Abstract
Male reproductive functions are mediated by different hormones whose orchestrations remain a major research interest. The ‘master’ regulator hormonal axis is the hypothalamo- pituitary-gonadal/testicular axis which is led by the pulsatile release of hypothalamic gonadotropin-releasing hormone. This, in turn, stimulates the anterior pituitary trophic hormones, the luteinizing hormone and follicle-stimulating hormone. Luteinizing hormone and follicle-stimulating hormone act upon the testicular cells, the Leydig cells for steroidogenesis and Sertoli cells to aid spermatogenesis, respectively. This primary axis is influenced by an array of other testicular hormones, metabolic hormones, and different regulatory factors. These hormonal crosstalks influence the intricate testicular functions, sexual behavior and semen quality in men. Given the growing concern in the last few decades over the increasing prevalence of male subfertility and/or infertility mostly in terms of deteriorating semen quality, it is required to find its underlying mechanisms. In this regard, the endocrine regulation of testicular functions is of prime importance in the determination of semen quality and sperm functions. This review article aims to present a concise updated overview on the mechanism by which the key hormones integrate the male reproductive functions and maintain the semen quality.
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