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lüll Cutting edge commentary: origins of B-1 cells Wortis HH; Berland RJ Immunol 2001[Feb]; 166 (4): 2163-6The origin of B-1a cells, a minority population of B cells that express CD5, are abundant in coelomic cavities, and often produce autoantibodies, has been the subject of study for many years. Accumulating evidence demonstrates that the hypothesis that only B cells arising in fetal or neonatal tissues have the potential to become B-1a cells cannot be true. Rather, B cell receptor-mediated signaling initiated by ligation of autoantigen has now been shown to be required for induction of the B-1a phenotype. Furthermore, cells with a functional B-1a phenotype can be induced from adult precursors by appropriate Ag. At the same time, microenvironment-specific events may determine the likelihood that a given B cell, either adult or fetal derived, enters this pathway. CD5 expression and possibly localization to the peritoneum appear to provide some protection to autoreactive cells otherwise slated for elimination.|Animals[MESH]|B-Lymphocyte Subsets/*cytology/*immunology/metabolism[MESH]|Cell Differentiation/genetics/*immunology[MESH]|Cell Lineage/genetics/immunology[MESH]|Immunophenotyping[MESH] |