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Acute coadministrations of an inhibitor of endopeptidase 24.11 (thiorphan) and a ligand (SC-46542) selective for the non-guanylate cyclase-linked atriopeptin binding sites increases urinary sodium excretion to a greater degree in conscious spontaneously hypertensive rats than in normotensive Wistar-Kyoto rats. In the present study, we examined the effects of chronic 10-day intravenous infusions of SC-46542 (des[Phe106,Gly107,Ala115,Gln116] atriopeptin-(103-126] (0.1 mg/kg/hr), thiorphan (1.5 mg/kg/hr), and atriopeptin-(103-126) (100 ng/hr) alone or in combination on direct recording of mean arterial pressure in conscious spontaneously hypertensive rats. During an 11-day time-control infusion of isotonic saline vehicle (100 microliters/hr), mean arterial pressure remained stable. Chronic infusion of atriopeptin-(103-126) decreased mean arterial pressure progressively over the first 3 days; then mean arterial pressure progressively rose to control level over the following 3 days and remained at control level for the remainder of the experiment. Similarly, coinfusions of atriopeptin-(103-126) and SC-46542 or thiorphan, SC-46542 and thiorphan, or the triple infusion of atriopeptin-(103-126), SC-46542, and thiorphan had only transient effects on mean arterial pressure during 10-day infusions. SC-46542 alone had no effect on mean arterial pressure. Similarly, thiorphan alone had no effect on mean arterial pressure except at doses that blocked the acute pressor response to angiotensin I. Chronic infusions of atriopeptin-(103-126), SC-46542, and thiorphan alone or in combination are not effective long-term treatments for hypertension in spontaneously hypertensive rats.

Chronic atriopeptin regulation of arterial pressure in conscious hypertensive rats.