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Microanalysis of Fish Ovarian Follicular Atresia: A Possible Synergic Action of Somatic and Immune Cells

Part of: Micrographia Collection

Published online by Cambridge University Press:  12 May 2020

Doaa M. Mokhtar Open the ORCID record for Doaa M. Mokhtar [Opens in a new window]  and
Marwa M. Hussein Open the ORCID record for Marwa M. Hussein [Opens in a new window]
Doaa M. Mokhtar*
Affiliation:
Department of Anatomy and Histology, Faculty of Veterinary Medicine, Assiut University, Assiut71526, Egypt
Marwa M. Hussein
Affiliation:
Department of Anatomy and Histology, Faculty of Veterinary Medicine, Assiut University, Assiut71526, Egypt
*
*Author for correspondence: Doaa M. Mokhtar, E-mail: doaamokhtar33@yahoo.com
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Abstract

The present study describes in detail the morphological characteristics of the process of ovarian follicular atresia in Redbelly tilapia (Coptodon zillii) during the nonbreeding season using light and electron microscopy and immunohistochemistry. The follicular regression process was initiated with shrinkage and disintegration of the nuclear membrane of oocytes resulting in dispersing of chromatin within the ooplasm, followed by marked hyperplasia and hypertrophy of follicular and granulosa cells, which exhibited a strong phagocytic activity to engulf the liquefied yolk particles. Rodlet cells and granulocytes were recorded on the follicular wall and invaded the regressed follicles. Rodlet cells expressed a strong immunoreactivity to matrix metalloperoxidase (MMP-9) and α-smooth muscle actin, while neutrophils expressed a strong reactivity to Myeloperoxidase-3 (MPO). In the advanced stage of follicular atresia, the yolk was almost phagocytized and resorbed and the regressed follicle lost its integrity and appeared to be formed of a cellular mass of phagocytic cells. Transmission electron microscopy revealed the presence of neutrophils, eosinophils, and dendritic cells within the atretic follicle in between these phagocytic cells. Moreover, numerous lysosomes, granules, and phagosomes were observed within the cytoplasm of both phagocytic cells and granulocytes. Telocytes were also demonstrated within the highly thickened richly vascularized theca layer during the late stages of follicular atresia. Immunohistochemical staining for caspase-3 established the participation of apoptosis in the advanced stages of follicular regression. Immune cells, rodlet cells, and telocytes in combination with follicular cells play an essential role in follicular atresia. In conclusion, the present study provides a new evidence on the role of both somatic and immune cells in the phenomenon of ovarian follicular atresia in Redbelly tilapia (Coptodon zillii) during the nonbreeding season.

Keywords

dendritic cellsfollicular atresiamacrophageneutrophilsrodlet cellstelocytes
Type
Micrographia
Information
Microscopy and Microanalysis , Volume 26 , Issue 3 , June 2020 , pp. 599 - 608
Copyright
Copyright © Microscopy Society of America 2020

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