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Cyclical changes in the renin‐angiotensin‐aldosterone system during the menstrual cycle of the baboon (Papio hamadryas)

Abstract: This study characterizes the renin‐angiotensin‐aldosterone system during the normal menstrual cycle in the baboon. Ten animals received a daily dose of an ACE inhibitor or placebo in a randomized blind cross‐over design. Data were obtained during the mid‐follicular and early luteal phases of normal non‐pregnant menstrual cycles. All examinations and blood collections were performed with ketamine sedation: 7–kg by im injection. Blood pressure was recorded by sphygmomanometer. Serum ACE activity was measured by spectrophotometry. Aldosterone (ALDO), angiotensin I (AI), and angiotensin II (AII) were measured by radioimmunoassay. Plasma renin activity (PRA) was measured by AI generation. The renin‐angiotensin‐aldosterone system was found to be activated in the follicular phase and suppressed during the luteal phase of the normal non‐pregnant menstrual cycle in the baboon.