The antioxidant activity and metabolomic analysis of the supernatant of Streptococcus alactolyticus strain FGM

作者：Xueyan Gu, Heng Wang, Lei Wang, Kang Zhang, Yuhu Tian, Xiaoya Wang, Xiaoya Wang, Guowei Xu, Zhiting Guo, Saad Ahmad, Hanyurwumutima Egide, Jianxi Li, Jianxi Li, Huub F. J. Savelkoul, Jingyan Zhang, Xuezhi Wang, Xuezhi Wang · 发表于：Scientific Reports · 年份：2024 · DOI：10.1038/s41598-024-58933-8 · 被引用次数：35 · 研究领域：Probiotics and Fermented Foods、Gut microbiota and health、Oral microbiology and periodontitis research

Strain-specific probiotics can present antioxidant activity and reduce damage caused by oxidation. Streptococcus alactolyticus strain FGM (S. alactolyticus strain FGM) isolated from the chicken cecum shows potential probiotic properties which have been previously demonstrated. However, the antioxidant properties of S. alactolyticus strain FGM remain unknown. In this view, cell-free supernatant (CFS), intact cells (IC) and intracellular extracts (CFE) of strain FGM and 3 strains of Lactobacillus (LAB) were prepared, and their scavenging capacities against DPPH, hydroxyl radicals and linoleic acid peroxidation inhibitory were compared in this study. The effects of strain FGM cell-free supernatant (FCFS) on NO production, activity of SOD and GSH-Px in RAW264.7 cells and LPS-induced RAW264.7 cells were analyzed. The metabolites in the supernatant were quantitated by N300 Quantitative Metabolome. It was shown that the physicochemical characteristics of CFS to scavenge DPPH, hydroxyl radicals, and linoleic acid peroxidation inhibitory were significantly stronger than that of IC and CFE in the strain FGM (P < 0.05), respectively 87.12% ± 1.62, 45.03% ± 1.27, 15.63% ± 1.34. FCFS had a promotional effect on RAW264.7 cells, and significantly elevated SOD and GSH-Px activities in RAW264.7 cells. 25 μL FCFS significantly promoted the proliferation of RAW264.7 cells induced by LPS, increased the activities of SOD and GSH-PX, and decreased the release of NO. Furthermore, among the differen...