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Am J Physiol Regul Integr Comp Physiol 269: R1351-R1355, 1995;
0363-6119/95 $5.00
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AJP - Regulatory, Integrative and Comparative Physiology, Vol 269, Issue 6 1351-R1355, Copyright © 1995 by American Physiological Society

ARTICLES

Effect of proANF-(31--67) on sodium excretion in conscious monkeys

B. A. Benjamin and T. V. Peterson
Department of Cell Biology, Duke University Medical Center, Durham, North Carolina 27710, USA.

The purpose of this study was to determine the effect of proANF-(31--67) on renal function in conscious, chronically instrumented monkeys (Macaca fascicularis). The experimental protocol consisted of a 30-min control period followed by 60 min of peptide infusion and a 30-min recovery period. Atrial natriuretic factor (ANF)-(99--126), proANF-(31--67), of a combination of ANF-(99--126) plus proANF-(31--67) was infused at 15 pmol.kg-1.min-1. ANF-(99--126) caused sodium excretion to increase from 12.5 +/- 3 to a peak of 37.9 +/- 10.4 mueq/min, whereas fractional sodium excretion (FENa) increased from 0.69 +/- 0.2 to 2.3 +/- 0.43%. ProANF-(31--67) increased sodium excretion from 12.7 +/- 5 to a peak of 23.3 +/- 9.0 mueq/min and FENa from 0.56 +/- 0.07 to a peak of 1.15 +/- 0.4%. When ANF-(99--126) and proANF-(31--67) were infused in combination, sodium excretion increased from 9.6 +/- 3 to a peak of 5.19 +/- 12.5 mueq/min, whereas FENa increased from 0.97 +/- 0.4 to 3.9 +/- 1.1%. Mean arterial pressure decreased by approximately 10 mmHg in all three groups. These findings indicate that intravenously administered proANF-(31--67) causes an increase in sodium excretion and that when proANF-(31--67) and ANF-(99--126) are given in combination, they act in an additive fashion to increase renal sodium excretion.


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