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Am J Physiol Renal Physiol 270: F200-F205, 1996;
0363-6127/96 $5.00
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AJP - Renal Physiology, Vol 270, Issue 1 200-F205, Copyright © 1996 by American Physiological Society

ARTICLES

Renal responses to intra-arterial administration of adrenomedullin in dogs

D. S. Majid, P. J. Kadowitz, D. H. Coy and L. G. Navar
Department of Physiology, Tulane University School of Medicine, New Orleans, Louisiana 70112, USA.

The present study was undertaken to evaluate the renal responses to intra-arterial infusion (12.5 pmol.kg-1.min-1) for 30 min of adrenomedullin (ADM) in denervated kidneys of anesthetized dogs (n = 8). Total renal blood flow (RBF) was measured with an electromagnetic flow probe, and two single-fiber laser-Doppler needle flow probes were used to measure relative changes in cortical (CBF) and medullary blood flow (MBF). ADM administration resulted in decreases in renal vascular resistance (32.3 +/- 4.9 to 22.3 +/- 3.0 mmHg.ml-1.min.g) and increases in RBF (4.5 +/- 0.5 to 6.0 +/- 0.6 ml.min-1.g-1), CBF (33 +/- 1.3%, n = 41, and MBF (32 +/- 5.7%, n = 5) without changes in glomerular filtration rate. There were also substantial increases in urine flow (11.3 +/- 1.9 to 28 +/- 4.8 microliters.min-1.g-1), as well as in sodium excretion (1.8 +/- 0.2 to 4.2 +/- 0.6 microliter.min-1.g-1). After cessation of ADM infusion, partial recovery of these responses was observed within a 30-min period. Responses to ADM were attenuated during inhibition of nitric oxide (NO) synthesis by nitro-L-arginine (50 micrograms.kg-1.min-1). These findings indicate that renal vasodilator, diuretic, and natriuretic responses to ADM may be mediated by the release of endogenous NO and suggest that ADM could play a role in regulating water and electrolyte excretion by the kidney.


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