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. 1993 Jun;13(6):3714–3721. doi: 10.1128/mcb.13.6.3714

Characterization of a tumor necrosis factor-responsive element which down-regulates the human osteocalcin gene.

Y P Li 1, P Stashenko 1
PMCID: PMC359846  PMID: 8388544

Abstract

Tumor necrosis factor (TNF) down-regulates the production of bone matrix proteins by osteoblasts, thereby inhibiting bone formation. Osteocalcin, the major noncollagenous protein in bone, is inhibited by TNF at the transcriptional level. Mapping studies were undertaken to characterize the TNF-responsive element (TNFRE) in the osteocalcin promoter. Deletion analysis localized the TNFRE to the -522/-511 region, which contains a 9-bp palindromic motif (AGGCTGCCT). Promoter segments containing this sequence down-regulated a heterologous simian virus 40 promoter. Site-specific mutagenesis of the TNFRE eliminated TNF down-regulation. Mobility shift assays demonstrated that a constitutively expressed nuclear factor bound to the TNFRE; this factor was tentatively identified as the p50 homodimer of NF-kappa B. TNF stimulation induced a second TNFRE-binding protein which displaced the constitutive factor. The TNF-induced protein was not inhibitable by the NF-kappa B consensus sequence and was unreactive with anti-NF-kappa B antiserum. DNase footprinting demonstrated that both factors protected the -522/-501 portion of the promoter, consistent with the results of mapping studies and competitive mobility shift assays. It is hypothesized that the generalized catabolic activities of TNF in infectious and malignant diseases may be regulated via this novel element.

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