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Identification of a Germ-Line Pro-B Cell Subset That Distinguishes the Fetal/Neonatal from the Adult B Cell Development Pathway
Li-Sheng Lu, James Tung, Nicole Baumgarth, Ometa Herman, Michael Gleimer, Leonard A. Herzenberg and Leonore A. Herzenberg
Proceedings of the National Academy of Sciences of the United States of America
Vol. 99, No. 5 (Mar. 5, 2002), pp. 3007-3012
Published by: National Academy of Sciences
Stable URL: http://www.jstor.org/stable/3058064
Page Count: 6
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Studies presented here show that the expression of CD4, MHC class II (Ia,) and B220 cleanly resolves a major and a minor subset within the earliest pro-B cell population (germ-line pro-B) in adult bone marrow (BM). The major subset expresses intermediate B220 and low CD4 levels. The minor subset, which constitutes roughly 20% of the adult germ-line pro-B, expresses very low B220 levels and does not express CD4. Ia is clearly detectable at low levels on the major germ-line pro-B subset, both in wild-type adult mice and in gene-targeted mice (RAG-/- and µMT), in which B cell development terminates before the pre-B cell stage. A small proportion of cells in the more mature pro-B cell subsets (Hardy Fractions B and C) also express Ia at this level. In contrast, Ia levels on the minor subset are barely above (or equal to) background. Surprisingly, the major germ-line pro-B cell subset found in adults is missing in fetal and neonatal animals. All of the germ-line pro-B in these immature animals express a phenotype (very low B220, no CD4, or Ia) similar to that of the minor pro-B cell subset in adult BM. Because B cell development in fetal/neonatal animals principally results in B-1 cells, these findings demonstrate that the B-1 development pathway does not include the major germ-line pro-B subset found in adult BM and hence identify a very early difference between the B-1 and -2 development pathways.
Proceedings of the National Academy of Sciences of the United States of America © 2002 National Academy of Sciences