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    Inhibition of antibody-dependent cellular cytotoxicity by artificial immune complexes and pathological sera.

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    Authors
    Howat, J
    Moore, Michael
    Hilton, A
    Kimber, I
    Issue Date
    1979-06
    
    Metadata
    Show full item record
    Abstract
    Detection of immune complexes by inhibition of antibody-dependent cellular cytotoxicity (ADCC) is based on the principle that soluble complexes can compete with target cell-bound antibody for receptors (FcR) on cytotoxic lymphocytes. The objective of this study was to define a cytotoxicity system for the determination of soluble immune complexes in the sera of patients with inflammatory bowel disease (IBD). For this purpose, the conditions under which soluble complexes of rat serum albumin (RSA) and rabbit anti-RSA inhibited human K-cell mediated lysis of sensitized Chang cells were examined, on the assumption that the behaviour in the system of circulating immune complexes putatively present in inflammatory bowel disease, is similar to that of artificial immune complexes. Inhibition of ADCC by a standard amount of artificial complex in different normal human sera was relatively uniform provided that the final concentration of the latter did not exceed 10% of the culture medium. In the absence of extraneous complexes, the effect of both normal and IBD sera on ADCC varied widely. Differential inhibition of ADCC by sera from patients with IBD and normal subjects was thus expressed as a function of ADCC in a standard batch of foetal bovine serum (FBS). Under these conditions differences between pathological (n = 51) and normal (n = 52) sera were highly significant (P less than 0.001), which could not be explained by the presence in the patients' sera of HL-A antibodies reactive with the effector cells, nor by a deficit in nutritional support of ADCC. The absence of a correlation between inhibition of ADCC and total serum IgG or IgM inferred that inhibition was attributable to immune complexes in the IBD sera. The limitations of this assay for assessment of the incidence of immune complexes in pathological sera are discussed.
    Citation
    Inhibition of antibody-dependent cellular cytotoxicity by artificial immune complexes and pathological sera. 1979, 37 (2):467-75 Immunology
    Journal
    Immunology
    URI
    http://hdl.handle.net/10541/135874
    PubMed ID
    468310
    Type
    Article
    Language
    en
    ISSN
    0019-2805
    Collections
    All Paterson Institute for Cancer Research

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