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Recovering Spermatogenesis by Protected Cryopreservation Using Metformin and Transplanting Spermatogonial Stem Cells Into Testis in an Azoospermia Mouse Model Publisher Pubmed



Bashghareh A1 ; Rastegar T1 ; Modarresi P2 ; Kazemzadeh S3 ; Salem M1 ; Hedayatpour A1
Authors
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Authors Affiliations
  1. 1. Department of Anatomy, School of Medicine, Tehran University of Medical Science, Tehran, Iran
  2. 2. Department of Veterinary Medicine, Faculty of Veterinary Medicine, Islamic Azad University, Shabestar, Iran
  3. 3. Department of Anatomy, Faculty of Medicine, Shoushtar University of Medical Sciences, Shoushtar, Iran

Source: Biopreservation and Biobanking Published:2024


Abstract

Cryopreservation and transplantation of spermatogonial stem cells (SSCs) may serve as a new method to restore male fertility in patients undergoing chemotherapy or radiotherapy. However, SSCs may be damaged during cryopreservation due to the production of reactive oxygen species (ROS). Therefore, different antioxidants have been used as protective agents. Studies have shown that metformin (MET) has antioxidant activity. The aim of this study was to assess the antioxidant and antiapoptotic effects of MET in frozen-thawed SSCs. In addition, the effect of MET on the proliferation and differentiation of SSCs was evaluated. To this end, SSCs were isolated from mouse pups aged 3–6 days old, cultured, identified by flow cytometry (ID4, INTEGRIN b1+), and finally evaluated for survival and ROS rate. SSCs were transplanted after busulfan and cadmium treatment. Cryopreserved SSCs with and without MET were transplanted after 1 month of cryopreservation. Eight weeks after transplantation, the recipient testes were evaluated for the expression of apoptosis (BAX, BCL2), proliferation (PLZF), and differentiation (SCP3, TP1, TP2, PRM1) markers using immunohistochemistry, Western blot, and quantitative real-time polymerase chain reaction. The findings revealed that the survival rate of SSCs was higher in the 500 mm/mL MET group compared to the other groups (50 and 5000 mm/mL). MET significantly decreased the intracellular ROS production. Transplantation of SSCs increased the expression level of proliferation (PLZF) and differentiation (SCP3, TP1, TP2, PRM1) markers compared to azoospermia group, and their levels were significantly higher in the MET group compared to the cryopreservation group containing basic freezing medium (p < 0.05). MET increased the survival rate of SSCs, proliferation, and differentiation and decreased the ROS production and the apoptosis rate. Cryopreservation by MET seems to be effective in treating infertility. © Mary Ann Liebert, Inc.
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