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Down-regulated let-7b-5p represses glycolysis metabolism by targeting AURKB in asthenozoospermia.
Gene 2018 July 16
Glycolysis, through anaerobic respiration, can supply energy for human sperm motility. MicroRNAs (miRNAs) could participate in the glycolytic pathway through regulating target genes. To investigate the potential role of glycolysis-related miRNAs in asthenozoospermia, TaqMan Low Density Array (TLDA) was used to screen potentially functional miRNAs, and seven glycolysis-related miRNAs were isolated to be related to asthenozoospermia. After qRT-PCR validation, only one seminal plasma miRNA, let-7b-5p, was found significantly decreased in severe asthenozoospermia cases compared with healthy controls. To further understand whether let-7b-5p is involved in asthenozoospermia by regulating the glycolytic pathway, we carried out gain-and-loss function study of let-7b-5p in GC-2 cells and detected the glycolytic activities. Our results showed that knocking down let-7b-5p could inhibit glycolytic activities. Besides, we also found overexpressed Aurkb (a target gene of let-7b-5p) could recapitulate the effects of knocking down let-7b-5p. Our findings indicated that low expression of let-7b-5p could repress glycolysis in asthenozoospermia by targeting AURKB.
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