Abstract
The effects of diabetes mellitus (DM) on the quality and cytokine levels of human semen remain unknown. Sixty semen samples from 30 normal volunteers and 30 DM patients were assayed. The percentage of sperm progressive motility, sperm vitality, sperm survival rate, the rate of normal sperm morphology, semen volume, and semen pH and density of DM males were significantly lower than those of normal males (p<0.05). Moreover, semen interleukin (IL)-17 and IL-18 levels in DM males were significantly higher than those in normal males (p<0.05) and were positively correlated with blood glucose level and sperm DNA fragmentation index. DM increased blood glucose levels, consequently inducing the abnormal expression of IL-17 and IL-18. The abnormal expression of these cytokines in semen decreased semen quality and might lead to male infertility.
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