Abstract
Background and Objectives: Flashlamp pulsed-dye lasers (PDLs) has shown effectiveness in the treatment of keloids. In this study, we investigated whether PDL treatments decreased transforming growth factor-β1 (TGF-β1) - induction and up-regulation of matrix metalloproteinase (MMP) expression in keloid regression. Study Design/Materials and Methods: Keloid tissues obtained from 10 patients with intra-lesional or punch biopsies before and 7 days after PDL treatments [fluence per pulse was 10-18 J/cm2 (mean 14.0 J/cm2)]. Immunohistochemical (IHC) staining of TGF-β1 and MMP-1 and MMP-13 expressions in keloid tissue was performed. Western blot analysis of MMP-1 and MMP-13 expressions in extracellular matrix was evaluated. Results: IHC staining indicated that expression of TGF-β1 was significantly reduced in keloid tissues after PDL irradiation. MMP-13 but not MMP-1 expression on IHC staining significantly increased in extracellular matrix of keloid tissues after PDL treatment. Western blot analysis also showed MMP-13 but not MMP-1 significant increased in keloid tissues after PDL treatment. Conclusions: Regression of keloids regressed after PDL treatments are associated with down-regulation of TGF-β1 expression and up-regulation of MMP-13 activity.
| Original language | English |
|---|---|
| Pages (from-to) | 38-42 |
| Number of pages | 5 |
| Journal | Lasers in Surgery and Medicine |
| Volume | 36 |
| Issue number | 1 |
| DOIs | |
| State | Published - 01 2005 |
| Externally published | Yes |
Keywords
- Keloids
- Matrix metalloproteinase
- Pulsed-dye laser
- TGF-β1
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