Volume 20 Issue 11
Nov.  2022
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YU Xiao-yan, WANG Lie-hong, YANG Hui-lin, MA Ying-lan, LI Yan-zi. Role of EZH2 in endometriosis-related infertility induced by oxidative stress in ovarian granulosa cells[J]. Chinese Journal of General Practice, 2022, 20(11): 1836-1840. doi: 10.16766/j.cnki.issn.1674-4152.002714
Citation: YU Xiao-yan, WANG Lie-hong, YANG Hui-lin, MA Ying-lan, LI Yan-zi. Role of EZH2 in endometriosis-related infertility induced by oxidative stress in ovarian granulosa cells[J]. Chinese Journal of General Practice, 2022, 20(11): 1836-1840. doi: 10.16766/j.cnki.issn.1674-4152.002714

Role of EZH2 in endometriosis-related infertility induced by oxidative stress in ovarian granulosa cells

doi: 10.16766/j.cnki.issn.1674-4152.002714
Funds:

 2019-q-051

  • Received Date: 2021-09-03
    Available Online: 2022-12-30
  •   Objective  To explore the role of enhancer of Zeste homologue 2 (EZH2) in ovarian granulosa cells (GCs) and oxidative stress (OS)-induced infertility related to endometriosis (EM).  Methods  The GCs were collected from 66 patients with deep invasive EM and 63 patients with tubal infertility (control group) in the Department of Reproductive Medicine, Qinghai Red Cross Hospital from April 2019 to November 2020. Flow cytometry was used in analysing the level of ROS in GCs. The COV434 cell model with low EZH2 expression was established in vitro and treated with H2O2. Cell senescence was measured by SA-β-gal. A mouse EM model was established, treated with an intraperitoneal injection of the EZH2 inhibitor DZNep and subjected to 6-month fertility test.  Results  Compared with the control group, the chronic pelvic pain score, dysmenorrhea pain score and serum CA-125 antigen significantly increased in the EM group (all P < 0.001), and the number of cells, average number of 2 PN embryos, average number of high-quality embryos and clinical pregnancy rate per embryo transfer cycle significantly decreased (all P < 0.001). Compared with control GCs, the intracellular ROS in GCs of patients with EM increased significantly (3.62±0.26 vs. 12.25±0.74, P < 0.001), and the expression levels of iNOS and SOD1 in the GCs decreased significantly (all P < 0.05). EZH2 knockdown significantly reversed H2O2-induced increase in ROS levels and SA-β-Gal activity (all P < 0.05) and down-regulated the expression of senescence-related proteins (all P < 0.05). The EM lesions in the EM+DZNep group was significantly smaller than those in the EM group [(433±74) mm3 vs. (1 624±182)mm3, P < 0.001], and the mean number of pups per delivery was significantly greater than in the EM group (all P < 0.05).  Conclusion  EZH2 is involved in EM-related infertility induced by GC cell OS.

     

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