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Endoplasmic reticulum and Golgi-like elements in Entamoeba

A Mazzuco1, M Benchimol, W De Souza

  • 1Instituto de Biofisica Carlos Chagas Filho, Universidade Federal do Rio de Janiero, Brazil.

Micron (Oxford, England : 1993)
|June 1, 1997
PubMed
Summary

This study identifies the endoplasmic reticulum and Golgi complex in Entamoeba using advanced microscopy and cytochemical methods. Findings suggest cytoplasmic vacuoles represent these key organelles in Entamoeba moshkovskii and Entamoeba histolytica.

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Area of Science:

  • Cell Biology
  • Microbiology
  • Parasitology

Background:

  • The cytoplasm of Entamoeba species contains numerous vesicles, but the endoplasmic reticulum and Golgi complex have been difficult to identify.
  • Previous electron microscopy studies have not clearly resolved these organelles.

Purpose of the Study:

  • To identify the endoplasmic reticulum and Golgi complex in Entamoeba moshkovskii and Entamoeba histolytica trophozoites.
  • To characterize the morphology and distribution of these organelles within the parasite cytoplasm.

Main Methods:

  • Utilized cytochemical techniques with transmission electron microscopy, including osmium tetroxide-zinc iodide staining.
  • Employed enzyme localization for glucose-6-phosphatase and thiaminopyrophosphatase.
  • Applied fluorescent dyes (DiOC6, C6-NBD ceramide) for labeling, followed by confocal laser scanning microscopy.

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Main Results:

  • Observations suggest that certain cytoplasmic vacuoles in Entamoeba correspond to components of the endoplasmic reticulum.
  • Evidence indicates that other vacuoles may represent the Golgi complex.
  • Combined cytochemical and fluorescence microscopy provided clearer visualization of these structures.

Conclusions:

  • This study provides strong evidence for the presence and localization of the endoplasmic reticulum and Golgi complex in Entamoeba.
  • Cytoplasmic vacuoles are likely integral parts of these organelle systems in Entamoeba moshkovskii and Entamoeba histolytica.
  • The applied methodologies offer new insights into the ultrastructure of Entamoeba.