2. Academic Validation
  3. Macrophage-derived extracellular vesicles regulate follicular activation and improve ovarian function in old mice by modulating local environment

Macrophage-derived extracellular vesicles regulate follicular activation and improve ovarian function in old mice by modulating local environment

  • Clin Transl Med. 2022 Oct;12(10):e1071. doi: 10.1002/ctm2.1071.
Yue Xiao 1 2,  Xiaoxu Peng 1 3,  Yue Peng 1,  Chi Zhang 1,  Wei Liu 1,  Weijie Yang 1 4,  Xiaowei Dou 1 5,  Yuying Jiang 1 6,  Yaxuan Wang 1,  Shuo Yang 1 6,  Wenpei Xiang 7,  Tinghe Wu 8,  Jing Li 1
Affiliations

Affiliations

  • 1 State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, Jiangsu, China.
  • 2 Women's Hospital School of Medicine Zhejiang University, Zhejiang, Hangzhou, China.
  • 3 Bayer Healthcare Company Limited, Pudong, Shanghai, China.
  • 4 Assisted Reproduction Unit, Department of Obstetrics and Gynecology, Sir Run Shaw Hospital, Zhejiang University School of Medicine, Key Laboratory of Reproductive Dysfunction Management of Zhejiang Province, Zhejiang, Hangzhou, China.
  • 5 Department of Obstetrics and Gynecology, The Second Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, China.
  • 6 Department of Immunology, Key Laboratory of Immunological Environment and Disease, Gusu School, State Key Laboratory of Reproductive Medicine, Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Personalized Cancer Medicine, Center for Global Health, Nanjing Medical University, Nanjing, Jiangsu, China.
  • 7 Family Planning Research Institute/Center of Reproductive Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China.
  • 8 State Key Laboratory of Translational Medicine and Innovative Drug Development, Jiangsu Simcere Pharmaceutical Co., Ltd., Nanjing, Jiangsu, China.
PMID: 36229897 DOI: 10.1002/ctm2.1071
Abstract

In mammals, ovarian function is dependent on the primordial follicle pool and the rate of primordial follicle activation determines a female's reproductive lifespan. Ovarian ageing is characterised by chronic low-grade inflammation with accelerated depletion of primordial follicles and deterioration of oocyte quality. Macrophages (Mφs) play critical roles in multiple aspects of ovarian functions; however, it remains unclear whether Mφs modulate the primordial follicle pool and what is their role in ovarian ageing. Here, by using super- or naturally ovulated mouse models, we demonstrated for the first time that ovulation-induced local inflammation acted as the driver for selective activation of surrounding primordial follicles in each estrous cycle. This finding was related to infiltrating Mφs in ovulatory follicles and the dynamic changes of the two polarised Mφs, M1 and M2 Mφs, during the process. Further studies on newborn ovaries cocultured with different subtypes of Mφs demonstrated the stimulatory effect of M1 Mφs on primordial follicles, whereas M2 Mφs maintained follicles in a dormant state. The underlying mechanism was associated with the differential regulation of the Phosphatidylinositol 3-kinase/Mechanistic target of rapamycin (PI3K/mTOR) signaling pathway through secreted extracellular vesicles (EVs) and the containing specific miRNAs miR-107 (M1 Mφs) and miR-99a-5p (M2 Mφs). In aged mice, the intravenous injection of M2-EVs improved ovarian function and ameliorated the inflammatory microenvironment within the ovary. Thus, based on the anti-ageing effects of M2 Mφs in old mice, M2-EVs may represent a new approach to improve inflammation-related infertility in women.

Keywords

extracellular vesicles; macrophage; ovarian ageing; primordial follicle.

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