 27.0% (61–90 min), as well as urinary sodium excretion by 175.8% (0–30 min), 136.4% (31–60 min) and 124.2% (61–90 min). In contrast, leptin had no effect on potassium and phosphate excretion. Plasma concentration of NO metabolites, nitrites+nitrates (NO x ), increased following leptin injection at 15, 45, 75 and 105 min by 27.7%, 178.1%, 156.4% and 58.7%, respectively. Leptin increased urinary NO x excretion by 241.6% (0–30 min), 552.6% (31–60 min), 430.7% (61–90 min) and 88.9% (91–120 min). This was accompanied by increase in plasma and urinary cyclic GMP. These data indicate that leptin stimulates systemic NO production but has no effect on arterial pressure and renal hemodynamics.