Elevation of (Pro)Renin and (Pro)Renin Receptor in Preeclampsia

OBJECTIVE Preeclampsia (preE), a syndrome of hypertension, proteinuria, and edema, has many elusive triggers. The renin–angiotensin system has been implicated in preE pathogenesis. In this study, we test the hypothesis that (pro)renin levels are increased in preE patients and that levels of (pro)ren...

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Bibliographic Details
Published in:American journal of hypertension 2015-10, Vol.28 (10), p.1277-1284
Main Authors: Thomason, Jessica, Reyes, Michelle, Allen, Steven R., Jones, Richard O., Beeram, Madhava R., Kuehl, Thomas J., Suzuki, Fumiaki, Uddin, Mohammad Nasir
Format: Article
Language:English
Subjects:
Adolescent
Adult
Animals
Case-Control Studies
Disease Models, Animal
Female
Humans
Immunohistochemistry
Kidney - metabolism
Placenta - metabolism
Pre-Eclampsia - blood
Pregnancy
Rats
Receptors, Cell Surface - blood
Renin - blood
Up-Regulation
Young Adult
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Summary:OBJECTIVE Preeclampsia (preE), a syndrome of hypertension, proteinuria, and edema, has many elusive triggers. The renin–angiotensin system has been implicated in preE pathogenesis. In this study, we test the hypothesis that (pro)renin levels are increased in preE patients and that levels of (pro)renin and (pro)renin receptor ((P)RR) are elevated in a rat model of preE. METHODS We recruited 30 preE and 43 normal pregnant consenting patients. We used normally pregnant rats (NP, n = 10) and pregnant rats receiving weekly injections of desoxycorticosterone acetate and whose drinking water was replaced with 0.9% saline (preE, n = 10). Plasma and placental levels of (pro)renin were assayed by ELISA. Placental and kidney (P)RR was measured both by immunoblotting and immunohistochemistry. RESULTS The mean plasma (pro)renin of 27.1±5.2 in preE patients differs from that in patients without preE: 14.8±5.2ng Ang I/ml/hour (P < 0.0001). In rats, both plasma (NP: 22.7±4.3 and preE: 49.2±10.0ng Ang I/ml/hour) and placental (NP: 152±24 and preE: 302±39ng/g tissue) levels of (pro)renin were higher (P < 0.001) in preE compared to NP rats. (P)RR expression was greater (P < 0.05) in placental tissue of preE rats, while kidney (P)RR expression was similar. CONCLUSION Elevated levels of circulating (pro)renin have been observed in preE patients and in a rat model of preE. We also found the increased expression of placental (P)RR in preE rats.
ISSN:0895-7061
1941-7225
DOI:10.1093/ajh/hpv019