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Basic Research
- The effect of tumor necrosis factor (TNF)-α to induce matrix metalloproteinase (MMPs) from the human dental pulp, gingival, and periodontal ligament cells
- Eun-Mi Rhim, Sang-Hyuk Park, Duck-Su Kim, Sun-Young Kim, Kyoung-Kyu Choi, Gi-Woon Choi
- J Korean Acad Conserv Dent 2011;36(1):26-36. Published online January 31, 2011
- DOI: https://doi.org/10.5395/JKACD.2011.36.1.26
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Abstract
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ePub Objectives In the present study, three kinds of tissues cells (pulp, gingiva, and periodontal ligament) were investigated if those cells express MMP and TIMP when they were stimulated with neuropeptides (substance P, CGRP) or proinflammatory cytokine, TNF-α.
Materials and Methods The cells cultured from human dental pulp (PF), gingiva (GF) and periodontal ligament were (PDLF) stimulated with Mock, SP, TNF-α, and CGRP for 24 hrs and 48 hrs. for an RNase protection assay and Enzyme Linked Immunosorbent Assay.
Cells (PF, GF and PDLF) seeded in 100 mm culture dish were stimulated with SP (10-5, 10-8 M) or only with medium (Mock stimulation) for 4hrs and for 24 hrs for RNase Protection Assay, and they were stimulated with CGRP (10-5 M) and TNF-α (2 ng/mL) for 24 hrs and with various concentraion of TNF-α (2, 10, and 100 ng/mL) for Rnase Protection Assay with a human MMP-1 probe set including MMP 1, 2, 8, 7, 8, 9, 12, and TIMP 2, 3.
In addition, cells (PF, GF and PDLF) were stimulated with Mock and various concentraion of TNF-α (2, 10, and 100 ng/mL) for 24 hrs and with TNF-α (10 ng/mL) for 48 hrs, and the supernatents from the cells were collected for Enzyme Linked Immunosorbent Assay (ELISA) for MMP-1 and MMP-13.
Results The expression of MMPs in PF, GF, PDLF after stimulation with SP and CGRP were not changed compared with Mock stimulation for 4 hrs and 24 hrs. The expression of MMP-1, -12, -13 24 hrs after stimulation with TNF-α were upregulated, however the expression of TIMP-3 in PF, GF, PDLF after stimulation with TNF-α were downregulated. TNF-α (2 ng/mL, 10 ng/mL, 100 ng/mL) increased MMP-1 and MMP-12 expression in PF dose dependently for 24 hrs.
Conclusions TNF-α in the area of inflammation may play an important role in regulating the remodeling of dentin, cementum, and alveolar bone.
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Original Article
- Anti-inflammatory effects of PPARγ on human dental pulp cells
- Jeong-Hee Kim
- J Korean Acad Conserv Dent 2006;31(3):203-214. Published online May 31, 2006
- DOI: https://doi.org/10.5395/JKACD.2006.31.3.203
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Abstract
PDFPubReaderePub
Dental pulp is a loose, mesenchymal tissue almost entirely enclosed in the dentin. It consists of cells, ground substance, and neural and vascular supplies. Damage to the dental pulp by mechanical, chemical, thermal, and microbial irritants can provoke various types of inflammatory response. Pulpal inflammation leads to the tissue degradation, which is mediated in part by Matrix metalloproteinase leads to accelerate extracellular matrix degradation with pathological pathway. We have now investigated the induction of MMPs and inflammatory cytokines by Lipopolysaccharide (LPS) control of inflammatory mediators by peroxisome proliferator-activated receptors (PPARs).
Human dental pulp cells exposed to various concentrations of LPS (1-10 µg/ml) revealed elevated levels of MMP-2 and MMP-9 at 24 hrs of culture. LPS also stimulated the production of ICAM-1, VCAM-1, IL-1β, and TNF-α. Adenovirus PPARγ (Ad/PPARγ) and PPARγ agonist rosiglitazone reduced the synthesis of MMPs, adhesion molecules and pro-inflammatory cytokines. The inhibitory effect of Ad/PPARγ was higher than that of PPARγ agonist.
These result offer new insights in regard to the anti-inflammatory potential of PPARγ in human dental pulp cell.
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