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Erschienen in: Endocrine 2/2020

22.04.2020 | Original Article

Longitudinal study of angiotensin peptides in normal and pre-eclamptic pregnancy

verfasst von: K. Bridget Brosnihan, David C. Merrill, Liliya M. Yamaleyeva, Kai Chen, Liomar Neves, JaNae Joyner, Courtney Givner, Kristy Lanier, Cheryl Moorefield, Brian Westwood

Erschienen in: Endocrine | Ausgabe 2/2020

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Abstract

Purpose

To address whether differential regulation of the renin-angiotensin-aldosterone system occurs in pre-eclampsia, we performed an analysis of the time course of circulating and urinary profiles of the vasoconstrictor (Ang II) and the vasodilator [Ang-(1–7)] peptides in normal pregnant (NP) and pre-eclamptic (PE) women.

Methods

Urine and plasma samples from 86 nulliparous women were collected prospectively; 67 subjects continued as NP and 19 developed PE. Subjects were enrolled prior to 12 weeks of gestation and plasma and spot urine samples were obtained throughout gestation. Control samples were obtained at 6 weeks postpartum (PP).

Results

Mean blood pressure (p < 0.001) was elevated at 31–37 weeks of gestation in PE subjects as compared with NP subjects. Plasma Ang I and Ang II levels were elevated in NP subjects as early as 16 weeks of gestation and maintained throughout gestation. In PE subjects both plasma Ang I and Ang II were elevated at 16–33 weeks as compared with PP levels. PE subjects showed reduced plasma Ang I and Ang II (at 35–37 weeks of gestation) compared with NP subjects. Plasma Ang-(1–7) was unchanged in both groups. All three urinary peptides increased throughout gestation in NP subjects. In PE subjects urinary Ang I was increased at 23–26 weeks and was maintained throughout gestation. Urinary Ang II was increased at 27–29 and 31–33 weeks of gestation. PE subjects had no change in urinary Ang-(1–7).

Conclusion

The activation of the RAS, particularly Ang II throughout normal gestation may contribute to the maintenance of vascular tone during normal pregnancy. However higher sensitivity to Ang II in pre-eclampsia may be potentiated by the higher circulating and urinary levels of Ang II, unopposed by local renal Ang-(1–7), and thus may contribute to the development of pre-eclampsia.
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Metadaten
Titel
Longitudinal study of angiotensin peptides in normal and pre-eclamptic pregnancy
verfasst von
K. Bridget Brosnihan
David C. Merrill
Liliya M. Yamaleyeva
Kai Chen
Liomar Neves
JaNae Joyner
Courtney Givner
Kristy Lanier
Cheryl Moorefield
Brian Westwood
Publikationsdatum
22.04.2020
Verlag
Springer US
Erschienen in
Endocrine / Ausgabe 2/2020
Print ISSN: 1355-008X
Elektronische ISSN: 1559-0100
DOI
https://doi.org/10.1007/s12020-020-02296-3

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