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Allogeneic hematopoietic stem cell transplantation recipients have defects of both switched and IgM memory B cells

D'Orsogna, L.J., Wright, M.P., Krueger, R.G., McKinnon, E.J., Buffery, S.I., Witt, C.S., Staples, N., Loh, R., Cannell, P.K., Christiansen, F.T. and French, M.A. (2009) Allogeneic hematopoietic stem cell transplantation recipients have defects of both switched and IgM memory B cells. Biology of Blood and Marrow Transplantation, 15 (7). pp. 795-803.

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Allogeneic hematopoietic stem cell transplant (HSCT) recipients were assessed to elucidate memory B cell defects underlying their increased susceptibility to infections, particularly by encapsulated bacteria. Circulating IgM memory B cells (CD19+, CD27+, IgM+) and switched memory B cells (CD19+, CD27+, IgM-) were enumerated in allogeneic HSCT recipients (n = 37) and healthy controls (n = 35). T lymphocyte subpopulations and serum levels of immunoglobulins, including IgG subclasses, and antibodies to pneumococcal polysaccharides were also assayed. Allogeneic HSCT recipients were deficient in both switched memory and IgM memory B cells compared to healthy controls (both P < .0001), irrespective of time post-HSCT. Switched memory B cell deficiency correlated with CD4+ T cell deficiency, and both correlated with serum levels of IgG1 (P < .0001), possibly reflecting impaired B cell isotype switching in germinal centres. "Steady-state" serum levels of antibodies to pneumococcal polysaccharides did not correlate with circulating memory B cells. Graft-versus-host disease (GVHD) was associated with lower IgM memory B cell counts and lower serum levels of IgG2, IgG4, IgA, and pneumococcal antibodies. The increased susceptibility of allogeneic HSCT patients to infection may reflect a combination of memory B cell defects, which are most common in patients with a history of GVHD.

Item Type: Journal Article
Murdoch Affiliation(s): Centre for Clinical Immunology and Biomedical Statistics
Publisher: Elsevier BV
Copyright: © 2009 American Society for Blood and Marrow Transplantation.
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