Abstract
Male infertility is due to genetics, hormonal or environmental causes, or is idiopathic. Azoospermia is linked to local testicular microenvironment deregulation, with inflammatory cells present in the 15% of testicular biopsies of infertile patients. As widely reported, spermatogenesis and steroidogenesis are controlled by local immunoregulatory agents produced by immune and nonimmune cells. Moreover IL-6R, TNFR1, Fas and IL-1R are expressed on germ cells, indicating a direct action of pro-inflammatory agents on these cells. Beyond the known function of cytokines and nitric oxide on testicular function at the stable levels present in the normal testis, this review focalises on the effect of pro-inflammatory factors on germ cell survival and death when inflammatory conditions are established in the testis. As no cure for male infertility has been found up to the present, intracytoplasmic sperm injection is the therapeutic option for azoospermic patients who wish to achieve genetic parenthood. Therapies with antioxidant and anti-inflammatory agents in experimental models of testicular damage have been successful. However, clinical implementation is uncertain in cases with a prolonged inflammatory state of the testis. Therapies offering multiple approaches to treat infertility by restoring the spermatogonial stem cell niche and protecting germ cells from apoptosis should be considered.
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