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Apoptosis, proliferation and presence of estradiol receptors in the testes and Bidder's organ of the toad Rhinella arenarum (Amphibia, Anura).
Scaia, María Florencia; Czuchlej, Silvia Cristina; Cervino, Nadia; Ceballos, Nora Raquel.
Afiliação
  • Scaia MF; Laboratorio De Endocrinología Comparada, Departamento De Biodiversidad Y Biología Experimental, Facultad De Ciencias Exactas Y Naturales, Universidad De Buenos Aires, Consejo Nacional De Investigaciones Científicas Y Técnicas, Buenos Aires, Argentina.
  • Czuchlej SC; Laboratorio De Endocrinología Comparada, Departamento De Biodiversidad Y Biología Experimental, Facultad De Ciencias Exactas Y Naturales, Universidad De Buenos Aires, Consejo Nacional De Investigaciones Científicas Y Técnicas, Buenos Aires, Argentina.
  • Cervino N; Laboratorio De Endocrinología Comparada, Departamento De Biodiversidad Y Biología Experimental, Facultad De Ciencias Exactas Y Naturales, Universidad De Buenos Aires, Consejo Nacional De Investigaciones Científicas Y Técnicas, Buenos Aires, Argentina.
  • Ceballos NR; Laboratorio De Endocrinología Comparada, Departamento De Biodiversidad Y Biología Experimental, Facultad De Ciencias Exactas Y Naturales, Universidad De Buenos Aires, Consejo Nacional De Investigaciones Científicas Y Técnicas, Buenos Aires, Argentina.
J Morphol ; 277(4): 412-23, 2016 Apr.
Article em En | MEDLINE | ID: mdl-26719144
The dynamic equilibrium between spermatogonial proliferation and testicular apoptosis determines the progression of spermatogenesis in amphibians. Estrogens and their receptors play a central role in regulating spermatogenesis in vertebrates, and in some species of anurans, estradiol (E2 ) is involved in the regulation of spermatogonial proliferation and apoptosis of germ cells. Bidder's organ (BO) is a structure characteristic of Bufonidae that has historically been compared to an undeveloped ovary. In adult Rhinella arenarum males, BO is one of the main sources of plasma E2 . The aim of this study was 1) to describe the seasonal variations in testicular apoptosis, spermatogonial proliferation, and cellular proliferation in BO; and 2) to analyze the presence and localization of estrogen receptor ß (ERß) in the testes and BO of R. arenarum. Testicular fragments and BOs from animals collected during the year were labeled with 5-bromo-2'-deoxyuridine (BrdU) and BrdU incorporation was determined using immunohistochemistry. Apoptosis in testicular sections was detected using the TUNEL method, and ERß localization was assessed using immunohistochemistry in testes and BOs. The results indicate that spermatogonial proliferation is highest during the reproductive season and that cysts of spermatocytes and spermatids undergo apoptosis during the postreproductive season. Furthermore, the proliferation of follicular cells is highest during the reproductive and postreproductive seasons. ERß was primarily detected by immunolocalization in Sertoli cells, follicular cells, and oocytes. Taken together, these results suggest that cysts that do not form spermatozoa are removed from testes by apoptosis and that estrogens regulate both spermatogenesis and oogenesis in adult males of R. arenarum.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Espermatogênese / Testículo / Bufonidae / Apoptose / Proliferação de Células Limite: Animals Idioma: En Revista: J Morphol Ano de publicação: 2016 Tipo de documento: Article País de afiliação: Argentina País de publicação: Estados Unidos
Texto completo
Adicionar na Minha BVS
Imprimir
XML
PubMed Links
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Espermatogênese / Testículo / Bufonidae / Apoptose / Proliferação de Células Limite: Animals Idioma: En Revista: J Morphol Ano de publicação: 2016 Tipo de documento: Article País de afiliação: Argentina País de publicação: Estados Unidos