Skipjack (Katsuwonus pelamis) elastin hydrolysate‐derived peptides attenuate UVA irradiation‐induced cell damage in human HaCaT keratinocytes

Abstract We aimed to identify skipjack elastin hydrolysate‐derived peptides, and explore its mechanism of photoprotection against ultraviolet A (UVA) induced skin damage. Two peptides, TGVLTVM (peptide A) and NHIINGW (peptide B), were successfully identified using Sephadex G‐15, analyzed and detected using LC‐MS/MS fitted with electrospray ionization (ESI‐MS/MS), and further synthesized using the Fmoc strategy. A UVA radiation‐induced damage cell model of Human keratinocytes cell line (HaCaT) was established and applied. We found that both peptides significantly reduced reactive oxygen species (ROS) generation, reversed mitochondrial membrane potential (MMP) by 12.40%–13.13% and 10.80%–12.90% and reduced cell apoptosis by 3.43%–6.44%, and 4.56%–6.03% for peptide A and B, respectively, compared to the UVA model group. In conclusion, peptides TGVLTVM and NHIINGW protected against UVA‐induced photoaging through the attenuation of oxidative stress, thus both peptides might be useful as promising ingredients in sunscreens or antiaging cosmetic products.