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Related Experiment Videos

Elusive trypanosomes.

P Dukes1, J J McNamara, D G Godfrey

  • 1Tsetse Research Laboratory, Department of Veterinary Medicine, University of Bristol, U.K.

Annals of Tropical Medicine and Parasitology
|February 1, 1991
PubMed
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In vitro culture techniques enable the isolation and characterization of African trypanosomes (parasites causing sleeping sickness) that do not infect rodents. This advances the study of diverse parasite species previously difficult to analyze.

Area of Science:

  • Parasitology
  • Molecular Biology
  • Biochemistry

Background:

  • Anion-exchange separation historically enabled African trypanosome characterization but relied on rodent infectivity.
  • Rodent models limit the study of trypanosome species unable to infect or adequately multiply in these hosts.
  • Field sample collection was restricted by the poor rodent infectivity of certain trypanosome strains.

Purpose of the Study:

  • To overcome limitations in rodent-based trypanosome isolation and characterization.
  • To develop methods for culturing and biochemically analyzing trypanosomes with poor or nil rodent infectivity.
  • To investigate the diversity of African trypanosomes, including those not easily cultured in vivo.

Main Methods:

  • Utilized in vitro culture techniques to obtain large quantities of trypanosomes.

Related Experiment Videos

  • Isolated procyclic forms directly from wild tsetse flies.
  • Transformed low numbers of bloodstream forms from field samples to the procyclic phase using experimental tsetse flies.
  • Employed biochemical characterization methods on cultured parasite material.

    • Main Results:

    • Successfully cultured trypanosomes with poor or nil infectivity to rodents in sufficient quantities for analysis.
    • Identified specimens of a new Nannomonas species, Trypanosoma simiae, T. grayi, and an antigenically distinct T. brucei gambiense.
    • Demonstrated the effectiveness of in vitro culture for isolating previously uncharacterizable trypanosome species.
    • Provided evidence that many trypanosome species may evade isolation due to poor rodent infectivity.

    Conclusions:

    • In vitro culture methods, particularly those involving tsetse fly transmission and procyclic transformation, are crucial for studying African trypanosomes with limited rodent infectivity.
    • These advanced culture techniques significantly expand the scope of biochemical characterization and parasite discovery.
    • The findings suggest a broader diversity of trypanosome species in circulation than previously recognized, highlighting the limitations of rodent models in parasitological research.