The effect of dehydroglyasperin C on UVB–mediated MMPs expression in human HaCaT cells

Background the ultraviolet b (uvb) from solar radiation increases the generation of reactive oxygen species (ros),which mediate the production of matrix metalloproteinases (mmps),and acts mainly on the epidermis layer of the skin. this study was aimed at assessing the anti-photoaging effects of dehydroglyasperin c isolated from glycyrrhiza uralensis fisch on mmps levels in hacat human keratinocytes and to elucidate the underlying mechanism. methods the cell viability was measured by mtt assay. expression,phosphorylation and enzymatic activity of the protein were examined using elisa,western blot or gelatin zymography. intracellular ros measurement was evaluated by fluorescent elisa and 2′,7′-dichlorodihydrofluorescein diacetate (h2dcf-da) assay. results in the present study,we found that dehydroglyasperin c markedly inhibited uvb-mediated expression of collagenase (mmp-1) and gelatinase (mmp-9) by inhibiting ros generation. dehydroglyasperin c treatment also decreased the uvb irradiation-mediated activation of mitogen-activated protein kinase (mapk),c-jun phosphorylation,and c-fos expression. in addition,the down-regulation of uvb-induced c-jun phosphorylation caused by dehydroglyasperin c treatment was more than the down-regulation of c-fos expression in the hacat human keratinocytes. conclusion our results indicated that dehydroglyasperin c may function as a potential anti-photoaging agent by inhibiting uvb-mediated mmps expression via suppression of mapk and ap-1 signaling. © 2017 institute of pharmacology,polish academy of sciences