Journal
IMMUNITY
Volume 15, Issue 4, Pages 521-531Publisher
CELL PRESS
DOI: 10.1016/S1074-7613(01)00216-3
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B lymphocyte development is regulated at multiple checkpoints, mediated by signals originating both inside and outside the cell. Two signaling pathways known to be essential in this process are interleukin-7 (IL-7) and the pre-B cell receptor (pBCR). We have shown previously that these signaling pathways intersect functionally. Specifically, response to low concentrations of IL-7 requires pBCR expression. In this report, we identify the ERK/MAP kinase pathway as a key regulatory component of this response. We propose a molecular mechanism for the selective expansion of pBCR(+) precursors and for the culling of inappropriately rearranged pro-B cells.
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