α-Lipoic acid inhibit the decrease of collagen deposition in ultravioled B-irradiated cultured normal human skin fibroblasts cell culture
Arum Krismi Satiti Retno Pudjiati Yohanes Widodo Wirohadidjojo
(1*)
(1) 
(*) Corresponding Author
Abstract
Repeated ultraviolet B (UVB) irradiation on human skin has been considered to be responsible in premature aging process because UVB has been proved to inhibit collagen deposition and accelerates collagen degradation. Clinical studies showed that topical usage of 5% α-lipoic acid (ALA) improved the clinical appearance of photoaged skin. However, the effect of ALA on collagen deposition and degradation in UVB-irradiated normal human skin fibroblasts culture has not been reported. The aim of the study was to investigate the effect of ALA on collagen deposition and degradation in UVB-irradiated cultured normal human skin fibroblasts. Culture of normal human skin fibroblasts were treated with 0, 125, 250, 500 μM ALA diluted in complete Dulbecco’s Modified Eagle’s Medium (DMEM) and irradiated with 300 mJ/cm2 UVB. The mean collagen deposition and degradation’s level were measured by Sirius red assay and read with spectrophotometer at λ 550 nm. Mean difference of collagen deposition as expressed by optical density (OD) between normal human skin fibroblasts cell after UVB irradiation and without UVB irradiation was analyzed by Wilcoxon signed-ranks test and Friedman test, while mean difference collagen degradation was analyzed by one way analysis of variance (ANOVA) and paired t test with 95% confidence level (p<0.05). The results showed that ALA 125 μM inhibited the decrease of collagen deposition significantly (p<0.05), though higher concentrations did not. However, ALA did not inhibit collagen degradation increment (p>0.05). In conclusion, ALA inhibited the decrease of collagen deposition, but did not inhibit collagen degradation in UVB-irradiated normal human skin fibroblasts culture. Key words: α-lipoic acid - collagen - human skin - fibroblasts – UVB - irradiation
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