Renal effects of glucagon-like peptide in rats.
The present study examined the effects of recombinant glucagon-like peptide-1-(7-36)amide (rGLP-1) on renal hemodynamics and excretory function in innervated and denervated kidneys of anesthetized rats. Intravenous infusion of rGLP-1 at a dose of 1 microg x kg(-1) x min(-1) increased urine flow and Na(+) excretion 13-fold in the innervated kidney. The natriuretic and diuretic response to rGLP-1 was attenuated in the denervated kidney in which urine flow and Na(+) excretion only increased 3-fold. Fractional excretion of Li(+), an index of proximal tubular reabsorption, increased 219% in the innervated kidney but only 54% in the denervated kidney during infusion of rGLP-1. The diuretic and natriuretic response to rGLP-1 was associated with an increase in glomerular filtration rate (39%) in the innervated kidney, but it had no effect on glomerular filtration rate in the denervated kidney. These results indicate that the natriuretic and diuretic effects of rGLP-1 are due to inhibition of Na(+) reabsorption in the proximal tubule. It also increases glomerular filtration rate in kidneys with an intact renal innervation.
Moreno
Carol
C
Department of Physiology, Medical College of Wisconsin, 8701 Watertown Plank Road, PO Box 26509, Milwaukee, WI 53226-0509, USA.
Mistry
Mahesh
M
Roman
Richard J
RJ
D000818:Animals; D004305:Dose-Response Relationship, Drug; D005919:Glomerular Filtration Rate / Q000502:physiology; D005934:Glucagon / Q000502:physiology*; D052216:Glucagon-Like Peptide 1; D004763:Glucagon-Like Peptides; D007668:Kidney / Q000098:blood supply / Q000294:innervation / Q000502:physiology*; D008297:Male; D018377:Neurotransmitter Agents / Q000502:physiology; D010446:Peptide Fragments / Q000502:physiology*; D051381:Rats; D017207:Rats, Sprague-Dawley
D018377:Neurotransmitter Agents; D010446:Peptide Fragments; C055453:glucagon-like peptide 1 (7-36)amide; D004763:Glucagon-Like Peptides; D052216:Glucagon-Like Peptide 1; D005934:Glucagon