Multiple roles of hypoxia in ovarian function: roles of hypoxia-inducible factor-related and -unrelated signals during the luteal phase
Ryo Nishimura A B and Kiyoshi Okuda A C
+ Author Affiliations
- Author Affiliations
A Laboratory of Reproductive Endocrinology, Graduate School of Natural Science and Technology, Okayama University, 1-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japan.
B Present address: Laboratory of Theriogenology, Joint Department of Veterinary Medicine, Faculty of Agriculture, Tottori University, 4-101 Koyama-minami, Tottori 680-8550, Japan.
C Corresponding author. Email: kokuda@okayama-u.ac.jp
Reproduction, Fertility and Development 28(10) 1479-1486 https://doi.org/10.1071/RD15010
Submitted: 8 January 2015 Accepted: 13 March 2015 Published: 5 May 2015
Abstract
There is increasing interest in the role of oxygen conditions in the microenvironment of organs because of the discovery of a hypoxia-specific transcription factor, namely hypoxia-inducible factor (HIF) 1. Ovarian function has several phases that change day by day, including ovulation, follicular growth and corpus luteum formation and regression. These phases are regulated by many factors, including pituitary hormones and local hormones, such as steroids, peptides and cytokines, as well as oxygen conditions. Hypoxia strongly induces angiogenesis because transcription of the potent angiogenic factor vascular endothelial growth factor (VEGF) is regulated by HIF1. Follicular development and luteal formation are accompanied by a marked increase in angiogenesis assisted by HIF1–VEGF signalling. Hypoxia is also one of the factors that induces luteolysis by suppressing progesterone synthesis and by promoting apoptosis of luteal cells. The present review focuses on recent studies of hypoxic conditions, as well as HIF1-regulated genes and proteins, in the regulation of ovarian function.
Additional keywords: angiogenesis, apoptosis, corpus luteum, follicular development, luteal formation, luteal regression, steroidogenesis.
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