Morphological changes of Sertoli cells during the male reproductive cycle of the teleost Piaractus mesopotamicus (Holmberg, 1887)

Abstract

An investigation of the histological and ultrastructural changes of Sertoli cells during the male reproductive cycle in Piaractus mesopotamicus was made. The results showed that the Sertoli cell development is closely related with germ cell maturation. Therefore, these cells may have some role in germ cell maturation during the reproductive cycle of this species, whether in forming a tissue framework for the developing spermatogenic cysts, aiding in testes reorganization for a new reproductive cycle, in addition to other possible functions discussed in the text.Key words: spermatogenesis, testes, cyst cells, reproduction. RESUMO Mudanças morfológicas nas células de Sertoli durante o ciclo reprodutivo de machos do teleósteo Piaractus mesopotamicus (Holmberg, 1887)Realizou-se uma investigação das mudanças histológicas e ultra-estruturais das células de Sertoli durante o ciclo reprodutivo de machos de Piaractus mesopotamicus. Os resultados mostraram que o desenvolvimento das células de Sertoli está estritamente relacionado à maturação das células gaméticas. Portanto, as células de Sertoli têm algum papel na maturação das células germinativas durante o ciclo reprodutivo dessa espécie, talvez formando um tecido de sustentação para os cistos espermatogênicos em desenvolvimento, ajudando a reorganização testicular para um novo ciclo reprodutivo, além de outras possíveis funções discutidas no texto.Palavras-chave: spermatogênese, testículos, células do cisto, reprodução.

Reproductive biology of Oligosarcus argenteus (Gunther, 1864) adult males and description of the gonadal maturation stages

“…The utilization of spermatogenic cell morphometry as a reproductive stage indicator allowed to determine the three stages of the O. argenteus reproductive cycle. These results differed from other authors who found four or five stages (Modesto and Canário, 2002;Cruz-Landim et al, 2005). Results didn't show a gonadal rest period and consequently a gonadal recrudescence period, as found in other teleost species (Chaves-Pozo et al, 2005).…”

“…The annual cyclic activity of teleosts is arranged in a variable number of stages, considering different morphological and physiological criteria. Many studies have been made with the testicular cycle of teleost fishes (Ferrari, 1981;Andrade and Godinho, 1983;Silva, 1987;Azevedo et al, 1988;Patzner et al, 1991;Fraile et al, 1992;Modesto and Canário, 2002;Chaves-Pozo et al, 2005;Cruz-Landim et al, 2005), but there are still some questions about the reproductive cycle of many other species. The bocarra (Oligosarcus argenteus) is the species currently found in many hydrographic Brazilian bays, in lotic and lentic environments, where they are able to reproduce (Souza and Andrade, 1984).…”

Reproductive biology of the endangered percid <i>Zingel asper</i> in captivity: a histological description of the male reproductive cycle

“…During spermiation, the cytoplasmic extensions of Sertoli cells became increasingly attenuated and appeared to break. After spermiation, the residual spermatozoa were reabsorbed by the Sertoli cells [25,64,77,78].…”

“…It is divided into four stages, the initiation of spermatogenesis, active spermatogenesis, spermiation and resorption, as described in the literature [64]. The initiation of spermatogenesis, identified by the formation of spermatogonia B cysts, begins in September.…”

Characterizing Transcriptional Networks in Male Rainbow Darter (Etheostoma caeruleum) that Regulate Testis Development over a Complete Reproductive Cycle

“…Those processes are then suppressed as the testis enters recrudescence and begins a new maturation cycle. For example, phagocytosis increased 1.73 fold change (p = 0.001) from spawning to post-spawning; spermatozoa phagocytosis is a process that plays a significant role in testis development, mainly during the regression stage [28]. …”