Detection of Circulating B Cells Producing Anti-GPIb Autoantibodies in Patients with Immune Thrombocytopenia

Overview

Journal PLoS One

Specialties General Medicine
Science

Date 2014 Jan 28

PMID 24466297

Citations 10

Authors

Masataka Kuwana

Yuka Okazaki

Yasuo Ikeda

Affiliations

Soon will be listed here.

Abstract

Background: We previously reported that an enzyme-linked immunospot (ELISPOT) assay for detecting anti-GPIIb/IIIa antibody-secreting B cells is a sensitive method for identifying patients with immune thrombocytopenia (ITP). Here we assessed the clinical significance of measuring circulating B cells producing antibodies to GPIb, another major platelet autoantigen.

Methods: Anti-GPIb and anti-GPIIb/IIIa antibody-producing B cells were simultaneously measured using ELISPOT assays in 32 healthy controls and 226 consecutive thrombocytopenic patients, including 114 with primary ITP, 25 with systemic lupus erythematosus (SLE), 30 with liver cirrhosis, 39 with post-hematopoietic stem cell transplantation (post-HSCT), and 18 non-ITP controls (aplastic anemia and myelodysplastic syndrome).

Results: There were significantly more circulating anti-GPIb and anti-GPIIb/IIIa antibody-producing B cells in primary ITP, SLE, liver cirrhosis, and post-HSCT patients than in healthy controls (P<0.05 for all comparisons). For diagnosing primary ITP, the anti-GPIb ELISPOT assay had 43% sensitivity and 89% specificity, whereas the anti-GPIIb/IIIa ELISPOT assay had 86% sensitivity and 83% specificity. When two tests were combined, the sensitivity was slightly improved to 90% without a reduction in specificity. In primary ITP patients, the anti-GPIb antibody response was associated with a low platelet count, lack of Helicobacter pylori infection, positive anti-nuclear antibody, and poor therapeutic response to intravenous immunoglobulin.

Conclusion: The ELISPOT assay for detecting anti-GPIb antibody-secreting B cells is useful for identifying patients with ITP, but its utility for diagnosing ITP is inferior to the anti-GPIIb/IIIa ELISPOT assay. Nevertheless, detection of the anti-GPIb antibody response is useful for subtyping patients with primary ITP.

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