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Am J Physiol Regul Integr Comp Physiol 281: R1311-R1318, 2001;
0363-6119/01 $5.00
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Vol. 281, Issue 4, R1311-R1318, October 2001

Age-dependent renal responses to the bradykinin B2- receptor antagonist icatibant in conscious lambs

Avni Patel and Francine G. Smith

Departments of Physiology and Biophysics/Medicine, University of Calgary, Calgary, Alberta, T2N 4N1 Canada

To investigate the role of endogenously produced bradykinin in modulating renal function during postnatal maturation, various parameters of glomerular and tubular function were measured for 1 h before and after intravenous injection of 12.5 µg/kg of the specific B2-receptor antagonist icatibant to conscious, chronically instrumented lambs aged ~1 (n = 7) and ~6 wk (n = 7). In response to icatibant, and in the absence of any changes in renal hemodynamics, there was an ~80% decrease in glomerular filtration rate (GFR) at 20 min in 1-wk-old lambs that was sustained for 60 min; in 6-wk-old lambs, there was an ~70% decrease in GFR by 20 min, with control levels being reached by 40 min. Icatibant administration was also associated with significant decreases in urinary flow, Cl-, and K+ excretion rates that were similar in both groups of lambs, whereas Na+ excretion decreased only in 6-wk-old lambs. We conclude that bradykinin modulates glomerular and tubular function in an age-dependent manner.

kinins; glomerular filtration rate; Na+ excretion; renin; kallikrein-kinin system


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