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. 1992 May;89(5):1411–1417. doi: 10.1172/JCI115730

Atrial natriuretic peptide(31-67) inhibits Na+ transport in rabbit inner medullary collecting duct cells. Role of prostaglandin E2.

M E Gunning 1, H R Brady 1, G Otuechere 1, B M Brenner 1, M L Zeidel 1
PMCID: PMC443010  PMID: 1533229

Abstract

Atrial natriuretic peptide (ANP)(31-67), a portion of the atrial peptide prohormone, circulates in humans, and its plasma level varies with atrial pressure. Like the more widely studied carboxy-terminal fragment ANP(99-126), ANP(31-67) stimulates natriuresis and diuresis. We examined the mechanism of this natriuresis by measuring the effects of ANP(31-67) on Na+ transport in cells of the rabbit inner medullary collecting duct (IMCD). ANP(31-67) (10(-8) M) caused a 26 +/- 4% inhibition of oxygen consumption (QO2); half-maximal inhibition occurred at 10(-11) M, suggesting a physiologic effect. This effect was not additive with either ouabain or amiloride, suggesting that it reflected inhibition of Na+ transport-dependent QO2. ANP(31-67) reduced the amphotericin-induced stimulation of QO2 consistent with inhibition by this peptide of the Na(+)-K(+)-ATPase. In addition, ANP(31-67) reduced ouabain-sensitive 86Rb+ uptake under Vmax conditions. Several lines of evidence indicated that PGE2, a known endogenous IMCD Na(+)-K(+)-ATPase inhibitor, mediates pump inhibition by ANP(31-67). Thus, ANP(31-67) inhibits Na+ transport by inhibiting the Na(+)-K(+)-ATPase of IMCD cells, an effect mediated by the generation of PGE2.

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Selected References

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