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• W2155647946 abstract "Abstract Hypergammaglobulinemia and defective humoral immunity are hallmarks of HIV-1 infection. Naive B cells have been recently suggested as the major source of hypergammaglobulinemia in chronic viral infections. We recently reported that HIV-1–infected patients carry low levels of memory B cells. Here we studied whether defects in the naive and memory B cells in HIV-1–infected patients translated into hypergammaglobulinemia and defective humoral immunity against specific antigens. Naive B cells from HIV-1–infected patients exhibited abnormal expression of the activation/differentiation markers CD70 and leukocyte-associated Ig-like receptor (LAIR-1). Activated naive B cells from patients showed a significant increase in the intracellular immunoglobulin G (IgG) content ex vivo and this activated phenotype correlated to hypergammaglobulinemia and to the ability of naive B cells from patients to secrete IgG in vitro. We analyzed the levels of antibodies to tetanus toxoid, measles, and HIV-1 in relation to memory B cells and observed a significant reduction of antigen-specific antibodies in patients with low-memory B lymphocytes. Nevertheless, hypergammaglobulinemia and levels of polyspecific self-reactive antibodies were comparable in patients with normal and low memory B cells. We conclude that reduction of memory B lymphocytes in HIV-1 infection correlates with defective humoral immunity and that hyperactivated naive B cells may represent the source of abnormal IgG production in HIV-1 infection. Our results may be relevant to the design of HIV-1 therapeutical vaccines and to the clinical management of HIV-1–infected patients." @default.
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• W2155647946 date "2004-03-15" @default.
• W2155647946 modified "2023-10-12" @default.
• W2155647946 title "Mechanisms of hypergammaglobulinemia and impaired antigen-specific humoral immunity in HIV-1 infection" @default.
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• W2155647946 doi "https://doi.org/10.1182/blood-2003-07-2375" @default.
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