Placental expression of adenosine A2A receptor and hypoxia inducible factor-1 alpha in early pregnancy, term and pre-eclamptic pregnancies: interactions with placental renin-angiotensin system

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Kurlak, L.O., Williams, Paula Juliet, Bulmer, Judith N., Broughton Pipkin, Fiona and Mistry, Hiten D. (2015) Placental expression of adenosine A2A receptor and hypoxia inducible factor-1 alpha in early pregnancy, term and pre-eclamptic pregnancies: interactions with placental renin-angiotensin system. Placenta, 36 (5). pp. 611-613. ISSN 1532-3102

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Official URL: http://www.sciencedirect.com/science/article/pii/S0143400415008103

Abstract

Normal placentation occurs under low oxygen tensions yet hypoxia is also implicated in placental pathologies such as pre-eclampsia (PE). Hypoxia-inducible factors (HIFs), adenosine and tissue renin-angiotensin-system (RAS) are known to promote angiogenesis and vascularisation. We hypothesised that placental adenosine A2AR receptor and HIF-1α would change through pregnancy in association with the RAS. Placentae were obtained from women undergoing elective surgical termination of pregnancy (TOP) at ≤10 weeks’ (early TOP) and >10 weeks’ (mid TOP) gestations; at delivery from normotensive (NT) and PE pregnancy. Results were compared to our previously reported data on the angiotensin receptors: AT1R, AT2R and AT4R.

Protein expression of both A2AR and HIF-1α was highest in early TOP and positively correlated through pregnancy (P<0.0001): expression was higher in PE than NT at delivery (P<0.0001 for both). The A2AR positively correlated with the AT4R in placentae in early pregnancy (r=0.53; P=0.035), but not in 3rd trimester samples. Our findings suggest a role for adenosine and RAS in promoting placentation and as a potential adaptation to poor placental perfusion in pre-eclampsia.

Item Type:	Article
Keywords:	Placental A2AR; HIF-1α: angiotensin receptors; Early pregnancy; Pre-eclampsia
Schools/Departments:	University of Nottingham, UK > Faculty of Medicine and Health Sciences > School of Medicine > Division of Child Health, Obstetrics and Gynaecology University of Nottingham, UK > Faculty of Medicine and Health Sciences > School of Veterinary Medicine and Science
Identification Number:	https://doi.org/10.1016/j.placenta.2015.02.011
Depositing User:	Mistry, Hiten
Date Deposited:	21 Jul 2017 10:17
Last Modified:	12 Oct 2017 23:34
URI:	https://eprints.nottingham.ac.uk/id/eprint/44329

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