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Analysis of Epididymal Protein Synthesis and Secretion
10:23

Analysis of Epididymal Protein Synthesis and Secretion

Published on: August 25, 2018

ADAM7 is associated with epididymosomes and integrated into sperm plasma membrane

Jeong Su Oh1, Cecil Han, Chunghee Cho

  • 1Department of Life Science, Gwangju Institute of Science and Technology, Gwangju 500-712, Korea.

Molecules and Cells
|October 27, 2009
PubMed

Insights

Mammalian sperm gain proteins during epididymal transit. A disintegrin and metalloprotease (ADAM) 7 is secreted via epididymosomes and becomes an integral sperm membrane protein.

Area of Science:

  • Reproductive biology
  • Molecular and cell biology
  • Protein trafficking

Background:

  • Mammalian sperm undergo significant functional and compositional changes during epididymal transit.
  • Specific proteins secreted by the epididymis are acquired by sperm, crucial for fertilization.
  • A disintegrin and metalloprotease (ADAM) 7 was previously identified as an epididymis-specific protein transferred to sperm.

Purpose of the Study:

  • To investigate the secretion mechanism and sperm interaction of ADAM7 during epididymal transit.
  • To elucidate the role of epididymosomes in the transfer of ADAM7 to sperm.
  • To determine the localization of ADAM7 on the sperm surface.

Main Methods:

  • Immunofluorescence microscopy to visualize ADAM7 localization in epididymal tissues and sperm.
  • Biochemical assays to analyze the association of ADAM7 with epididymal vesicles.
  • Electron microscopy to study the morphology of epididymosomes and their interaction with sperm.

Main Results:

  • Mouse ADAM7 is secreted into the epididymal lumen associated with membranous vesicles, termed epididymosomes.
  • ADAM7 is directly transferred from epididymal epididymosomes to the surface of sperm.
  • ADAM7 integrates into the sperm plasma membrane, functioning as an integral membrane protein.

Conclusions:

  • ADAM7 utilizes epididymosomes for secretion and subsequent transfer to sperm during epididymal maturation.
  • This study reveals a unique mechanism of protein secretion and sperm-surface interaction involving ADAM7.
  • Understanding ADAM7's epididymal-to-sperm transfer provides insights into sperm functional maturation and potential fertility regulation.

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