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LY6A/E (SCA-1) expression in the mouse testis.

Maaike P A van Bragt1, Nadia Ciliberti, William L Stanford

  • 1Department of Endocrinology, Faculty of Biology, Utrecht University, The Netherlands. m.vanbragt@bio.uu.nl

Biology of Reproduction
|June 3, 2005
PubMed
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LY6A (stem cell antigen-1) is not expressed on spermatogonial stem cells. Studies show LY6A is present in testicular interstitial cells, but Ly6a knockout mice exhibit normal testis development and spermatogenesis.

Area of Science:

  • Reproductive Biology
  • Stem Cell Biology
  • Immunology

Background:

  • LY6A, also known as stem cell antigen-1 (SCA-1), is expressed on testicular side population (SP) cells.
  • The identity of LY6A-positive SP cells as spermatogonial stem cells is debated.

Purpose of the Study:

  • To investigate the expression pattern of LY6A in the testis.
  • To determine the function of LY6A in spermatogenesis and testis development.

Main Methods:

  • Immunohistochemistry was used to analyze LY6A expression in testicular interstitial tissue.
  • The testes of Ly6a knockout mice (Ly6a(-/-)) were examined for morphological and cellular differences.

Main Results:

  • LY6A was found in interstitial cells, including peritubular myoid, endothelial, and peritubular mesenchymal cells.

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  • No morphological abnormalities or significant differences in spermatogonia, spermatocytes, Leydig cells, or macrophages were observed in Ly6a(-/-) mice.

    • Conclusions:

    • LY6A expression does not impact testis development or spermatogenesis.
    • Spermatogonial stem cells are LY6A negative, clarifying their identity.