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Valentin, J.P. et al.

Inhibition of neutral endopeptidase amplifies the effects of endogenous atrial natriuretic peptide on blood pressure and fluid partition.

Neutral endopeptidase (EC 3.4.24.11) is a wide-spread enzyme that degrades atrial natriuretic peptide ( ANP). We studied the effects of a potent neutral endopeptidase inhibitor, SQ 28,603, given intravenously (30 mg/kg over 45 min) to anesthetized, bilaterally nephrectomized Sprague-Dawley rats. Infusion of vehicle alone was accompanied by a modest increase, 3.2 +/- 2.2% (mean +/- SE), in mean arterial blood pressure (MAP) and a slight rise in hematocrit (Hct) of 0.9 +/- 0.7%. After administration of SQ 28,603, MAP fell 3.2 +/- 0.5%, and Hct rose 4.9 +/- 0.5%, both significantly different from the changes with vehicle alone; the lesser increase in plasma protein concentration (2.5 +/- 0.4%) suggested an increase in vascular permeability to both plasma protein and fluid similar to that caused by ANP. When SQ 28,603 was given to rats pretreated with rabbit antirat ANP antiserum, blood pressure rose by 3.8 +/- 0.5%, and Hct increased by 1.0 +/- 0.4%, values very similar to those observed with vehicle alone. Inhibition of neutral endopeptidase therefore amplifies the actions of endogenous ANP on blood pressure and fluid partition.[1]

References

Inhibition of neutral endopeptidase amplifies the effects of endogenous atrial natriuretic peptide on blood pressure and fluid partition. Valentin, J.P., Qiu, C.B., Wiedemann, E., Gardner, D., Humphreys, M.H. Am. J. Hypertens. (1992) [Pubmed]

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