CCAAT/enhancer binding protein β regulates expression of matrix metalloproteinase-3 in arthritis

Hidetoshi Tsushima, Ken Okazaki, Mitsumasa Hayashida, Takahiro Ushijima, Yukihide Iwamoto

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


Objectives: To investigate whether CCAAT/enhancer binding protein β (C/EBPβ) mediates the expression of matrix metalloproteinase-3 (MMP-3) and aggrecanases in arthritis. Methods: Localisation of C/EBPβ and MMP-3 in synovium and cartilage from patients with rheumatoid arthritis and osteoarthritis was determined by immunohistochemistry. Cell lines SW982, C28/I2 and human fibroblast-like synoviocytes stimulated by interleukin 1β (IL-β) were subjected to western blotting and quantitative PCR. Overexpression of C/EBPβ by adenovirus was performed in cells and organ culture of normal cartilage. Knockdown of C/EBPβ by small interference RNA was performed in cells. Activity of the human MMP-3 and aggrecanase-2 ADAMTS-5 (a disintegrin and metalloproteinase with thrombospondin motifs) promoters was analysed by a luciferase assay. To determine whether C/EBPβ directly binds to the MMP-3 or ADAMTS-5 promoter, a chromatin immunoprecipitation assay was performed. Results Immunohistochemistry showed that C/EBPβ and MMP-3 were co-localised in arthritic synovium and cartilage. Western blots revealed increased C/ EBPβ expression in cells treated with IL-1β. Expression of MMP-3, MMP-13 and ADAMTS-5 mRNA was significantly increased by the overexpression of C/EBPβ. C/EBPβ stimulated MMP-3 expression and induced matrix degradation in cartilage explants. C/EBPβ knockdown reduced MMP-3 and ADAMTS-5 expression. C/EBPβ stimulated the 2011 bp MMP-3 promoter and the 1768 bp ADAMTS-5 promoter in a dose-dependent manner. Deletion and mutation analysis of the MMP-3 promoter showed that the C/EBPβ core responsive element was located between -108 bp and -100 bp. The chromatin immunoprecipitation assay showed that C/EBPβ was directly bound to MMP-3 and ADAMTS-5 promoters. Conclusions: These data demonstrate that C/EBPβ is involved in expression of MMP-3 and ADAMTS-5 in arthritic synovium and cartilage.

Original languageEnglish
Pages (from-to)99-107
Number of pages9
JournalAnnals of the Rheumatic Diseases
Issue number1
Publication statusPublished - Jan 2012

All Science Journal Classification (ASJC) codes

  • Immunology and Allergy
  • Rheumatology
  • Immunology
  • Biochemistry, Genetics and Molecular Biology(all)


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