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J Biol Chem, Vol. 274, Issue 15, 10609-10617, April 9, 1999

CCAAT/Enhancer-binding Protein delta  Is a Critical Regulator of Insulin-like Growth Factor-I Gene Transcription in Osteoblasts

Yutaka UmayaharaDagger , Julia BilliardDagger , Changhua Ji§, Michael Centrella§, Thomas L. McCarthy§, and Peter RotweinDagger

From the Dagger  Oregon Health Sciences University, Molecular Medicine Division, Department of Medicine, Portland, Oregon 97201-3098 and § Yale University School of Medicine, Section of Plastic Surgery, New Haven, Connecticut 06520-8041

Insulin-like growth factor-I (IGF-I) plays a major role in promoting skeletal growth by stimulating bone cell replication and differentiation. Prostaglandin E2 and other agents that induce cAMP production enhance IGF-I gene transcription in cultured rat osteoblasts through a DNA element termed HS3D, located in the proximal part of the major rat IGF-I promoter. We previously determined that CCAAT/enhancer-binding protein delta  (C/EBPdelta ) is the key cAMP-stimulated regulator of IGF-I transcription in these cells and showed that it transactivates the rat IGF-I promoter through the HS3D site. We now have defined the physical-chemical properties and functional consequences of the interactions between C/EBPdelta and HS3D. C/EBPdelta , expressed in COS-7 cells or purified as a recombinant protein from Escherichia coli, bound to HS3D with an affinity at least equivalent to that of the albumin D-site, a known high affinity C/EBP binding sequence, and both DNA elements competed equally for C/EBPdelta . C/EBPdelta bound to HS3D as a dimer, with protein-DNA contact points located on guanine residues on both DNA strands within and just adjacent to the core C/EBP half-site, GCAAT, as determined by methylation interference footprinting. C/EBPdelta also formed protein-protein dimers in the absence of interactions with its DNA binding site, as indicated by results of glutaraldehyde cross-linking studies. As established by competition gel-mobility shift experiments, the conserved HS3D sequence from rat, human, and chicken also bound C/EBPdelta with similar affinity. We also found that prostaglandin E2-induced expression of reporter genes containing human IGF-I promoter 1 or four tandem copies of the human HS3D element fused to a minimal promoter and show that these effects were enhanced by a co-transfected C/EBPdelta expression plasmid. Taken together, our results provide evidence that C/EBPdelta is a critical activator of IGF-I gene transcription in osteoblasts and potentially in other cell types and species.

Copyright © 1999 by The American Society for Biochemistry and Molecular Biology, Inc.
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