Expression of stromal cell-derived factor-1/pre-B cell growth-stimulating factor receptor, CXC chemokine receptor 4, on CD34+ human bone marrow cells is a phenotypic alteration for committed lymphoid progenitors
- PMID: 10490954
Expression of stromal cell-derived factor-1/pre-B cell growth-stimulating factor receptor, CXC chemokine receptor 4, on CD34+ human bone marrow cells is a phenotypic alteration for committed lymphoid progenitors
Abstract
We found that the stromal cell-derived factor-1/pre-B cell growth-stimulating factor receptor, CXC chemokine receptor 4 (CXCR4), is expressed on human CD34+ bone marrow (BM) cells. Stringently FACS-sorted CD34+CXCR4+ BM cells completely lack myeloid, erythroid, megakaryocytic, and mixed colony-forming potential (myeloid progenitors), but give rise to B and T lymphoid progenitors, whereas CD34+CXCR4- BM cells can generate colonies formed by myeloid progenitors and can also develop into these lymphoid progenitors. Therefore, expression of CXCR4 on CD34+ BM cells can allow lymphoid progenitors to be discriminated from myeloid progenitors. Because CD34+CXCR4+ cells are differentiated from CD34+CXCR4- cells, multipotential progenitors located in the BM are likely to be negative for CXCR4 expression. CXCR4 seems to be expressed earlier than the IL-7R and terminal deoxynucleotidyl transferase during early lymphohemopoiesis. These results suggest that the expression of CXCR4 on CD34+ BM cells is one of the phenotypic alterations for committed lymphoid progenitors.
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