title: PMN chemotactic inhibition associated with a cryoglobulin.
abstract: A child with recurrent pyogenic infections, eczema, markedly elevated serum concentrations IgA, and totally absent PMN chemotactic acticity is described. The chemotactic defect was characterized as a humoral inhibitor present in serumand plasma, directed toward autologous as well as homologous PMN's. Immunochemical studies revealed the purified inhibitor to be a cryoglobulin composed of an IgM-IgA complex. Incubation of the cryoglobulin complex with PMN's resulted in a quantitative dose-response curve.
mesh_terms: D000918:Antibody Specificity; D000936:Antigen-Antibody Complex; D002634:Chemotaxis, Leukocyte; D002648:Child; D003450:Cryoglobulins / Q000276:immunology*; D005260:Female; D006801:Humans; D007070:Immunoglobulin A / Q000032:analysis; D007073:Immunoglobulin E / Q000032:analysis; D007074:Immunoglobulin G / Q000032:analysis; D007075:Immunoglobulin M / Q000032:analysis; D009504:Neutrophils / Q000276:immunology*
chemical_list: D000936:Antigen-Antibody Complex; D003450:Cryoglobulins; D007070:Immunoglobulin A; D007074:Immunoglobulin G; D007075:Immunoglobulin M; D007073:Immunoglobulin E