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Functional characterization of human osteoclast inhibitory peptide-1 (OIP-1/hSca) gene promoter.

ABSTRACT: We have recently identified and characterized the human osteoclast (OCL) inhibitory peptide-1 (OIP-1/hSca), a member of Ly-6 gene family. OIP-1 is an important physiologic regulator of OCL development and bone resorption activity. To determine the molecular mechanisms that regulate OIP-1 gene expression in OCL precursor cells, we isolated and characterized the OIP-1/hSca gene (2 Kb) promoter sequence. IFN-gamma (50 ng/ml) treatment of RAW 264.7 macrophage cells transfected with OIP-1 gene (-1 to -1988 bp relative to transcription start site) promoter-luciferase reporter plasmid demonstrated a significant (4 fold) increase in OIP-1 gene promoter activity. Sequence analysis of OIP-1 gene promoter region further identified a potential Stat-1 binding motif at -1629 to -1639 bp position. Stat-1 specific inhibitor, fludarabine (50 muM) abolished IFN-gamma stimulated OIP-1 gene promoter activity. Electrophoretic mobility shift assay (EMSA) further confirmed activated Stat-1 binding to the OIP-1 gene promoter sequence suggesting that IFN-gamma regulates OIP-1 gene expression in OCL precursor cells through a Stat-1 dependent signaling pathway. We further show that knock-down of TRADD enhances IFN-gamma signaling to increase OIP-1 gene expression in OCL precursor cells. These results should provide insights into the molecular control of OIP-1 gene expression and inhibition of OCL activity in the bone microenvironment.

SUBMITTER: Srinivasan S

PROVIDER: S-EPMC2787104 | biostudies-literature | 2006 Apr

REPOSITORIES: biostudies-literature

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Functional characterization of human osteoclast inhibitory peptide-1 (OIP-1/hSca) gene promoter.

Srinivasan Shanmugarajan S Ito Masahiro M Kajiya Hiroshi H Key L Lyndon LL Johnson-Pais Theresa L TL Reddy Sakamuri V SV

Gene 20051227 1

We have recently identified and characterized the human osteoclast (OCL) inhibitory peptide-1 (OIP-1/hSca), a member of Ly-6 gene family. OIP-1 is an important physiologic regulator of OCL development and bone resorption activity. To determine the molecular mechanisms that regulate OIP-1 gene expression in OCL precursor cells, we isolated and characterized the OIP-1/hSca gene (2 Kb) promoter sequence. IFN-gamma (50 ng/ml) treatment of RAW 264.7 macrophage cells transfected with OIP-1 gene (-1 to ...[more]

PMID: 16380218

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Project description:The inducible IkappaB kinase (IKKi/IKKepsilon) is a recently described serine-threonine kinase that activates the transcription factors NFkappaB, interferon regulatory factor-3 (IRF3) and CCAAA/enhancer-binding protein (C/EBPdelta). Several inflammatory agents have been shown to induce the expression of the IKKi gene in macrophages and other cell types but the mechanism is unknown. We have found that the IKKi expression was constitutive in human chondrocytes from OA cartilage and a human chondrocytic cell line C28/I2 but was up-regulated by the inflammatory cytokines TNFalpha or IL-1betain an NFkappaB-dependent manner. To understand the constitutive and inducible expression of the IKKi gene we localized the transcription start site (TSS), cloned and sequenced a 2 kb genomic DNA fragment 5' of the TSS and characterized the putative promoter region (PPR), and identified the motifs therein that are required for basal and cytokine-induced IKKi gene promoter activity. We found that IKKi core promoter was TATA-less and by using PCR generated deletion mutants of the PPR we found that the cis-elements responsible for basal transcriptional activity were located between -51 and -100 bp upstream of the TSS while the cytokine response elements were located distally between -501 and -1000 bp upstream of the TSS. The DNA region containing the cytokine response elements had two kappaB sites as the most relevant regulatory motifs. The results of site-directed mutagenesis revealed that the kappaB site located between -833 and -847 bp upstream of the TSS was biologically functional and required for cytokine-induced IKKi promoter activity in human chondrocytes and HeLa cells. The silence of the other kappaB site (-816/-802) was positional, rather than sequence-specific. Over-expression of NFkappaB p65 mimics the TNFalpha-induced activation of the IKKi promoter. Also the gel shift assay suggested that NFkappaB p65 is responsible for activation of the IKKi promoter. These data for the first time characterize the promoter region and provide further insights into the transcriptional regulation of IKKi in human chondrocytes and other cell types.

Dataset Information

Functional characterization of human osteoclast inhibitory peptide-1 (OIP-1/hSca) gene promoter.

Publications

Functional characterization of human osteoclast inhibitory peptide-1 (OIP-1/hSca) gene promoter.

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