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Selective decrease in antibody-dependent cell-mediated cytotoxicity in systemic lupus erythematosus and progressive

S M Cooper, B Harding, G R Mirick

    Clinical and Experimental Immunology
    |November 1, 1978
    PubMed
    Summary
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    Patients with systemic lupus erythematosus (SLE) and progressive systemic sclerosis (PSS) show reduced antibody-dependent cell-mediated cytotoxicity (ADCMC) against Chang cells, suggesting a specific impairment in immune effector cells for certain targets in these autoimmune diseases.

    Area of Science:

    • Immunology
    • Autoimmune Diseases
    • Cellular Immunology

    Background:

    • Systemic lupus erythematosus (SLE) and progressive systemic sclerosis (PSS) are autoimmune diseases characterized by immune system dysregulation.
    • Antibody-dependent cell-mediated cytotoxicity (ADCMC) is a crucial immune mechanism involving effector cells that kill target cells coated with antibodies.

    Purpose of the Study:

    • To investigate the antibody-dependent cell-mediated cytotoxicity (ADCMC) function in patients with SLE and PSS.
    • To determine if ADCMC is uniformly affected or selectively impaired against specific target cells in these conditions.

    Main Methods:

    • Peripheral blood mononuclear cells (PBMCs) from SLE and PSS patients were assessed for ADCMC activity.
    • Two distinct target cells, chicken erythrocytes and Chang cells, were used to evaluate ADCMC against different cellular targets.

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    Main Results:

    • Patients with active SLE exhibited significantly reduced ADCMC against Chang cells, but not against chicken erythrocytes.
    • A subset of PSS patients with anti-DNP antibodies also showed a selective decrease in ADCMC against Chang cells.
    • These results indicate differential involvement of effector cells in ADCMC depending on the target cell.

    Conclusions:

    • The findings suggest that distinct effector cell populations mediate ADCMC against chicken erythrocytes and Chang cells.
    • A selective reduction or blockade of ADCMC effector cells targeting Chang cells may occur in some SLE and PSS patients.
    • This selective impairment could contribute to the pathogenesis of these autoimmune diseases.