LAUSR

UVA can penetrate dermis and cause functional damage of dermal fibroblasts leading photoaging. Ginseng is a widely used traditional Chinese medicine for skin aging. However, its effects on skin photoaging induced by UVA are not clear. In this study, we isolated ginseng proteins (GP), with molecular weights of 27 kDa and 13 kDa, and found that they alleviated the inhibitory effects of UVA on cell viability and increased percentage of NIH‐3T3 fibroblasts in the S phase of cells cycle. GP also improved cell contraction ability, increased the expression and secretion of CoL‐I, similar to MAPK phosphorylation inhibitors and reduced expression and secretion of MMP‐1, MMP‐2 and MMP‐9 as well as the enzyme activities of MMP‐2 and MMP‐9. They reduced ROS content, DNA damage and 8‐OHdG content, as well as the protein expression of p53, p21 and p16. The levels of p‐ERK, p‐p38 and p‐JNK, p‐c‐Fos and p‐c‐Jun proteins were decreased by GP. Inactivated GP did not inhibit the cellular activity and expression and secretion of CoL‐I irradiated by UVA. The results showed that GP can improve cell viability and contractile function by inhibiting DNA damage and collagen degradation to inhibit the photoaging effects of skin dermal cells caused by UVA.