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[Display omitted] • HSD aggravated colitis by disturbing gut microbiota and activating NF- κ B pathway. • L. plantarum 1201 alleviated colitis through partially restoring intestinal flora. • 1201 increased serum levels of α-T and D-mannose through intestinal flora metabolism. • α-T and D-mannose alleviated colitis through modulating intestinal immune function. High-salt diet (HSD) affects the composition and function of the intestinal microbiota and cause health problems. This study confirmed that HSD aggravates dextran sulphate sodium (DSS)-induced colitis by changing the relative abundance of the gut microbiota, activating the NF-κB pathway, and up-regulating the mRNA levels of inflammatory factors. We explored the effect of L. plantarum 1201 in negating DSS-induced ulcerative colitis, which is aggravated by HSD for the first time. Results show that L. plantarum 1201 rebuilt the balance of intestinal flora by decreasing the ratio of Firmicutes/Bacteroidetes and increasing the relative abundance of Bifidobacterium , Lactobacillus and butyric-producing bacteria. Moreover, L. plantarum 1201 inhibited the up-regulation of inflammatory cytokines (e.g., IL-1β, TNF-α, IL-6, IL-22, and IFN-γ) mRNA levels, increased colonic tight junction protein (ZO-1, ocludin, and claudin-3) expression, and increased serum levels of beneficial metabolites, including alpha-tocopherol (α-T) and D-mannose. By reconstructing an animal model of colitis, we further discovered that α-T and D-mannose inhibited the NF-κB pathway, improved tissue injury, and decreased the expression of pro-inflammatory cytokines (e.g., IL-1β, TNF-α, and IL-6). This study proves for the first time that L. plantarum 1201 attenuates high-salt-aggravated colitis by increasing the serum concentrations of endogenic D-mannose in mice serum and inhibiting the consumption of α-T through intestinal flora. Therefore, regulating the gut microbiota is a potential treatment for high-salt-aggravated colitis. [ABSTRACT FROM AUTHOR]