Testosterone-immunopositive primordial germ cells in the testis of the bullfrog, Rana catesbeiana

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dc.contributor.authorSasso-Cerri, Estela [UNIFESP]
dc.contributor.authorFreymüller-Haapalainen, Edna [UNIFESP]
dc.contributor.authorMiraglia, Sandra Maria [UNIFESP]
dc.contributor.institutionUniv Estadual São Paulo UNESP
dc.contributor.institutionUniversidade Federal de São Paulo (UNIFESP)
dc.date.accessioned2016-01-24T12:37:52Z
dc.date.available2016-01-24T12:37:52Z
dc.date.issued2005-06-01
dc.description.abstractIn amphibia, steroidogenesis remains quiescent in distinct seasonal periods, but the mechanism by which spermatogenesis is maintained under low steroidogenic conditions is not clear. in the present study, testosterone location in the testes of Rana catesbeiana was investigated immunohistochemically during breeding (summer) and nonbreeding (winter) periods. in winter, the scarce interstitial tissue exhibited occasional testosterone immunopositivity in the interstitial cells but the cytoplasm of primordial germ cells (PG cells) was clearly immunopositive. By contrast, in summer, PG cells contained little or no immunoreactivity whereas strong immunolabelling was present in the well-developed interstitial tissue. These results suggest that PG cells could retain testosterone during winter. This androgen reservoir could be involved in the control of early spermatogenesis in winter and/or to guarantee spermiogenesis and spermiation in the next spring/summer. the weak or negative immunoreaction in the summer PG cells might reflect consumption of androgen reservoir by the intense spermatogenic activity from spring to summer. Thus, besides acting as stem cells, PG cells of R. catesbeiana could exert an androgen regulatory role during seasonal spermatogenesis.en
dc.description.affiliationUniv Estadual São Paulo UNESP, Sch Dent, Dept Morphol, BR-14801903 Araraquara, SP, Brazil
dc.description.affiliationUniversidade Federal de São Paulo UNIFESP, Ctr Electron Microscopy, São Paulo, Brazil
dc.description.affiliationUniversidade Federal de São Paulo UNIFESP, Dept Morphol, São Paulo, Brazil
dc.description.affiliationUnifespUniversidade Federal de São Paulo UNIFESP, Ctr Electron Microscopy, São Paulo, Brazil
dc.description.affiliationUnifespUniversidade Federal de São Paulo UNIFESP, Dept Morphol, São Paulo, Brazil
dc.description.sourceWeb of Science
dc.format.extent519-523
dc.identifierhttp://dx.doi.org/10.1111/j.1469-7580.2005.00419.x
dc.identifier.citationJournal of Anatomy. Oxford: Blackwell Publishing, v. 206, n. 6, p. 519-523, 2005.
dc.identifier.doi10.1111/j.1469-7580.2005.00419.x
dc.identifier.issn0021-8782
dc.identifier.urihttp://repositorio.unifesp.br/handle/11600/28315
dc.identifier.wosWOS:000229581000001
dc.language.isoeng
dc.publisherBlackwell Publishing
dc.relation.ispartofJournal of Anatomy
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectamphibiaen
dc.subjectandrogenen
dc.subjectimmunohistochemistryen
dc.subjectinterstitial cellsen
dc.subjectseasonal spermatogenesisen
dc.subjectstem cellsen
dc.titleTestosterone-immunopositive primordial germ cells in the testis of the bullfrog, Rana catesbeianaen
dc.typeinfo:eu-repo/semantics/article
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