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Study of the potential spermatogonial stem cell compartment in dogfish testis, Scyliorhinus canicula L.

Abstract : In the lesser-spotted dogfish (Scyliorhinus canicula), spermatogenesis takes place within spermatocysts made up of Sertoli cells associated with stage-synchronized germ cells. As shown in testicular cross sections, cysts radiate in maturational order from the germinative area, where they are formed, to the opposite margin of the testis, where spermiation occurs. In the germinative zone, which is located in a specific area between the tunica albuginea of the testis and the dorsal testicular vessel, individual large spermatogonia are surrounded by elongated somatic cells. The aim of this study has been to define whether these spermatogonia share characteristics with spermatogonial stem cells described in vertebrate and non-vertebrate species. We have studied their ultrastructure and their mitotic activity by 5′-bromo-2′-deoxyuridine (BrdU) incorporation and proliferating cell nuclear antigen (PCNA) immunodetection. Additionally, immunodetection of c-Kit receptor, a marker of differentiating spermatogonia in rodents, and of α- and β-spectrins, as constituents of the spectrosome and the fusome, has been performed. Ultrastructurally, nuclei of stage I spermatogonia present the same mottled aspect in dogfish as undifferentiated spermatogonia nuclei in rodents. Moreover, intercellular bridges are not observed in dogfish spermatogonia, although they are present in stage II spermatogonia. BrdU and PCNA immunodetection underlines their low mitotic activity. The presence of a spectrosome-like structure, a cytological marker of the germline stem cells in Drosophila, has been observed. Our results constitute the first step in the study of spermatogonial stem cells and their niche in the dogfish.
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Contributor : Pascal SOURDAINE Connect in order to contact the contributor
Submitted on : Wednesday, September 25, 2019 - 12:00:05 PM
Last modification on : Thursday, March 17, 2022 - 2:00:08 PM

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Géraldine Loppion, Amélie Crespel, Anne-Sophie Martinez, Pierrick Auvray, Pascal Sourdaine. Study of the potential spermatogonial stem cell compartment in dogfish testis, Scyliorhinus canicula L.. Cell and Tissue Research, 2008, 332 (3), pp.533-542. ⟨10.1007/s00441-008-0590-z⟩. ⟨hal-02296550⟩



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