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Am J Physiol Renal Physiol 282: F103-F112, 2002; doi:10.1152/ajprenal.00155.2001
0363-6127/02 $5.00
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Vol. 282, Issue 1, F103-F112, January 2002

Effects of amino acids and glucagon on renal hemodynamics in type 1 diabetes

Katherine R. Tuttle, Mark E. Puhlman, Sheryl K. Cooney, and Robert A. Short

Department of Research, The Heart Institute of Spokane, Spokane, Washington 99204-2340

Increased dietary protein and circulating amino acids raise glomerular filtration rate (GFR) and pressure. In diabetes, this glomerular hyperfiltration response is augmented. The purpose of this study was to determine whether glucagon mediates the augmented GFR response to amino acids in diabetes and whether the responses to amino acids and glucagon depend on prostaglandins. Patients with type 1 diabetes mellitus (n = 12) and normal control subjects (n = 12) were studied in a series of six experiments, each on different occasions. Baseline GFR was not significantly increased, but filtration fraction was higher in diabetes. In response to amino acid infusion, GFR increased more and filtration fraction was greater among those with diabetes. Their augmented GFR response to amino acids was not inhibited by octreotide or indomethacin. Participants with diabetes also had enhanced GFR and renal plasma flow responses to glucagon infusion, both of which were inhibited by indomethacin. Glomerular hyperfiltration responses induced by amino acids or glucagon occur by divergent pathways in diabetes; only the response to glucagon is prostaglandin dependent.

prostaglandins; glomerular hyperfiltration; octreotide; indomethacin


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