title: Novel transcription-factor-like function of human matrix metalloproteinase 3 regulating the CTGF/CCN2 gene.
abstract: Matrix metalloproteinase 3 (MMP3) is well known as a secretory endopeptidase that degrades extracellular matrices. Recent reports indicated the presence of MMPs in the nucleus (A. J. Kwon et al., FASEB J. 18:690-692, 2004); however, its function has not been well investigated. Here, we report a novel function of human nuclear MMP3 as a trans regulator of connective tissue growth factor (CCN2/CTGF). Initially, we cloned MMP3 cDNA as a DNA-binding factor for the CCN2/CTGF gene. An interaction between MMP3 and transcription enhancer dominant in chondrocytes (TRENDIC) in the CCN2/CTGF promoter was confirmed by a gel shift assay and chromatin immunoprecipitation. The CCN2/CTGF promoter was activated by overexpressed MMP3, whereas a TRENDIC mutant promoter lost the response. Also, the knocking down of MMP3 suppressed CCN2/CTGF expression. By cytochemical and histochemical analyses, MMP3 was detected in the nuclei of chondrocytic cells in culture and also in the nuclei of normal and osteoarthritic chondrocytes in vivo. The nuclear translocation of externally added recombinant MMP3 and six putative nuclear localization signals in MMP3 also were shown. Furthermore, we determined that heterochromatin protein gamma coordinately regulates CCN2/CTGF by interacting with MMP3. The involvement of this novel role of MMP3 in the development, tissue remodeling, and pathology of arthritic diseases through CCN2/CTGF regulation thus is suggested.
authors.affiliation: Department of Biochemistry and Molecular Dentistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, 2-5-1, Shikata-cho, Okayama City, Okayama, Japan. takigawa@md.okayama-u.ac.jp
authors.forename: Takanori
authors.initials: T
authors.lastname: Eguchi
authors.forename: Satoshi
authors.initials: S
authors.lastname: Kubota
authors.forename: Kazumi
authors.initials: K
authors.lastname: Kawata
authors.forename: Yoshiki
authors.initials: Y
authors.lastname: Mukudai
authors.forename: Junji
authors.initials: J
authors.lastname: Uehara
authors.forename: Toshihiro
authors.initials: T
authors.lastname: Ohgawara
authors.forename: Soichiro
authors.initials: S
authors.lastname: Ibaragi
authors.forename: Akira
authors.initials: A
authors.lastname: Sasaki
authors.forename: Takuo
authors.initials: T
authors.lastname: Kuboki
authors.forename: Masaharu
authors.initials: M
authors.lastname: Takigawa
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D045744:Cell Line, Tumor / Q000378:metabolism; D002467:Cell Nucleus / Q000378:metabolism; D019902:Chondrocytes / Q000378:metabolism*; D055513:Connective Tissue Growth Factor; D016384:Consensus Sequence; D004742:Enhancer Elements, Genetic / Q000235:genetics*; D005260:Female; D005786:Gene Expression Regulation / Q000235:genetics*; D006801:Humans; D017874:Immediate-Early Proteins / Q000096:biosynthesis / Q000235:genetics*; D036341:Intercellular Signaling Peptides and Proteins / Q000096:biosynthesis / Q000235:genetics*; D019278:Matrix Metalloproteinase 3 / Q000502:physiology*; D051379:Mice; D008807:Mice, Inbred BALB C; D008969:Molecular Sequence Data; D010003:Osteoarthritis / Q000378:metabolism; D011480:Protease Inhibitors / Q000494:pharmacology; D051381:Rats; D017208:Rats, Wistar; D011993:Recombinant Fusion Proteins / Q000502:physiology; D016415:Sequence Alignment; D012689:Sequence Homology, Nucleic Acid
chemical_list: C526317:CCN2 protein, human; C526318:CCN2 protein, mouse; C526316:CCN2 protein, rat; D017874:Immediate-Early Proteins; D036341:Intercellular Signaling Peptides and Proteins; D011480:Protease Inhibitors; D011993:Recombinant Fusion Proteins; D055513:Connective Tissue Growth Factor; C511768:MMP3 protein, human; D019278:Matrix Metalloproteinase 3