title: Prevotella intermedia upregulates MMP-1 and MMP-8 expression in human periodontal ligament cells.
abstract: Prevotella intermedia, a major periodontal pathogen, plays important roles in the initiation and development of periodontitis by stimulating the release of proinflammatory cytokines, proteinases and matrix metalloproteinases (MMPs). Our previous study demonstrated that P. intermedia induced MMP-9 expression in human periodontal ligament (hPDL) cells. In this study, we examined the effects of P. intermedia on other MMPs' expression. Semi-quantitative reverse transcriptase (RT)-PCR analysis revealed that P. intermedia ATCC 25611 supernatant increased MMP-1 and MMP-8 mRNA expression in a concentration- and time-dependent manner. Enzyme-linked immunosorbent assay and Western blot results confirmed the RT-PCR results at the protein level. Cyclooxygenase inhibitor indomethacin significantly attenuated the upregulatory effects of P. intermedia on MMP-1 and MMP-8 expression. Extracellular signal-related kinase inhibitor PD98059 and c-Jun N-terminal kinase inhibitor SP600125 considerably decreased the upregulated level of MMP-1, whereas p38 inhibitor SB203580 markedly inhibited MMP-8 expression, suggesting that prostaglandin E(2) and mitogen-activated protein kinase signaling pathways are involved in P. intermedia-induced MMP-1 and MMP-8 upregulation. Our results indicate that P. intermedia might contribute to periodontal connective tissue and bone matrix destruction through upregulating MMP production.
authors.affiliation: Department of Oral Biology, School of Stomatology, The Fourth Military Medical University, 145 Chang Le Xi Road, Xi'an, China. jchsmg@fmmu.edu.cn
authors.forename: Su-Min
authors.initials: SM
authors.lastname: Guan
authors.forename: Lei
authors.initials: L
authors.lastname: Shu
authors.forename: Shan-Min
authors.initials: SM
authors.lastname: Fu
authors.forename: Bin
authors.initials: B
authors.lastname: Liu
authors.forename: Xiu-Li
authors.initials: XL
authors.lastname: Xu
authors.forename: Jun-Zheng
authors.initials: JZ
authors.lastname: Wu
mesh_terms: D000293:Adolescent; D015153:Blotting, Western; D002478:Cells, Cultured; D002648:Child; D004797:Enzyme-Linked Immunosorbent Assay; D020869:Gene Expression Profiling; D006801:Humans; D020781:Matrix Metalloproteinase 1 / Q000096:biosynthesis*; D020784:Matrix Metalloproteinase 8 / Q000096:biosynthesis*; D010513:Periodontal Ligament / Q000737:chemistry* / Q000382:microbiology*; D018713:Prevotella intermedia / Q000502:physiology*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015398:Signal Transduction; D015854:Up-Regulation
chemical_list: D020784:Matrix Metalloproteinase 8; D020781:Matrix Metalloproteinase 1