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Two Types of Assays for Detecting Frog Sperm Chemoattraction
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Equine sperm-neutrophil binding.

Abdorrahman S Alghamdi1, Scott Madill2, Douglas N Foster3

  • 1Departments of Agriculture and Natural Resources, University of Minnesota Crookston, Crookston, Minnesota algh0007@umn.edu.

Biology of Reproduction
|February 20, 2015
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Summary
This summary is machine-generated.

Seminal plasma proteins influence fertility by affecting sperm-neutrophil binding. This study investigated equine P-selectin and seminal plasma protein interactions with sperm, finding complex protein profiles that complicate identification.

Keywords:
P-selectinaccessory sex glandsmale organsneutrophilssperm

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Area of Science:

  • Reproductive biology
  • Immunology
  • Proteomics

Background:

  • Seminal plasma (SP) proteins can reduce fertility by promoting sperm-neutrophil binding in mares during repeated insemination.
  • The specific SP molecules responsible for this binding and their mechanism of action remain unidentified.
  • The complexity and variation of SP proteins present challenges in isolating beneficial molecules.

Purpose of the Study:

  • To investigate the role of equine P-selectin in sperm-neutrophil binding.
  • To characterize the binding of SP proteins to equine sperm and assess their affinity.
  • To compare protein profiles and effects on sperm function from individual male reproductive organs.

Main Methods:

  • Raised anti-equine P-selectin antibodies to test for P-selectin involvement in sperm-neutrophil binding.
  • Used biotinylated SP proteins incubated with sperm, followed by washing, electrophoresis, and avidin probing to assess binding affinity.
  • Collected secretions from individual male sex organs/glands to analyze protein profiles and effects on sperm motility and binding.

Main Results:

  • Anti-equine P-selectin antibodies identified the molecule but did not inhibit sperm-neutrophil binding; however, acrosome-reacted sperm showed a similar molecule.
  • Several SP proteins demonstrated strong affinity for sperm, resisting washing and separation techniques.
  • Secretions from individual organs exhibited varied effects on sperm motility and binding, but their protein profiles remained as complex as whole SP.

Conclusions:

  • Equine P-selectin is not the primary mediator of sperm-neutrophil binding, though a similar molecule is present on acrosome-reacted sperm.
  • Certain SP proteins bind strongly to sperm, offering potential targets for future identification and isolation.
  • Analyzing secretions from individual organs does not simplify the identification of SP molecules due to persistent proteomic complexity.