Deep learning of multiplexed mitochondrial morphology identified natural compound combinations against skin photoaging.

BACKGROUND: Skin photoaging is primarily driven by mitochondrial dysfunction. Although natural products have demonstrated protective effects against Ultraviolet (UV)-induced damage, efficient screening strategies for mitochondrial-targeting compounds remain limited. Artificial Intelligence (AI)-assisted high-content screening strategy offers a valuable approach to identify bioactive candidates and elucidate their mechanisms. PURPOSE: This study aimed to employe an AI-assisted high-content screening strategy to identify mitochondrial-enhancing natural compounds that prevent skin photoaging and to evaluate their protective efficacy. METHODS: This study employed an AI-assisted high-content screening strategy to identify mitochondria-targeting compounds that mitigate photodamage. UVB-induced models were established in cells, zebrafish, and mice with UVB lamp irradiation. Mitochondrial morphology and function were quantified using JC-1, TMRM, and MitoTracker probes. Cell viability, SA-β-gal activity, and protein expression were assessed by CCK-8 assay, SA-β-gal staining, and Western blotting, respectively. RESULTS: Using AI-assisted high-content screening, we identified quercetin, spermidine, adenosine, Vitamin K2, and Mirabilis jalapa extract as mitochondrial protective compounds. Two optimized combinations, CC-1 and CC-2, restored ATP production, TCA cycle flux, and mitochondrial morphology in UVB-exposed human dermal fibroblasts (HDFs), reduced SA-β-gal activity, and upregulated COLLAGEN I, LAMIN B1, and SIRT3 expression. Both combinations alleviated the UVB-induced senescence phenotype by upregulating SIRT3. In a UVB-exposed zebrafish tail amputation model, CC-2 markedly promoted fin regeneration. These findings were validated in UVB-irradiated mice, where CC-2 demonstrated superior efficacy. CONCLUSION: Using AI-assisted high-content screening, we formulated two optimized combinations that alleviate UVB-induced skin photoaging, with CC-2 exhibiting superior efficacy, highlighting its potential as cosmetic additive.