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The pentraxin serum amyloid P component is found in the male genital tract and attached to spermatozoa

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Author

Summary, in English

Serum amyloid P component (SAP) belongs to the pentraxin family of proteins, members of which are characterized by radial pentameric structure and calcium-dependent ligand binding. SAP is present in all types of amyloidosis and has been shown to bind to several ligands, but the physiological function of this protein has not been fully elucidated. The present study identified and characterized SAP in human semen and immunolocalized it to the male reproductive tract. SAP was also detected in seminal plasma by immunoblotting and purification by affinity chromatography followed by mass spectrometry. According to electroimmunoassay, the concentration of SAP in semen is approximately 2 mg/L, and flow cytometry revealed SAP attached to the surface of spermatozoa. Moreover, immunohistochemistry showed positive staining of spermatozoa, subsets of epithelial cells, and the stroma of accessory male genital glands and testis. Presence of mRNA supports local production of SAP, as shown with reverse transcription polymerase chain reaction. We identified SAP in a new setting - the human male reproductive system. SAP was detected on ejaculated spermatozoa, in seminal plasma and in tissue sections from the male reproductive tract. Further functional studies are needed to explain the role of SAP in human reproduction.

Publishing year

2008

Language

English

Pages

508-517

Publication/Series

International Journal of Andrology

Volume

31

Document type

Journal article

Publisher

Wiley-Blackwell

Topic

  • Obstetrics, Gynecology and Reproductive Medicine

Keywords

  • reproduction
  • semen
  • serum amyloid P component
  • spermatozoa
  • pentraxins

Status

Published

Research group

  • Clinical Chemistry, Malmö
  • Urological cancer, Malmö

ISBN/ISSN/Other

  • ISSN: 0105-6263