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Substance P and beta-endorphin act as possible chemoattractants of mouse sperm
1Jagiellonian University School of Medicine, Department of Biology, Kraków, Poland.
Abstract:
The effect of beta-endorphin and substance P on mouse sperm motion was examined in an in vitro model. The number of mouse sperm cells migrating to mediuin containing substance P in pharmacological concentrations of 5, 25, and 50 ng/mL were significantly higher than the number migrating to control. This effect was observed after 3 h at a concentration of 5 ng/mL and 1 h at 25 and 50 ng/mL. Demonstrated changes in spermatozoa behavior in the presence of substance P were time and concentration dependent. These effects were interpreted as chemotaxis but not chemokinesis of sperm induced by influence of this tachykinin on membrane receptors. The presence of beta-endorphin in incubation fluid in concentrations of 5, 25, and 50 ng/mL did not cause any visible changes or decrease sperm migration. Substance P contained in follicular fluid played a direct and important role in the process of mammalian fertilization.
Insights
Substance P significantly enhances mouse sperm migration in a time- and dose-dependent manner, indicating a role in mammalian fertilization. Beta-endorphin showed no effect on sperm motility.
Area of Science:
- Reproductive Biology
- Neuroendocrinology
- Cellular Signaling
Background:
- Sperm motility is crucial for mammalian fertilization.
- The role of neuropeptides like Substance P and beta-endorphin in sperm function is not fully understood.
Purpose of the Study:
- To investigate the in vitro effects of Substance P and beta-endorphin on mouse sperm motion.
- To determine if these neuropeptides influence sperm migration and fertilization processes.
Main Methods:
- An in vitro model was used to assess mouse sperm migration.
- Spermatozoa were exposed to varying concentrations (5, 25, 50 ng/mL) of Substance P and beta-endorphin.
- Migration to control and peptide-containing media was quantified over time.
Main Results:
- Substance P significantly increased sperm migration in a concentration- and time-dependent manner.
- The observed effect was identified as chemotaxis, suggesting Substance P influences sperm via membrane receptors.
- Beta-endorphin did not affect sperm migration at any tested concentration.
Conclusions:
- Substance P plays a direct and significant role in mammalian fertilization by promoting sperm migration.
- The findings highlight Substance P's importance in the follicular fluid environment during fertilization.
- Beta-endorphin does not appear to influence sperm motility in this context.