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Compartmentalization of prion isoforms within the reproductive tract of the ram

Heath Ecroyd1, Pierre Sarradin, Jean-Louis Dacheux

  • 1Gamètes Males et Fertilité, UMR 6175 INRA-CNRS-Université de Tours-Haras Nationaux, Station de Physiologie de la Reproduction et des Comportements, 37380 Nouzilly, France.

Biology of Reproduction
|May 28, 2004
PubMed

Insights

Cellular prion protein (Prp(C)) is found in male reproductive fluids and on sperm. A specific truncated form associates with sperm during maturation, potentially playing a role in sperm development.

Area of Science:

  • Reproductive Biology
  • Neuroscience
  • Biochemistry

Background:

  • Cellular prion protein (Prp(C)) is a membrane-associated glycoprotein.
  • Its pathogenic form (Prp(SC)) causes transmissible neurodegenerative spongiform encephalopathies.
  • Prp(C) has been detected in male reproductive systems.

Purpose of the Study:

  • To investigate the presence and localization of Prp(C) isoforms within the ram reproductive tract.
  • To determine the association of Prp(C) with sperm during maturation.
  • To explore the potential role of Prp(C) in sperm function.

Main Methods:

  • Immunoblotting using antibodies against different Prp(C) sequences.
  • Analysis of cauda epididymal fluid, seminal plasma, and sperm from different reproductive tract sections.
  • Investigation of Prp(C) association with sperm cytoplasmic droplets and lipid rafts.

Main Results:

  • Prp(C) isoforms, including full-length and truncated forms, are present in ram cauda epididymal fluid and seminal plasma.
  • These isoforms exist in both soluble and vesicle-associated forms (epididymosomes).
  • A specific 25 kDa C-terminally truncated Prp(C) isoform is consistently found on sperm from testis to semen, and in cytoplasmic droplets.

Conclusions:

  • Prp(C) isoforms are compartmentalized within the male reproductive tract.
  • A specific truncated Prp(C) isoform is associated with sperm throughout maturation.
  • This association with sperm lipid rafts suggests a role in terminal sperm maturation stages.

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