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Partial characterization of a Trypanosoma cruzi-released decomplementing factor.

D S Cunningham, T E Brewer, R E Kuhn

    The Journal of Parasitology
    |August 1, 1981
    PubMed
    Summary

    Trypanosoma cruzi secretes a serum active component (SCAF) that rapidly depletes complement activity in normal sera. This factor

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    Area of Science:

    • Immunology
    • Parasitology
    • Biochemistry

    Background:

    • Trypanosoma cruzi is a protozoan parasite that causes Chagas disease.
    • The host immune system, including complement (C'), plays a role in controlling T. cruzi infections.
    • Understanding parasite-host interactions is crucial for developing therapeutic strategies.

    Purpose of the Study:

    • To investigate the effect of a factor released by T. cruzi on serum complement activity.
    • To characterize the properties and kinetics of this serum active component (SCAF).

    Main Methods:

    • In vitro culture of Trypanosoma cruzi to produce SCAF.
    • Assays to measure serum complement activity (hemolytic C' activity).
    • In vivo administration of SCAF to mice to assess its effect on complement levels.
    • Molecular weight estimation of the active moiety.

    Main Results:

    • T. cruzi releases a factor (SCAF) that rapidly decomplements normal mouse, human, and guinea pig sera in vitro.
    • SCAF production is dependent on parasite density, viability, and culture duration.
    • In vivo, SCAF reduced hemolytic complement activity in normal mice by up to 50%.
    • SCAF had no effect on complement levels in mice infected with T. cruzi for over 10 days.
    • The active component of SCAF has a molecular weight of approximately 23,000 daltons and is nonproteinaceous.

    Conclusions:

    • Trypanosoma cruzi produces a potent complement-depleting factor (SCAF).
    • SCAF's activity is rapid and its production is linked to parasite growth conditions.
    • The parasite factor may play a role in immune evasion during early T. cruzi infection.
    • The nonproteinaceous nature and molecular weight provide targets for further biochemical characterization.

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