Exploration of the Anti-Photoaging Mechanisms of Lactiplantibacillus plantarum TWK10 in a UVB-Induced Mouse Model

Functional foods have shown promise in mitigating skin aging. This study aimed to evaluate the effects of Lactiplantibacillus plantarum TWK10 (LPTWK10) and its spray-dried supernatant powder on ultraviolet B (UVB)-induced skin photoaging in female BALB/c nude mice. Over a 13-week period of UVB exposure and concurrent administration of high doses of LPTWK10 or its spray-dried fermentation supernatant, significant improvements were observed, skin wrinkles were notably reduced, transepidermal water loss rate decreased by 68.94–70.77%, and stratum corneum hydration increased by 76.97–112.24%. Furthermore, LPTWK10 was effective in reducing erythema and inflammation while enhancing skin lightness. Histological assessments revealed substantial reductions in epidermal hyperplasia and collagen degradation. Additionally, LPTWK10 was found to influence critical mechanisms associated with collagen metabolism and proinflammatory cytokine production. In summary, LPTWK10 attenuates photoaging through modulation of collagen metabolism and reduction in inflammatory responses, suggesting its potential as a functional ingredient for delaying photoaging.