SDF-1 responsiveness does not correlate with CXCR4 expression levels of developing human bone marrow B cells - PubMed (original) (raw)
. 1999 Nov 1;94(9):2990-8.
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- PMID: 10556181
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SDF-1 responsiveness does not correlate with CXCR4 expression levels of developing human bone marrow B cells
M Honczarenko et al. Blood. 1999.
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Abstract
Chemokines and their receptors are broadly expressed in different tissues and are involved in diverse biologic processes. Gene inactivation studies have shown that both stromal cell derived factor-1 (SDF-1) and chemokine receptor 4 (CXCR4) are essential for B lymphopoiesis. However, it is not yet clear by which mechanisms B lymphopoiesis is affected. In the present study, we have examined CXCR4 expression and function on primary B cells representing sequential stages of development (eg, pro-B, pre-B, immature, and mature B cells) in fetal and adult bone marrow. The expression of CXCR4 was observed to be sinusoidal. Expression was highest on pre-B cells, decreased as cells developed into immature B cells, and then increased again upon transition to the mature B-cell stage. The corresponding ligand SDF-1 was shown to trigger vigorous cell signaling and migration responses, which are restricted to early lineage B cells. The responsiveness to SDF-1 was markedly decreased for immature and mature B cells despite relatively high levels of CXCR4 expression. Thus, the diminished responsiveness to SDF-1 by more mature B cells was determined to be disproportionate to the level of CXCR4 expression. These findings raise the possibility that CXCR4 function is differentially controlled during B lymphopoiesis and may be relevant to the compartmentalization of B-cell precursors in the bone marrow.
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