Cumulative experience with a simplified solid-phase radioimmunoassay for the detection of bound antiplatelet IgG, serum auto-, allo-, and drug-dependent antibodies

Journal Article · Fri Oct 01 04:00:00 EDT 1982 · Blood; (United States)

OSTI ID:6172850

Faig, D; Karpatkin, S

A simplified, sensitive, solid-phase radioimmunoassay employing /sup 125/I-staphylococcal protein A has been developed that is capable of detecting bound antiplatelet IgG as well as serum auto-, allo-, and drug-dependent antiplatelet antibodies. The simplified assay employs a ratio of test over control platelet counts per minute (cpm) for detection of positive results. All reagents are commercially available. The assay can be performed with as little as 10/sup 6/ washed platelets (10 ..mu..l of whole blood) that have been stored for as long as 8 wk at 4/sup 0/C in microtiter plates. The assay time, employing stored platelets, is 4 hr. Bound platelet IgG is positive in 93% of 46 thrombocytopenic patients with autoimmune disease and correlates inversely with their platelet count, r = -0.65, p < 0.001. The ability of this assay to detect serum antibody was studied with a rabbit anti-human platelet antibody capable of giving optimal immunoprecipitation with solubilized platelet membranes at a titer of 1:10. The present assay increases the sensitivity of antibody detection 256-fold to a titer of 1:2560. Human serum antiplatelet membrane antibody was positive in 2 of 2 patients with anti-PLA-1 antibody (titers of 1:256 and >1:64); 7 of 12 multiply transfused patients who were refractory to platelet transfusion (2 had titers of >1:256 and 1:32); 5 of 19 patients with autoimmune thrombocytopenic purpura (2 had titers of 1:64 and 1:32); and 10 of 14 patients with clinical histories of drug-dependent antiplatelet antibody (2 had titers of 1:1280 for quinidine and 1:384 for phenazopyridine).

• Research Organization: New York Univ. Medical Center, NY
• OSTI ID: 6172850
• Journal Information: Blood; (United States), Journal Name: Blood; (United States) Vol. 60:4; ISSN BLOOA
• Country of Publication: United States
• Language: English

Related Subjects

550601* -- Medicine-- Unsealed Radionuclides in Diagnostics
62 RADIOLOGY AND NUCLEAR MEDICINE
ANTIBODIES
BETA DECAY RADIOISOTOPES
BIOLOGICAL MATERIALS
BLOOD
BLOOD CELLS
BLOOD PLATELETS
BODY FLUIDS
DAYS LIVING RADIOISOTOPES
DIAGNOSIS
DISEASES
ELECTRON CAPTURE RADIOISOTOPES
IMMUNE REACTIONS
INTERMEDIATE MASS NUCLEI
IODINE 125
IODINE ISOTOPES
ISOTOPE APPLICATIONS
ISOTOPES
MATERIALS
NUCLEI
ODD-EVEN NUCLEI
PATIENTS
RADIOASSAY
RADIOIMMUNOASSAY
RADIOISOTOPES
SENSITIVITY
TRACER TECHNIQUES