Transcription Factor Gfi-1 Induced by G-CSF is a Negative Regulator of CXCR4 in Myeloid Cells

Overview

Journal Blood

Publisher Elsevier

Specialty Hematology

Date 2007 Jun 29

PMID 17596540

Citations 32

Authors

Maria De La Luz Sierra

Paola Gasperini

Peter J McCormick

Jinfang Zhu

Giovanna Tosato

Affiliations

Soon will be listed here.

Abstract

The mechanisms underlying granulocyte-colony stimulating factor (G-CSF)-induced mobilization of granulocytic lineage cells from the bone marrow to the peripheral blood remain elusive. We provide evidence that the transcriptional repressor growth factor independence-1 (Gfi-1) is involved in G-CSF-induced mobilization of granulocytic lineage cells from the bone marrow to the peripheral blood. We show that in vitro and in vivo G-CSF promotes expression of Gfi-1 and down-regulates expression of CXCR4, a chemokine receptor essential for the retention of hematopoietic stem cells and granulocytic cells in the bone marrow. Gfi-1 binds to DNA sequences upstream of the CXCR4 gene and represses CXCR4 expression in myeloid lineage cells. As a consequence, myeloid cell responses to the CXCR4 unique ligand SDF-1 are reduced. Thus, Gfi-1 not only regulates hematopoietic stem cell function and myeloid cell development but also probably promotes the release of granulocytic lineage cells from the bone marrow to the peripheral blood by reducing CXCR4 expression and function.

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