Mitochondrial quality control disorder: a potential mechanism of male infertility

In recent years, the incidence of male infertility has increased to approximately 10%, with a continued upward trend. Therefore, understanding the mechanisms underlying male infertility and developing effective treatment strategies have become essential areas of focus. Mitochondria are regulated by a complex quality control system including mitochondrial dynamics, mitophagy and biogenesis, which not only maintains mitochondrial structural and functional integrity, but also supports the stability of testicular tissue and the intracellular environment necessary for male fertility. Several studies have demonstrated that dysfunction in mitochondrial dynamics and mitophagy is closely associated with a decline in male fertility. Disruptions caused by excessive external stimuli or gene mutations can impair these processes, resulting in oxidative damage, apoptosis, inflammation, and ferroptosis. These pathological changes ultimately damage testicular cells and tissues. Consequently, this review will focus on the two key mechanisms: mitochondrial dynamics and mitophagy. Furthermore, mitochondrial biogenesis-responsible for producing new mitochondria and regulating the number of mitochondria-also plays an important role in maintaining male fertility. Related studies have shown that mitochondrial biogenesis dysfunction can trigger a cascade of pathological events that lead to testicular tissue damage. In summary, this review systematically examines the roles of mitochondrial dynamics and mitophagy in regulating male fertility. It provides an in-depth analysis of the pathological mechanisms by which dysfunction in these processes leads to male infertility. Additionally, this review summarizes current therapeutic agents targeting mitochondrial dynamics and mitophagy, aiming to identify potential strategies for the clinical treatment of male infertility.