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Blood, 15 March 2008, Vol. 111, No. 6, pp. 2999-3004. Prepublished online as a Blood First Edition Paper on December 4, 2007; DOI 10.1182/blood-2007-04-087213.
HEMATOPOIESIS AND STEM CELLS Impaired response to GM-CSF and G-CSF, and enhanced apoptosis in C/EBPβ-deficient hematopoietic cells1 Division of Hematology and Oncology, Cedars-Sinai Medical Center, University of California Los Angeles School of Medicine; and 2 Department of Host Defense, Research Institute for Microbial Diseases, Osaka University, Osaka, Japan
Transcription factors known as CCAAT enhancer binding proteins (C/EBPs) are involved in hematopoietic differentiation, including myelopoiesis and granulopoiesis. C/EBPβ-deficient mice develop normally; however, they exhibit defective macrophage function, resulting in increased susceptibility to infection. Little is known about the role of C/EBPβ in granulopoiesis; therefore, we examined granulopoiesis in C/EBPβ-deficient mice. Morphology, the number of peripheral blood and bone marrow cells, and the expression of genes specific for the myeloid lineage were normal in C/EBPβ-deficient mice. Interestingly, the hematopoietic progenitor cells of C/EBPβ-deficient mice did not respond normally to granulocyte/macrophage-colony stimulating factor and granulocyte colony stimulating factor. In addition, C/EBPβ-deficient neutrophils displayed enhanced apoptosis compared with wild-type neutrophils. Our present results indicate that C/EBPβ helps regulate survival of neutrophils, downstream of the granulocyte colony stimulating factor receptor.
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