Peptidoglycan enhances transcriptional expression of CCAAT/enhancer-binding protein delta gene in mouse macrophages.

Yu Chiuan Huang, Wen Chang Chang, Jyan Gwo J Su, Jheng Liang Cai, Chun Chia Chen, Jan Jong Hung, Yi Wen Liu

研究成果: 雜誌貢獻文章同行評審

4 引文 斯高帕斯(Scopus)


Peptidoglycan-activated gene expression is mediated through various transcription factors including CCAAT/enhancer-binding protein delta (C/EBPdelta). The purpose of the present study is to elucidate the mechanism of PGN-activated C/EBPdelta gene. PGN stimulated C/EBPdelta protein and mRNA expression in mouse macrophages RAW 264.7 cells. Analysis of C/EBPdelta promoter activity by luciferase reporter assay indicated that PGN-induced C/EBPdelta gene activation is partially mediated by the -345 to +24 bp of C/EBPdelta gene promoter. The in vitro protein-DNA binding assay showed that Sp1, c-Rel and c-Jun are the major protein binding to this PGN-response element of C/EBPdelta promoter, and the binding of c-Rel and c-Jun is increased after PGN treatment. All of these binding activities were abolished when Sp1-, NF-kappaB/APRE-, CRE-sites were mutated. Furthermore, analysis of this promoter region by site-directed mutants constructed in luciferase reporter vector indicated that two Sp1-sites, one NF-kappaB/APRE-site and one CRE-site are prominent for PGN-induced gene expression. In addition, when Sp1, c-Rel or c-Jun transcription factors were overexpressed in cells, all of them enhanced C/EBPdelta promoter activity. In summary, we suggest that Sp1, c-Rel and c-Jun transcription factors play important roles in activation of C/EBPdelta gene promoter under the stimulation of PGN. Given the importance of C/EBPdelta in inflammatory disease, these results reveal a clue as a potential therapeutic target for suppression of C/EBPdelta expression under PGN stimulation.

頁(從 - 到)407-418
期刊Journal of Biomedical Science
出版狀態已發佈 - 5月 2007

ASJC Scopus subject areas

  • 生物化學、遺傳與分子生物學 (全部)


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