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Abstract
The freeze–thaw process results in reduced motility, viability and fertilization potential of human spermatozoa. So, a variety of substances were evaluated in order to enhance human sperm resistance to the stress of cryopreservation, such as Pentoxifylline (PTX) for improving the Intracytoplasmic sperm injection (ICSI) outcomes. The aim was to investigate the effect of PTX on sperm parameters and chromatin/DNA integrity of asthenozoospermic semen post vitrification. A total of 30 semen specimens were obtained from infertile men with asthenozoospermia. The cryoprotectant-free vitrification was performed for the samples after assessment of sperm parameters. After warming, each sample was exposed for 30 min to 3.6 mmol/l PTX in experimental group and the control group without any treatment apposing at 37 °C for 30 min in regard, to repeat all in vitro analysis (sperm parameters and DNA integrity assay). Regardless of the vitrification devastating impacts on sperm parameters, incubation of post vitrified samples with PTX increased the rate of progressive motility (P < 0.01). Moreover, PTX addition did not significantly damage DNA integrity of asthenozoospermic sperm samples. The data showed that PTX was able to improve sperm movement without any adverse effects on sperm chromatin/DNA integrity in vitrification program.
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