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Xie, L.Y.; Xu, Y.B.; Ding, X.Q.; Liang, S.; Li, D.L.; Fu, A.K.; Zhan, X.A.
Biomedicine & pharmacotherapy, November 2023, 2023-11-00, 20231101, 2023-11-01, Letnik: 167Journal Article
Itaconic acid (IA), a metabolite generated by the tricarboxylic acid (TCA) cycle in eukaryotic immune cells, and its derivative dimethyl itaconate (DI) exert antibacterial functions in intracellular environments. Previous studies suggested that IA and DI only inhibit bacterial growth in carbon-limited environments; however, whether IA and DI maintain antibacterial activity in carbon-enriched environments remains unknown. Here, IA and DI inhibited the bacteria with minimum inhibitory concentrations of 24.02 mM and 39.52 mM, respectively, in a carbon-enriched environment. The reduced bacterial pathogenicity was reflected in cell membrane integrity, motility, biofilm formation, AI-2/luxS, and virulence. Mechanistically, succinate dehydrogenase (SDH) activity and fumaric acid levels decreased in the IA and DI treatments, while isocitrate lyase (ICL) activity was upregulated. Inhibited TCA circulation was also observed through untargeted metabolomics. In addition, energy-related aspartate metabolism and lysine degradation were suppressed. In summary, these results indicated that IA and DI reduced bacterial pathogenicity while exerting antibacterial functions by inhibiting TCA circulation. This study enriches knowledge on the inhibition of bacteria by IA and DI in a carbon-mixed environment, suggesting an alternative method for treating bacterial infections by immune metabolites. Display omitted •Itaconic acid (IA) and dimethyl itaconate (DI) exerted antibacterial effects in the carbon-enriched environment.•IA and DI reduced the bacterial pathogenicity including biofilm formation, motility, virulence, and AI-2/luxS system.•IA and DI inhibited succinate dehydrogenase (SDH) activity, further altering tricarboxylic acid (TCA) circulation.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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