Aronia-derived anthocyanins and metabolites ameliorate TNFα-induced disruption of myogenic differentiation in satellite cells.

This study investigates the effects of Aronia berries, their primary anthocyanins and other second metabolites-mimicking dietary anthocyanin consumption-on enhancing muscular myogenesis under chronic inflammation. Murine muscle satellite cells (MuSCs) were cultured ex vivo, allowing for expansion and differentiation into myotubes. Myogenic differentiation was disrupted by TNFα at both early and terminal stages, with treatment using Aronia berries applied at physiologically relevant concentrations alongside TNFα. The results demonstrated that Aronia berries treatments, particularly phenolic metabolites, significantly stimulated the proliferative capacity of MuSCs. Furthermore, Aronia berries treatment enhanced early-stage myogenesis, marked by increased MymX and MyoG expression and nascent myotube formation, with metabolites showing the most pronounced effects. Aronia berry powder and individual anthocyanins exerted milder regulatory effects. Similar trends were observed during terminal differentiation, where Aronia berries treatment promoted myotube growth and inhibited TNFα-induced inflammatory atrophic ubiquitin-conjugating activity. Additionally, the secondary metabolites of Aronia berries significantly prevented muscle-specific ubiquitination in the dexamethasone-induced atrophy model. Overall, the treatment with Aronia berries enhanced myogenesis in a cellular model of chronic muscular inflammation, with Aronia-derived metabolites showing the strongest response, likely through TLR4/NF-κB modulation. In this case, enhanced regeneration capacity and anti-atrophy potential were associated with TLR4/NF-κB modulation.