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Endogenous prostaglandin E2 appears to play an important role in cardiovascular homeostasis. When administered exogenously, it is a potent vasodilator, but the requirement for intravenous administration and its short duration of action have limited studies to its acute effects. A novel prostaglandin E2 analogue, CL 115347, can be administered transdermally on a long-term basis. The cardiovascular responses to the chronic administration of CL 115347 were studied in a double-blind, placebo-controlled trial in 26 subjects with essential hypertension (16 given drug, 10 placebo) maintained on a 100-mEq sodium diet. Administration of CL 115347 produced a fall in diastolic blood pressure of 7.8 +/- 1.3 mm Hg, compared with a 2.3 +/- 1.7 mm Hg fall in controls (p = 0.02), with no change in heart rate. The direct vascular effect of the drug was confirmed by attenuation of the vasoconstrictor response to angiotensin II infusion (13.4 +/- 3.1 vs 21 +/- 2 mm Hg at 3.0 ng/kg/min; p less than 0.05). However, the chronic blood pressure effect of CL 115347 was modest. Subjects receiving active drug showed significant compensatory increases in plasma renin, aldosterone, and norepinephrine levels accompanied by sodium retention and kaliuresis. In summary, chronic administration of this prostaglandin E2 analogue resulted in a modest decrease in blood pressure and antagonism of angiotensin II-mediated vasoconstriction. However, its effects were largely offset by compensatory increases in vasoconstrictor hormones and sodium retention.

Prostaglandin E2 analogue elicits renal and hormonal compensatory mechanisms in human hypertension.