Curr Opin Immunol. 2006 Oct;18(5):547-55. Epub 2006 Aug 1.

B-1 B cells: development, selection, natural autoantibody and leukemia.

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Division of Basic Science, Fox Chase Cancer Center, Philadelphia, PA 19111, USA. rr_hardy@fccc.edu

Abstract

B-1 (CD5+) B cells constitute a phenotypic and functionally distinct population of B cells in mouse that show enriched expression of autoreactive B-cell antigen receptors and that produce several types of natural autoantibodies. Recently, there has been much progress in this field of research. Evidence has appeared for the existence of distinctive B-cell precursors that preferentially generate B-1 B cells, and the crucial requirement for strong B-cell antigen receptor signaling in the maturation of B-1 B cells has been established. Other work focuses on a phenotypically similar population that lacks CD5, termed 'B-1b', which shows similarities and differences from most CD5+ B cells in both development and function. The relationship of normal B-1 cells with B-cell lymphomas and leukemias continues to be a subject of interest and debate.

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