Busca avançada
Ano de início
Entree


Testis structure, spermatogonial niche and Sertoli cell efficiency in Neotropical fish

Texto completo
Autor(es):
de Siqueira-Silva, Diogenes Henrique ; Rodrigues, Maira da Silva ; Nobrega, Rafael Henrique
Número total de Autores: 3
Tipo de documento: Artigo Científico
Fonte: General and Comparative Endocrinology; v. 273, p. 9-pg., 2019-03-01.
Resumo

Neotropical icthyofauna represents one of the most diverse and extreme ecosystems in the world. Likewise, reproduction showed enormous diversity with different reproductive systems, modes and behavior. On the other hand, information on Neotropical fish species, in particular on male reproductive physiology is restricted to few species. This mini-review aimed to compile the existing information on spermatogenesis of Neotropical teleosts focusing on testis structure, spermatogonial niche and Sertoli cell efficiency. The first topic covers the histological analysis of the testicular structure, showing a conserved testicular pattern in relation to the phylogenetic position: basal species present anastomosing tubular testis (e.g. Astyanax altiparanae, Conorhynchos conirostris, Pimelodus maculatus, Lophiositurus alexandri, Rhinelepis aspera, among others), while derived teleosts showed lobular testis (e.g. Cichlasoma dimerus, Cichla kelberi, Odontesthes bonariensis, Synbranchus marmoratus and others). Next to testicular structure, existing data showed that type A undifferentiated spermatogonia (A(und)) is differentially distributed among the Neotropical species. A(und) can be restricted at the blind-end of the germinal compartment (O. bonariensis), or spread along the germinal epithelium (A. altiparanae), or even distributed along the germinal epithelium but concentrated at the blind-end (C. kelberi and C. intermedia). Moreover, recent studies in A. altiparanae have demonstrated that within the germinal compartment, A(und) have a preferential distribution in areas neighboring the interstitial compartment - the spermatogonial niche. The proximity with the interstitium suggests that interstitial cells, such as Leydig cells, are important for A(und) maintenance in the testis. Finally, this mini-review highlighted Sertoli cell efficiency, showing that a single Sertoli cell can support a higher number of germ cells (80-140 spermatids) in Neotropical species evaluated at the moment (e.g. A. altiparanae, Hoplias malabaricus, Poecilia reticulata, Serrasaltnus spilopleura, C. intermedia). Overall, this review provided basic and functional information on spermatogenesis of Neotropical species. More studies in this field are necessary since Neotropical region is considered one of the hotspot regions to discovery new species providing, therefore, new opportunities to investigate spermatogenesis in fish. (AU)

Processo FAPESP: 14/07620-7 - Banco de espermatogônias tronco em peixes para conservação do genótipo de espécies ameaçadas e de interesse econômico
Beneficiário:Rafael Henrique Nóbrega
Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
Processo FAPESP: 17/15793-7 - Efeitos do hipotireoidismo na função testicular de Danio rerio e relação dos hormônios tireoidianos com o hormônio folículo estimulante (Fsh)
Beneficiário:Maira da Silva Rodrigues
Modalidade de apoio: Bolsas no Brasil - Mestrado