Two periods of total testicular regression are peculiar events of the annual reproductive cycle of the black Myotis bat, Myotis nigricans (Chiroptera: Vespertilionidae)

Autor(es)

Beguelini, Mateus R. ^[1] ; Goes, Rejane M. ^[1] ; Taboga, Sebastiao R. ^[1] ; Morielle-Versute, Eliana ^[2]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista, UNESP, Dept Biol, BR-15054000 Sao Paulo - Brazil

^[2] Univ Estadual Paulista, UNESP, Dept Bot & Zool, BR-15054000 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: REPRODUCTION FERTILITY AND DEVELOPMENT; v. 26, n. 6, p. 834-846, 2014.
• Citações Web of Science: 17

Resumo

Myotis nigricans presents few and controversial reproductive data, which indicate geographical variation in reproduction. Thus, this study aimed to evaluate the seasonal modifications in testicular and epididymal morphologies in a tropical environment, submitting these organs to morphometric and immunohistochemical analysis. The observations revealed that this species presents two peaks of spermatogenic activity followed by two periods of total testicular regression (a quiescent pre-pubertal-like morphology, where only Sertoli cells and spermatogonia could be observed), in the same annual reproductive cycle, which seem to be only indirectly influenced by abiotic factors. This testicular behaviour seems to be synchronised with the caput and corpus epididymidis, but not with the cauda epididymidis, which presents aspects of sperm storage in May-June. The control of this variation seems to be directly linked to the expression of the androgen receptor, since, throughout the year, it is high in periods of testicular recrudescence and low in periods of deactivation. It is not thought to be directly linked to apoptosis, which is more pronounced in periods of recrudescence than in periods of regression. (AU)

• Processo FAPESP: 09/03470-2 - Morfo-fisiologia da próstata de morcegos: estudo comparativo nas famílias Phyllostomidae, Molossidae e Vespertilionidae
• Beneficiário: Sebastião Roberto Taboga
• Linha de fomento: Auxílio à Pesquisa - Regular
• Processo FAPESP: 09/16181-9 - Análise ultra-estrutural e imunocitoquímica da espermatogênese e nucleologênese de morcegos
• Beneficiário: Eliana Morielle Versute
• Linha de fomento: Auxílio à Pesquisa - Regular