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* Centenary Institute of Cancer Medicine and Cell Biology, New South Wales, Australia;
Department of Experimental Medicine, University of Sydney, New South Wales, Australia;
National Human Genome Research Institute, National Institutes of Health, Bethesda, MD 20892;
Division of Pediatric Oncology, Children’s Hospital of Philadelphia, Philadelphia, PA 19104; and
¶ Oncology Unit, Children’s Hospital Westmead, New South Wales, Australia
X-linked lymphoproliferative disease (XLP) is a severe immunodeficiency associated with a marked reduction in circulating memory B cells. Our investigation of the B cell compartment of XLP patients revealed an increase in the frequency of a population of B cells distinct from those previously defined. This population displayed increased expression of CD10, CD24, and CD38, indicating that it could consist of circulating immature/transitional B cells. Supporting this possibility, CD10+CD24highCD38high B cells displayed other immature characteristics, including unmutated Ig V genes and elevated levels of surface IgM; they also lacked expression of Bcl-2 and a panel of activation molecules. The capacity of CD24highCD38high B cells to proliferate, secrete Ig, and migrate in vitro was greatly reduced compared with mature B cell populations. Moreover, CD24highCD38high B cells were increased in the peripheral blood of neonates, patients with common variable immunodeficiency, and patients recovering from hemopoietic stem cell transplant. Thus, an expansion of functionally immature B cells may contribute to the humoral immunodeficient state that is characteristic of neonates, as well as patients with XLP or common variable immunodeficiency, and those recovering from a stem cell transplant. Further investigation of transitional B cells will improve our understanding of human B cell development and how alterations to this process may precipitate immunodeficiency or autoimmunity.
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