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Exogenous neurotensin modulates sperm function in Japanese Black cattle
Kohei Umezu1, Yuuki Hiradate, Toshinori Oikawa
1Laboratory of Animal Reproduction and Development, Graduate School of Agricultural Science, Tohoku University, Miyagi 981-8555, Japan.
The Journal of Reproduction and Development
|May 24, 2016
Summary
Neurotensin (NT) enhances bovine sperm capacitation and acrosome reaction, crucial for improving artificial insemination success rates. This peptide signaling pathway is vital for regulating sperm function in cattle.
Area of Science:
- Reproductive Biology
- Animal Science
- Molecular Endocrinology
Background:
- Declining conception rates in artificial insemination necessitate improved sperm quality control.
- Mechanisms regulating bovine sperm function, particularly capacitation and acrosome reaction, remain incompletely understood.
- Neurotensin (NT) is known to enhance sperm capacitation and acrosome reaction in mice.
Purpose of the Study:
- To investigate the role of neurotensin (NT) in regulating bovine sperm function.
- To confirm the presence of NT and its receptor (NTR1) in the bovine reproductive tract and sperm.
- To determine the effects of exogenous NT on bovine sperm capacitation, acrosome reaction, and motility.
Main Methods:
- Confirmation of neurotensin receptor 1 (NTR1) expression in bovine sperm.
- Measurement of NT secretion in bovine uterine and oviductal fluids.
- In vitro assessment of NT's effects on bovine sperm protein tyrosine phosphorylation (capacitation marker).
- Evaluation of NT's impact on acrosome reaction in capacitated sperm.
- Computer-aided sperm analysis (CASA) to assess motility.
Main Results:
- Neurotensin receptor 1 (NTR1) is expressed in bovine sperm, and NT is secreted in the uterus and oviduct.
- Exogenous NT significantly induced sperm protein tyrosine phosphorylation in a dose-dependent manner, indicating enhanced capacitation.
- NT facilitated the acrosome reaction in capacitated bovine sperm in a dose-dependent manner.
- NT did not significantly affect bovine sperm motility.
Conclusions:
- Neurotensin (NT) acts as a key facilitator of sperm capacitation and acrosome reaction in cattle.
- The NT-mediated signaling pathway plays a conserved role in regulating sperm function in mammals.
- Understanding NT's role can lead to strategies for improving sperm quality and artificial insemination efficiency.
