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Precise quantitation of PAIgG: a new radiometric microtechnique
K A Schwartz1, J A Gauger, J M Davis
1Department of Medicine, Michigan State University, East Lansing 48824.
American Journal of Hematology
|March 1, 1990
Summary
A new radiometric assay accurately quantifies platelet-bound IgG (PAIgG) using minimal samples. This sensitive method aids in diagnosing immune thrombocytopenia and detecting antiplatelet antibodies.
Area of Science:
- Immunology
- Hematology
- Assay Development
Background:
- Platelet-bound IgG (PAIgG) is crucial in diagnosing immune thrombocytopenias.
- Accurate quantification of PAIgG is challenging, especially with limited patient samples.
Purpose of the Study:
- To develop a sensitive and quantitative radiometric assay for platelet-bound IgG.
- To enable diagnosis of immune thrombocytopenia and detection of antiplatelet antibodies.
Main Methods:
- Utilized 96-well plates with filter membranes.
- Employed a 125I-labeled monoclonal anti-human IgG secondary antibody.
- Quantitated antiplatelet IgG using purified 125I-labeled anti-PIA1 antibody.
Main Results:
- Assay requires minimal platelets (5 x 10^6) and plasma (10 µL).
- Detects ~200 molecules IgG/platelet with a linear range of 0-7,000 molecules/platelet.
- Identified increased PAIgG in ITP, malignancy, and drug-induced thrombocytopenia patients.
Conclusions:
- The developed radiometric assay is sensitive, quantitative, and reproducible.
- It enables precise PAIgG measurement from small sample volumes.
- The assay is valuable for diagnosing immune thrombocytopenias and detecting antiplatelet antibodies.
