|
||
J. Exp. Med.,
Volume 188, Number 6, September 21, 1998 1173-1184
(C/EBP
)
Is Critical for Granulopoiesis
By

From the * Division of Hematology/Oncology, Department of Medicine, Beth Israel Deaconess Medical
Center and Harvard Medical School, Boston, Massachusetts 02215; the Cytokines stimulate granulopoiesis through signaling via receptors whose expression is controlled by lineage-specific transcription factors. Previously, we demonstrated that granulocyte
colony-stimulating factor (G-CSF) receptor mRNA was undetectable and granulocyte maturation blocked in CCAAT enhancer binding protein
Department of Pathology
and Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas 77030; and the § Division of Bone Marrow Transplantation and Stem Cell Biology, Department of Medicine,
Washington University Medical School, St. Louis, Missouri 63110-1093
(C/EBP
)-deficient mice. This phenotype is distinct from that of G-CSF receptor
/
mice, suggesting that other genes are likely to
be adversely affected by loss of C/EBP
. Here we demonstrate loss of interleukin 6 (IL-6) receptor and IL-6-responsive colony-forming units (CFU-IL6) in C/EBP
/
mice. The observed failure of granulopoiesis could be rescued by the addition of soluble IL-6 receptor and
IL-6 or by retroviral transduction of G-CSF receptors, demonstrating that loss of both of these
receptors contributes to the absolute block in granulocyte maturation observed in C/EBP
-deficient hematopoietic cells. The results of these and other studies suggest that additional C/EBP
target genes, possibly other cytokine receptors, are also important for the block in granulocyte
differentiation observed in vivo in C/EBP
-deficient mice.
This article has been cited by other articles:
| TABLE OF CONTENTS |
|