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Incomplete protection of genetic integrity of mature spermatozoa against oxidative stress.

机译:成熟的精子的遗传完整性对氧化应激的保护不充分。

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摘要

Although DNA damage in human spermatozoa is associated with adverse health effects, its origin is not fully understood. Therefore, we assessed biomarkers in ejaculates that retrospectively reflect processes that occurred in the epididymis or testis. Smoking increased the amount of DNA strand breaks (P<0.01), and enhanced the presence of vitamin C radicals in seminal plasma. In vitro, vitamin C protected mature spermatozoa against DNA damage, but this protection appeared to be insufficient in vivo. CAT and DDIT4 expression in spermatozoa were higher in smokers than in nonsmokers, but were not related to DNA damage. CAT and DDIT4 expression were inversely related with sperm count (P=0.039 and 0.024 resp.), but no effect was observed for SOD2 expression. These data indicate that spermatozoa of smokers encounter higher levels of oxidative stress. Expression of antioxidant enzymes and seminal vitamin C were insufficient to provide full protection of spermatozoa against DNA damage.
机译:尽管人类精子中的DNA损伤与不良健康影响有关,但其起源尚不完全清楚。因此,我们评估了射精中的生物标记物,这些标记物可追溯反映附睾或睾丸中发生的过程。吸烟增加了DNA链断裂的数量(P <0.01),并增强了精浆中维生素C自由基的存在。在体外,维生素C保护成熟的精子免受DNA损伤,但这种保护作用在体内似乎不足。吸烟者中精子中的CAT和DDIT4表达高于不吸烟者,但与DNA损伤无关。 CAT和DDIT4的表达与精子数量呈负相关(P = 0.039和0.024),但未观察到SOD2表达的影响。这些数据表明吸烟者的精子遇到较高水平的氧化应激。抗氧化酶和精子维生素C的表达不足以对精子提供全面保护,使其免受DNA损伤。

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