ISSN:
1524-475X
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Medicine
Notes:
Aim: When surgery with postoperative superficial electron irradiation is applied, the recurrence rate of keloid lesion has been found to be 〈30%. In this study, we assessed the molecular changes underlying the effect of electron irradiation by differential global gene expression analyses of both cultured keloid and normal skin fibroblasts. Materials and Methods: Primary cultured fibroblasts from 4 active keloids and their adjacent normal dermal tissues were irradiated at a calibrated dosage of 15 Gy with 6 MeV electron beam generated by a linear accelerator. Corresponding paired non-irradiated cells were used as control. RNA isolated from the collected cells was labeled with 33P, hybridized to the cDNA microarray gene filters and analyzed. Results: After irradiation, the gene expression profiles of keloid and normal skin fibroblasts were closely similar. Electron irradiated keloid fibroblasts showed suppressed levels of collagen typeI (alpha2), collagen typeVI (alpha1), matrix metalloproteinase 2, fibronectin 1, insulin-like growth factor binding protein 3, alpha-1-antichymotorypsin and heparan glucosaminyl 1 as compared with their non–irradiated counterparts. Conclusions: Downregulation of matrix synthesis and upregulation of protease inhibitors and apoptosis promoting genes by electron irradiation may inhibit keloid development. This mode of therapy appears to exert a positive effect toward lowering the recurrence rate of keloid formation.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1067-1927.2004.abstractw.x
