期刊
MICRON
卷 61, 期 -, 页码 20-27出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.micron.2014.02.004
关键词
Lambari A. altiparanae; Testes; Sertoli cells; Stereology; Secretion; Scanning and transmission electron; microscopy
类别
资金
- Fundacao Araucaria
- CNPq
The Astyanax altiparanae (lambari) is a South American freshwater fish belonging to the family Characidae. Although some authors have described reproductive aspects of this species, this is the first study about the morphology of the testes throughout the annual reproductive cycle of A. altiparanae. Fish spermatogenesis differs from that in mammals as it occurs in cysts whose borders are defined by cytoplasmic processes of Sertoli cells, thus creating a favorable environment for spermatogenesis. The functions commonly attributed to fish Sertoli cells were investigated using stereological, light and electron microscopy in A. altiparanae. Results showed that when the Sertoli cells of A. altiparanae are in contact with germ cells, they plan a support function that culminates in the production of spermatozoa. After releasing spermatozoa, modified Sertoli cells form the duct epithelium, transform into secretory cells and release a secretion into the duct lumen where spermatids and sperm are located. Thus, the present study revealed important aspects of the testes of A. altiparanae, and propose a sequence of functions played by the Sertoli cells in this species. (C) 2014 Elsevier Ltd. All rights reserved.
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