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Related Experiment Videos

Immune complexes in Indian kala-azar.

S Sehgal, B K Aikat, A G Pathania

    Bulletin of the World Health Organization
    |January 1, 1982
    PubMed
    Summary
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    Indian kala-azar patients exhibit circulating immune complexes and low complement levels, potentially impacting immune responses. Crithidia luciliae can substitute for Leishmania donovani in antibody testing.

    Area of Science:

    • Immunology
    • Infectious Diseases
    • Parasitology

    Background:

    • Kala-azar, or visceral leishmaniasis, is a severe parasitic disease.
    • Patients often show impaired cell-mediated immunity.
    • The role of immune complexes in pathogenesis is not fully understood.

    Purpose of the Study:

    • To investigate circulating immune complexes and complement levels in Indian kala-azar patients.
    • To evaluate the utility of Crithidia luciliae as an antigen for antibody detection.
    • To explore the relationship between immune complexes and immune response deficits.

    Main Methods:

    • Platelet aggregation, complement deviation, and polyethylene glycol precipitation tests for immune complexes.
    • Indirect immunofluorescence assay using Leishmania donovani and Crithidia luciliae for antibodies.

    Related Experiment Videos

  • Mancini technique for serum complement C3 levels.

    • Main Results:

    • A high prevalence of circulating immune complexes was detected in patients.
    • Significantly lowered serum complement (C3) levels were observed.
    • Crithidia luciliae demonstrated shared antigens with Leishmania donovani, proving effective for antibody detection.

    Conclusions:

    • Circulating immune complexes and hypocomplementemia are characteristic of Indian kala-azar.
    • These findings suggest a link between immune complexes and depressed cell-mediated immunity.
    • Crithidia luciliae is a viable alternative antigen for diagnosing kala-azar via immunofluorescence assays.