Ultrastructure of ovarian follicular epithelium of the amazonian fish Pseudotylosurus microps (Gunther) (Teleostei, Belonidae): I. the follicular cells cycle of development

Carminda da Cruz-Landim Maria Alice da Cruz-Hofling About the authors

Abstract

The present paper deals with the changes on ultrastructural features of the follicular cells along the growth of the oocyte of Pseudotylosurus microps (Gunther, 1868). The epithelium pass from single squamous to pseudostratified and finally cylindric. Remarkable are the changes in the nuclear shapes, the increasing amount of rough endoplasmic reticulum and the formation of large lipid deposits in the follicular cells by the end of vitellogenic phase. Very peculiar intercellular deposits forms between the perinucleolar and vitellogenic phase of oocyte maturation. Although largely referred to in the specialized literature, our attempts to correlate the follicular cells changes with the formation of the oocyte envelopes or even with an endocrine function are not supported by conclusive evidences in the present paper.

Pseudotylosurus microps; follicular epithelium; ultrastructure; teleost


Ultrastructure of ovarian follicular epithelium of the amazonian fish Pseudotylosurus microps (Gunther) (Teleostei, Belonidae). I. The follicular cells cycle of development

Carminda da Cruz-LandimI; Maria Alice da Cruz-HoflingII

IDepartamento de Biologia, Instituto de Biociências, Universidade Estadual Paulista. 13506-900 Rio Claro, São Paulo, Brasil

IIDepartamento de Histologia e Embriologia, Instituto de Biologia, Universidade Estadual de Campinas. 13083-970 Campinas, São Paulo, Brasil

ABSTRACT

The present paper deals with the changes on ultrastructural features of the follicular cells along the growth of the oocyte of Pseudotylosurus microps (Gunther, 1868). The epithelium pass from single squamous to pseudostratified and finally cylindric. Remarkable are the changes in the nuclear shapes, the increasing amount of rough endoplasmic reticulum and the formation of large lipid deposits in the follicular cells by the end of vitellogenic phase. Very peculiar intercellular deposits forms between the perinucleolar and vitellogenic phase of oocyte maturation. Although largely referred to in the specialized literature, our attempts to correlate the follicular cells changes with the formation of the oocyte envelopes or even with an endocrine function are not supported by conclusive evidences in the present paper.

Key words:Pseudotylosurus microps, follicular epithelium, ultrastructure, teleost

Full text available only in PDF format.

ACKNOWLEDGEMENTS. Identification of the specimens by Dr. Naércio Menezes and Dr. Heraldo Britski is gratefully acknowledged. This work was supported by grants from FAPESP, FINEP, CNPq and FAEP-UNICAMP.

Recebido em 28.X.1999; aceito em 29.III.2001

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Publication Dates

  • Publication in this collection
    30 Apr 2009
  • Date of issue
    Mar 2001

History

  • Accepted
    29 Mar 2001
  • Received
    28 Oct 1999
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