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Vertebrate reproductive science and technology
RESEARCH ARTICLE

Restraint stress and elevation of corticotrophin-releasing hormone in female mice impair oocyte competence through activation of the tumour necrosis factor α (TNF- α) system

Xin-Yue Zhao A , Zhi-Bin Li A , Hong-Jie Yuan A , Xiao Han A , Jia-Shun Wu A , Xiu-Yun Feng A , Min Zhang A and Jing-He Tan https://orcid.org/0000-0001-6437-6259 A B
+ Author Affiliations
- Author Affiliations

A Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, College of Animal Science and Veterinary Medicine, Shandong Agricultural University, Tai’an City 271018, P. R. China.

B Corresponding author. Email: tanjh@sdau.edu.cn

Reproduction, Fertility and Development 32(9) 862-872 https://doi.org/10.1071/RD20002
Submitted: 4 January 2020  Accepted: 9 April 2020   Published: 28 May 2020

Abstract

Studies have observed that restraint stress (RS) and the associated elevation in corticotrophin-releasing hormone (CRH) impair oocyte competence by triggering apoptosis of ovarian cells but the underlying mechanisms are largely unclear. Although one study demonstrated that RS and CRH elevation triggered apoptosis in ovarian cells and oocytes via activating Fas/FasL signalling, other studies suggested that RS might damage cells by activating other pathways as well as Fas signalling. The objective of this study was to test whether RS and CRH elevation impairs oocytes by activating tumour necrosis factor α (TNF-α) signalling. Our in vivo experiments showed that RS applied during oocyte prematuration significantly increased expression of TNF-α and its receptor (TNFR1) while inducing apoptosis in both oocytes and mural granulosa cells (MGCs). In vitro treatment of MGCs with CRH significantly increased their apoptotic percentages and levels of TNF-α and TNFR1 expression. In vitro knockdown by interfering RNA, in vivo knockout of the TNF-α gene or injection of TNF-α antagonist etanercept significantly relieved the adverse effects of RS and CRH on apoptosis of MGCs and/or the developmental potential and apoptosis of oocytes. The results suggest that RS and CRH elevation in females impair oocyte competence through activating TNF-α signalling and that a TNF-α antagonist might be adopted to ameliorate the adverse effects of psychological stress on oocytes.

Graphical Abstract Image

Additional keywords: apoptosis, psychological stress, TNF-α signaling.


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