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Vertebrate reproductive science and technology
REVIEW

Epigenetic regulation of progesterone receptors and the onset of labour

Marina Ilicic A B E , Tamas Zakar C D E F and Jonathan W. Paul https://orcid.org/0000-0003-3064-6358 C D E G
+ Author Affiliations
- Author Affiliations

A School of Biomedical Sciences and Pharmacy, Faculty of Health and Medicine, University of Newcastle, University Drive, Callaghan, NSW 2308, Australia.

B Priority Research Centre for Stroke and Brain Injury, University of Newcastle, University Drive, Callaghan, NSW 2308, Australia.

C School of Medicine and Public Health, Faculty of Health and Medicine, University of Newcastle, University Drive, Callaghan, NSW 2308, Australia.

D Priority Research Centre for Reproductive Science, University of Newcastle, University Drive, Callaghan, NSW 2308, Australia.

E Hunter Medical Research Institute, 1 Kookaburra Circuit, New Lambton Heights, NSW 2305, Australia.

F John Hunter Hospital, Lookout Road, New Lambton Heights, NSW 2305, Australia.

G Corresponding author. Email: jonathan.paul@newcastle.edu.au

Reproduction, Fertility and Development 31(6) 1035-1048 https://doi.org/10.1071/RD18392
Submitted: 2 October 2018  Accepted: 29 January 2019   Published: 4 April 2019

Abstract

Progesterone plays a crucial role in maintaining pregnancy by promoting myometrial quiescence. The withdrawal of progesterone action signals the end of pregnancy and, in most mammalian species, this is achieved by a rapid fall in progesterone concentrations. However, in humans circulating progesterone concentrations remain high up to and during labour. Efforts to understand this phenomenon led to the ‘functional progesterone withdrawal’ hypothesis, whereby the pro-gestation actions of progesterone are withdrawn, despite circulating concentrations remaining elevated. The exact mechanism of functional progesterone withdrawal is still unclear and in recent years has been the focus of intense research. Emerging evidence now indicates that epigenetic regulation of progesterone receptor isoform expression may be the crucial mechanism by which functional progesterone withdrawal is achieved, effectively precipitating human labour despite high concentrations of circulating progesterone. This review examines current evidence that epigenetic mechanisms play a role in determining whether the pro-gestation or pro-contractile isoform of the progesterone receptor is expressed in the pregnant human uterus. We explore the mechanism by which these epigenetic modifications are achieved and, importantly, how these underlying epigenetic mechanisms are influenced by known regulators of uterine physiology, such as prostaglandins and oestrogens, in order to phenotypically transform the pregnant uterus and initiate labour.

Additional keywords: DNA methylation, histone modifications, histone-modifying enzymes, parturition.


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