Abstract
Since normal human pregnancy is characterized by normotension in the face of an increased renin-angiotensin-aldosterone system (RAAS), we evaluated the temporal pattern of urinary excretion of a novel vasodilator within this system, angiotensin-(1–7) (Ang-[1–7]), during the menstrual cycle, pregnancy, and lactation. The urinary profiles of Ang I, Ang II, human chorionic gonadotropin, 17β-estradiol, and progesterone were also determined. During the menstrual cycle, urinary Ang-(1–7) and Ang II remained stable (mean cycle value: 94.6±11.3 and 11.4±1.1 pmol/g of creatinine, respectively) in nine females. In 10 normal pregnant women, urinary Ang-(1–7) and Ang II increased throughout gestation, averaging 1499.8±310 and 224.4±58 pmol/g of creatinine, respectively (p<0.05) at wk 35 and falling during lactation to 394.0±95 and 65.7±20 pmol/g of creatinine (p<0.05), respectively. The Ang-(1–7)/Ang II ratio was unchanged in the different reproductive periods. During the menstrual cycle, Ang II and Ang-(1–7) correlated with 17β-estradiol and progesterone using multivariate analysis (r=0.31, p<0.001) and r=0.28, p<0.02, respectively). During gestation, 17β-estradiol and progesterone correlated with urinary Ang-(1–7) (r=0.48, p<0.001 and r=0.47, p<0.001, respectively) and Ang II (r=0.24, p<0.03 and r=0.25, p<0.03, respectively); by multiple regression, only Ang-(1–7) correlated with both steroids (r=0.49, p<0.001). The progressive rise of Ang-(1–7) throughout gestation, probably modulated by estrogen and progesterone, suggests a physiologic counterregulation within the RAAS.
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Valdés, G., Germain, A.M., Corthorn, J. et al. Urinary vasodilator and vasoconstrictor angiotensins during menstrual cycle, pregnancy, and lactation. Endocr 16, 117–122 (2001). https://doi.org/10.1385/ENDO:16:2:117
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DOI: https://doi.org/10.1385/ENDO:16:2:117