Abstract
We report that the chemokine receptor CXCR4 is required for the retention of B lineage and granulocytic precursors within fetal liver and bone marrow microenvironment. In CXCR4-deficient embryos, pro-B cells are present in blood but hardly detectable in liver; myeloid cells are elevated in blood and reduced in liver compared to wild-type embryos. Mice reconstituted with CXCR4-deficient fetal liver cells have reduced donor-derived mature B lymphocytes in blood and lymphoid organs. The numbers of pro-B and pre-B cells are reduced in bone marrow and abnormally high in blood. Granulocytic cells are reduced in bone marrow but elevated and less mature in the blood. B lineage and granulocytic precursors are released into the periphery in absence of CXCR4.
Publication types
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Research Support, Non-U.S. Gov't
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Animals
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B-Lymphocytes / cytology*
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B-Lymphocytes / immunology
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Bone Marrow Cells / cytology
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Bone Marrow Cells / immunology*
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Cell Lineage / genetics
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Cell Lineage / immunology
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Cells, Cultured
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Chimera / immunology
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Female
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Fetal Tissue Transplantation / immunology
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Granulocytes / cytology*
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Hematopoiesis / genetics
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Hematopoiesis / immunology
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Hematopoietic Stem Cells / cytology
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Hematopoietic Stem Cells / immunology*
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Liver Transplantation / immunology
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Lymphocytes / cytology
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Lymphoid Tissue / cytology
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Lymphoid Tissue / immunology
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Male
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Mice
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Mice, Inbred C57BL
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Mice, Mutant Strains
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Receptors, CXCR4 / deficiency
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Receptors, CXCR4 / genetics
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Receptors, CXCR4 / physiology*