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Chronic infection with hepatitis C virus (HCV) is associated with disturbances of B lymphocyte activation and function: autoantibody production, mixed cryoglobulinemia, and B cell lymphomas. It has been proposed that these abnormalities reflect chronic antigenic stimulation or aberrant signaling through the B cell coreceptor, the latter mediated by binding of the HCV E2 glycoprotein to CD81. To test this hypothesis, we measured expression of activation and differentiation markers on peripheral blood B cells from patients with chronic HCV infection. Thirty-six HCV patients with and without mixed cryoglobulinemia were compared with 18 healthy control volunteers and 17 sustained virologic responders who had cleared HCV infection. Ten of the 36 HCV patient samples showed increased B cell frequencies; B cell frequency was higher in patients with more severe hepatic fibrosis. However, these samples lacked evidence of Ag-driven activation or proliferation. The expanded cells were low in the activation markers CD25, CD69, CD71, CD80, and CD86. Proliferation of circulating B cells was unchanged in HCV patients. These cells did not express the differentiation marker CD27, suggesting that they were not enriched in memory B cells. Furthermore, the expanded B cells expressed both IgD and IgM, suggesting that they were antigenically naive. Together, these results indicate that B cell expansion in the peripheral blood of HCV patients is not associated with Ag-mediated activation and differentiation. Instead, factors other than antigenic stimulation may promote the accumulation of peripheral blood B cells with a naive phenotype in a subset of HCV patients.

Original publication

DOI

10.4049/jimmunol.170.6.3429

Type

Journal article

Journal

Journal of immunology (Baltimore, Md. : 1950)

Publication Date

03/2003

Volume

170

Pages

3429 - 3439

Addresses

Center for the Study of Hepatitis C, Laboratory of Virology and Infectious Disease, The Rockefeller University, New York, NY 10021, USA.

Keywords

B-Lymphocyte Subsets, Humans, Hepatitis C, Membrane Proteins, Antigens, CD27, Viral Envelope Proteins, Antigens, CD, Antigens, CD5, Ligands, Lymphocyte Count, Flow Cytometry, Severity of Illness Index, Immunophenotyping, Lymphocyte Activation, Cell Division, Interphase, Adolescent, Adult, Aged, Middle Aged, Female, Male, Antigens, CD81