title: TGF-beta induces expression of monocyte chemoattractant JE/monocyte chemoattractant protein 1 via transcriptional factor AP-1 induced by protein kinase in osteoblastic cells.
abstract: In this work, we demonstrate the signal-transducing mechanism of TGF-beta 1 for gene expression of monocyte chemoattractant JE/monocyte chemoattractant protein 1 (MCP-1) in clonal osteoblastic MC3T3-E1 cells. TGF-beta 1-induced JE/MCP-1 gene expression in the cells was inhibited markedly by H-7 (1-(5-isoguinolinesulfonyl)-2-O-methylpiperazine-dihydrochloride) and staurosporine, potent inhibitors of protein kinase. TGF-beta 1-induced expression of both early proto-oncogenes c-fos and c-jun in the cells was also inhibited by H-7 and staurosporine. Antisense oligonucleotides to c-fos and c-jun genes inhibited significantly the cytokine-induced JE/MCP-1 gene expression. Curcumin, a specific inhibitor of c-jun/AP-1, inhibited the cytokine-induced c-jun gene expression in a dose-dependent manner, though the c-fos gene expression was not affected. TGF-beta 1 stimulated transcriptionally the JE/MCP-1 gene expression, and this stimulation was inhibited significantly by curcumin. Curcumin-induced inhibition of the JE/MCP-1 gene product was also evidenced by both an assay involving immunoprecipitation with antiserum specific for JE/MCP-1 and an assay for monocyte chemotaxis. Curcumin markedly inhibited AP-1 binding activity to 12-tetradecanoyl phorbol-13-acetate-responsive element (TRE) in the cytokine-treated cells. Furthermore, H-7 and staurosporine also inhibited the binding activity to TRE in the cells treated by the cytokine. These results demonstrate that TGF-beta 1 induces expression of monocyte chemoattractant JE/MCP-1 via the transcriptional factor AP-1 induced by protein kinase in the osteoblastic cells.
authors.affiliation: Department of Oral Microbiology, Meikai University School of Dentistry, Saitama, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Takeshita
authors.forename: Y
authors.initials: Y
authors.lastname: Chen
authors.forename: A
authors.initials: A
authors.lastname: Watanabe
authors.forename: S
authors.initials: S
authors.lastname: Kitano
authors.forename: S
authors.initials: S
authors.lastname: Hanazawa
mesh_terms: D019307:1-(5-Isoquinolinesulfonyl)-2-Methylpiperazine; D016475:3T3 Cells; D000470:Alkaloids / Q000494:pharmacology; D000818:Animals; D001483:Base Sequence; D018932:Chemokine CCL2; D002630:Chemotactic Factors / Q000235:genetics*; D016207:Cytokines / Q000096:biosynthesis; D004791:Enzyme Inhibitors / Q000494:pharmacology; D015870:Gene Expression / Q000187:drug effects; D005786:Gene Expression Regulation / Q000235:genetics; D016762:Genes, fos / Q000502:physiology; D016758:Genes, jun / Q000502:physiology; D006801:Humans; D007546:Isoquinolines / Q000494:pharmacology; D051379:Mice; D008969:Molecular Sequence Data; D016376:Oligonucleotides, Antisense / Q000494:pharmacology; D010006:Osteoblasts / Q000201:enzymology*; D010879:Piperazines / Q000494:pharmacology; D011493:Protein Kinase C / Q000037:antagonists & inhibitors; D047428:Protein Kinase Inhibitors; D011494:Protein Kinases / Q000502:physiology*; D015398:Signal Transduction / Q000502:physiology; D019311:Staurosporine; D018808:Transcription Factor AP-1 / Q000502:physiology*; D014158:Transcription, Genetic / Q000502:physiology; D016212:Transforming Growth Factor beta / Q000502:physiology*
chemical_list: D000470:Alkaloids; D018932:Chemokine CCL2; D002630:Chemotactic Factors; D016207:Cytokines; D004791:Enzyme Inhibitors; D007546:Isoquinolines; D016376:Oligonucleotides, Antisense; D010879:Piperazines; D047428:Protein Kinase Inhibitors; D018808:Transcription Factor AP-1; D016212:Transforming Growth Factor beta; D019307:1-(5-Isoquinolinesulfonyl)-2-Methylpiperazine; D011494:Protein Kinases; D011493:Protein Kinase C; D019311:Staurosporine