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Germ cell proliferation and apoptosis during testicular regression in a seasonal breeding fish kept in captivity.

Abstract：

:Cell proliferation and apoptosis regulate germ cells stock and sperm production, eliminate anomalous gametes, and are essential parameters to consider in fish farming. Herein, spermatogenic activity as well as germ cell proliferation and apoptosis were assessed in Leporinus taeniatus, a seasonal breeding species from the São Francisco River basin, Brazil. Testes of 24 adult fishes from a farming station were sampled between December and July and processed for light and transmission electron microscopy and immunohistochemistry for PCNA and TUNEL assay. The gonadosomatic index and seminiferous tubule diameters presented higher values during the breeding season (December/January and February/March), and then significantly reduced during the regression and resting stages (April/May and June/July). Phagocytosis of spermatozoa by Sertoli cells was evident during gonadal regression, but a significant number (up to 30%) remained at the tubular lumen during the resting stage. A higher PCNA/TUNEL ratio occurred in the breeding period, leading to an elevated proportion (%) of spermatogonia (GA and GB) in resting. Moreover, a higher TUNEL/PCNA ratio indicates the contribution of apoptosis to the reduction of germ cells during testicular regression. Together, these results indicate a shift in the balance between cell proliferation and apoptosis that contributes to the regulation of the spermatogenic cycle and germ cells pool of L. taeniatus kept in captivity.

journal_name

Tissue Cell

journal_title

Tissue & cell

authors

Ribeiro YM,Matos SA,Domingos FFT,Santos HBD,Cruz Vieira AB,Bazzoli N,Rizzo E

doi

10.1016/j.tice.2017.09.003

subject

Has Abstract

pub_date

2017-12-01 00:00:00

pages

664-671

issue

6

eissn

0040-8166

issn

1532-3072

pii

S0040-8166(17)30204-5

journal_volume

49

pub_type

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