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Related Experiment Videos

Fluorogenic detection of viable Toxoplasma gondii

E Borel1, M Mayençon, K Kaiser

  • 1Laboratoire de Parasitologie-Mycologie Médicale et Pathologie Exotique, Université Claude Bernard Lyon I. eborel@rockefeller.univ-lyon1.fr

Parasite (Paris, France)
|January 8, 1999
PubMed
Summary

Two new double staining assays, acridine orange–ethidium bromide (AO-EB) and bisbenzimide–propidium iodide (B-PI), effectively distinguish live and dead Toxoplasma gondii. These methods offer sensitive, rapid, and informative in vitro assessment of parasite viability and behavior.

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Area of Science:

  • Parasitology
  • Cell Biology
  • Microbiology

Background:

  • Assessing Toxoplasma gondii viability in vitro is crucial for understanding parasite growth and drug efficacy.
  • Existing methods like Giemsa staining and indirect immunofluorescence have limitations in speed and information content.

Purpose of the Study:

  • To develop and present two novel double staining assays for easy and accurate assessment of live and dead Toxoplasma gondii in vitro.
  • To compare the efficacy of these new assays against traditional methods.

Main Methods:

  • Utilized acridine orange–ethidium bromide (AO-EB) and bisbenzimide–propidium iodide (B-PI) double staining techniques.
  • AO and B stain viable organisms, while EB and PI stain dead organisms.
  • Evaluated the assays for sensitivity, ease of use, and time efficiency in culture.

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Main Results:

  • Both AO-EB and B-PI assays successfully visualized live and dead Toxoplasma gondii.
  • These double staining methods provided more information than Giemsa staining or indirect immunofluorescence.
  • The assays allowed for the study of internal parasite structure and host-parasite interactions.
  • Detection in culture was sensitive, easier, and less time-consuming compared to previous methods.

Conclusions:

  • The AO-EB and B-PI double staining assays are valuable tools for in vitro assessment of Toxoplasma gondii.
  • These methods enhance the study of parasite viability, growth, destruction, and strain behavior.
  • The assays offer a more informative and efficient alternative to existing detection techniques.