Pinus densiflora extract protects human skin fibroblasts against UVB-induced photoaging by inhibiting the expression of MMPs and increasing type I procollagen expression
Exposure to ultraviolet (UV) light can cause skin photoaging, which is associated with upregulation of matrix metalloproteinases (MMPs) and downregulation of collagen synthesis.It has been reported that MMPs, especially MMP-1, MMP-3 and MMP-9, decrease the Slide elasticity of the dermis by degrading collagen.In this study, we assessed the effects o