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Prepublished online as a Blood First Edition Paper on December 19, 2002; DOI 10.1182/blood-2002-04-1039.

Submitted April 4, 2002
Accepted November 27, 2002
Regulation of neutrophil and eosinophil secondary granule gene expression by transcription factors C/EBP and PU.1
Adrian F Gombart*, Scott H Kwok, Karen L Anderson, Yuji Yamaguchi, Bruce E Torbett, and H. Phillip Koeffler
Division of Hematology/Oncology, Cedars-Sinai Medical Center, Burns & Allen Research Institute, UCLA School of Medicine, Los Angeles, CA, USA
Departments of Molecular and Experimental Medicine and Immunology, The Scripps Research Institute, La Jolla, CA, USA
Center for Sleep Respiratory Disorders at Fukoka, Fukoka, Japan
* Corresponding author; email: gombarta{at}csmc.edu.
In the bone marrow of C/EBP -/- mice, expression of neutrophil secondary and tertiary granule mRNAs is absent for lactoferrin (LF), neutrophil gelatinase (NG), murine cathelin-like protein (MCLP) and the cathelin B9; and severely reduced for neutrophil collagenase (NC) and neutrophil gelatinase-associated lipocalin (NGAL). Also, expression of eosinophil granule genes, major basic protein (MBP) and eosinphil peroxidase (EPX) is absent. These mice express C/EBP , C/EBP and C/EBP in the bone marrow at levels similar to their wild type counterparts suggesting a lack of functional redundancy among the family in vivo. Stable inducible expression of C/EBP and C/EBP in the murine fibroblast cell line NIH 3T3 activated expression of mRNAs for B9, MCLP, NC and NGAL, but not LF. In transient transfections of C/EBP and C/EBP , B9 was strongly induced with weaker induction of the other genes. The C/EBP and C/EBP proteins weakly induced B9 expression, but C/EBP induced NC expression more efficiently than the other C/EBPs. The expression of MBP was inefficiently induced by C/EBP alone and weakly induced with C/EBP and GATA-1, but the addition of PU.1 resulted in a striking cooperative induction of MBP in NIH 3T3 cells. Mutation of a predicted PU.1 site in the human MBP promoter-luciferase reporter construct abrogated the response to PU.1. Gel shift analysis demonstrated binding of PU.1 to this site. MBP and EPX mRNAs were absent in a PU.1-null myeloid cell line established from the embryonic liver of PU.1-/- mice. Restitution of PU.1 gene expression restored MBP and EPX gene expression. This study demonstrates that C/EBP is essential and sufficient for the expression of a particular subset of neutrophil secondary granule genes. Furthermore, it indicates the importance of PU.1 in the cooperative activation of eosinophil granule genes.

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