miR‐34c works downstream of p53 leading to dairy goat male germline stem‐cell (<scp>mGSC</scp>s) apoptosis

Abstract

Abstract Objectives Recent lines of evidence have indicated that miR‐34c can play important roles in regulation of the cell cycle, cell senescence and apoptosis of mouse and human tumour cells, spermatogenesis, and male germ‐cell apoptosis. However, there is little information on the effects of miR‐34c on proliferation and apoptosis of livestock male germ cells. The dairy goat is a convenient domestic species for biological investigation and application. The purpose of this study was to investigate the effects of miR‐34c on apoptosis and proliferation of dairy goat male germline stem cells ( mGSC s), as well as to determine the relationship between p53 and miR‐34c in this species. Materials and methods Morphological observation, miRNA in situ hybridisation (ISH), bromodeoxyuridine staining, flow cytometry, quantitative‐RT‐PCR (Q‐RT‐PCR) and western blotting were utilized to ascertain apoptosis and proliferation of mGSC s, through transfection of miR‐34c mimics (miR‐34c), miR‐34c inhibitor (anti‐miR‐34c), miR‐34c mimics and inhibitors co‐transfected (mixture) compared to control groups. Results Results manifested that miR‐34c over‐expression promoted mGSC s apoptosis and suppressed their proliferation. Simultaneously, a variety of apoptosis‐related gene expression was increased while some proliferation‐related genes were downregulated. Accordingly, miR‐34c promoted apoptosis in mGSC s and reduced their proliferation; moreover, expression of miR‐34c was p53‐dependent. Conclusions This study is the first to provide a model for study of miRNAs and mechanisms of proliferation and apoptosis in male dairy goat germ cells.