N-cadherin mechanosensing in ovarian follicles controls oocyte maturation and ovulation

Author:

Emery Alaknanda1,Blaschuk Orest W.2,Dinh Thao D.1,McPhee Tim1,Becker Rouven3,Abell Andrew D.3,Mrozik Krzysztof M.4,Zannettino Andrew C.W.4,Robker Rebecca L1,Russell Darryl L1ORCID

Affiliation:

1. Robinson Research Institute, Adelaide Medical School, The University of Adelaide

2. Zonula Incorporated

3. Department of Chemistry, The University of Adelaide

4. Myeloma Research Laboratory, Adelaide Medical School, Faculty of Health and Medical Sciences, The University of Adelaide

Abstract

The cell adhesion molecule N-cadherin (CDH2) is a membrane component of adherens junctions which regulates tissue morphogenesis and architecture. In the follicles of mammalian ovaries, N-cadherin adherens junctions are present between granulosa cells, cumulus cells and at the interface of cumulus cell transzonal projections and the oocyte. We demonstrate a mechanosensory role of N-cadherin integrating tissue structure and hormonal regulation of follicular morphogenic events including expansion of the cumulus oocyte complex (COC) matrix, oocyte maturation and ovulation. Two small molecule N-cadherin antagonists inhibited COC maturation in vitro . Transcriptome profiling revealed that targets of β-catenin and YAP1 pathways were dysregulated by N-cadherin antagonists. In vivo , N-cadherin antagonist significantly reduced ovulation in mice compared to controls (11 vs 26 oocytes/ovary; p=5.8×10 -6 ). Ovarian follicles exhibited structural dysgenesis with granulosa and cumulus cell layers becoming disorganised and the connection between cumulus cells and the oocyte disrupted and the transcriptome again indicated altered mechanical sensing causing dysregulation of the Hippo/YAP and β-catenin pathways and ECM reorganization. Granulosa specific N-cadherin depletion in Cdh2 Fl/FL ;Amhr2-Cre also showed significantly altered mechanosensitive gene expression and reduced ovulation. Our findings demonstrate a critical role for N-cadherin in ovarian follicular development and ovulation, and the potential to inhibit ovulation through targeting this signalling mechanism.

Publisher

eLife Sciences Publications, Ltd

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