Abstract
Introduction:
Sperm cryopreservation is a useful storage technique in artificial insemination. Nanoparticles and nanovesicles such as exosomes are widely used in sperm cryopreservation procedures to alleviate cold-induced injury inflicted during sperm freezing.
Objective:
The objective of the present study was to examine the impact of varying concentrations of exosomes derived from seminal plasma added to a freezing extender on the quality of post-thawed bull sperm.
Methods:
Five Holstein bulls were chosen based on their samples having less than 30% progressive motility. After exosome extraction, semen samples from bulls (n = 5) with progressive sperm motility ≤30% were collected, diluted with different exosome concentrations (0, 25, 50, and 100 μg/mL), and aspirated into 0.5 mL straws. After the freeze–thaw process, sperm total and progressive motility, viability, morphology, plasma membrane integrity, mitochondrial activity, and apoptosis status were assessed. Furthermore, the expression levels of annexin (ANX1), dystrophy-associated Fer-1-like protein (DYSF), fibronectin 1 (FN1), and reactive oxygen species modulator 1 (ROMO1) were evaluated via real-time polymerase chain reaction (PCR).
Results:
Adding different concentrations of exosomes (25, 50, and 150 μg/mL) significantly increased the progressive motility, viability, and membrane integrity of sperm compared with the control group (p < 0.05). For the apoptosis index, treatment with 100 μg/mL exosomes significantly increased the percentage of live cells (p < 0.05), while the percentage of necrotic cells decreased significantly (p < 0.05) compared with 25 μg/mL exosome. The results of quantitative PCR showed that the expression levels of ANX1 were significantly (p < 0.05) upregulated at 50 μg/mL exosome, and the expression of ROMO1, FN1, and DYSF were downregulated upon treatment with different exosome concentrations.
Conclusions:
In conclusion, supplementing the freezing diluent with exosome-derived seminal plasma could preserve the quality parameters of the post-thaw semen of the bull with low freezeability and could be used as a helpful method for reproductive programs.
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