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Phenotypic diversity of cloned lines of Leishmania major promastigotes

C L Greenblatt, E Handman, G F Mitchell

    Zeitschrift Fur Parasitenkunde (Berlin, Germany)
    |January 1, 1985
    PubMed

    Insights

    Virulent and avirulent Leishmania major strains showed similar growth rates but varied in morphology and DNA content over time. No direct correlation was found between antigen expression and virulence, highlighting the complexity of Leishmania major virulence markers.

    Area of Science:

    • Parasitology
    • Molecular Biology
    • Immunology

    Background:

    • Leishmania major is a protozoan parasite responsible for cutaneous leishmaniasis.
    • Virulence in Leishmania major is complex and not fully understood.
    • Identifying reliable markers for virulence is crucial for disease control.

    Purpose of the Study:

    • To investigate morphological, biochemical, and antigenic differences between virulent and avirulent Leishmania major strains.
    • To assess the stability of virulence in cloned Leishmania major lines.
    • To explore potential markers for Leishmania major virulence.

    Main Methods:

    • In vitro culture of virulent and avirulent Leishmania major promastigotes.
    • Morphological analysis, cell size measurement, and growth rate determination.
    • DNA content assessment using Hoechst Dye 33342.
    • Antigen expression analysis using monoclonal antibody WIC-79.3 and flow cytometry.
    • Virulence assessment in BALB/c mice.

    Main Results:

    • All Leishmania major lines exhibited comparable growth rates.
    • Apparent DNA content decreased over time in culture for both virulent and avirulent strains.
    • Differences in morphological variants and mean body length were observed.
    • Expression and release of the WIC-79.3 target antigen varied among strains but did not correlate with virulence.
    • Virulence of cloned lines remained stable in BALB/c mice.

    Conclusions:

    • Morphological and antigenic characteristics of Leishmania major promastigotes vary independently of virulence.
    • The study highlights the complexity of Leishmania major virulence and the need for further research into differentiation stages and reliable markers.
    • No simple correlation was found between the WIC-79.3 antigen and Leishmania major virulence.

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