title: A simplified micro ELISA procedure for the measurement of platelet-associated IgG (PAIgG).
abstract: A simplified micro ELISA procedure to measure platelet-associated IgG is described. The platelet-bound IgG first is extracted into the fluid phase by solubilizing washed platelets in 0.1% triton X-100. The solubilized IgG in the extract and IgG standards are incubated in microtiter wells previously coated with antihuman IgG. The IgG in the standards and extract bind to the solid phase antihuman IgG. The bound IgG then is measured by the addition of peroxidase labeled antihuman IgG and appropriate substrate. With this method platelets from normal controls were found to have 1.7 +/- 0.6 fg IgG/platelet (mean +/- SD). Platelets from patients with ATP had values that were two to seven times the control values. The relative advantage of this technic is discussed.
mesh_terms: D001323:Autoantibodies / Q000032:analysis; D001792:Blood Platelets / Q000276:immunology*; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods*; D006801:Humans; D007124:Immunoenzyme Techniques; D007074:Immunoglobulin G / Q000032:analysis*; D010976:Platelet Count; D011696:Purpura, Thrombocytopenic / Q000276:immunology; D013921:Thrombocytopenia / Q000276:immunology
chemical_list: D001323:Autoantibodies; D007074:Immunoglobulin G