Type 2 diabetes mellitus (T2DM) is the most prevalent metabolic disorder. Gardenia jasminoides Ellis is a traditional herbal medicine used in metabolic disease treatment; however, the effects of Gardenia jasminoides Ellis polysaccharides (GPS) on T2DM remain unknown. This study aimed to investigate the antidiabetic effect of GPS in a T2DM mouse model induced by high-fat diet (HFD) and streptozotocin administration, and to elucidate the potential molecular mechanism. Treatment with low and high doses (200 and 400 mg/kg) of GPS significantly reduced the fasting blood glucose level of T2DM mice by 44.8 % and 33.0 %, respectively. In T2DM mice, oral glucose tolerance test outcomes and insulin tolerance were significantly improved by GPS intervention (p < 0.05), and the pancreatic tissue damage was ameliorated compared with control mice. Moreover, GPS intervention upregulated the liver expression of peroxisome proliferator-activated receptor gamma (PPARγ) by 1.7 fold, improved insulin resistance, and increased glycogen synthesis in T2DM mice compared with in untreated control mice (p < 0.05). More importantly, GPS intervention significantly improved gut microbiota dysbiosis, increased the abundance of short chain fatty acids producing Lactobacillus and Dubosiella by 6.6- and 16.5-fold, respectively, and elevated the serum level of butyric acid in T2DM mice. Furthermore, in vitro experiments confirmed that butyric acid can induce PPARγ expression. In conclusion, these findings suggest that GPS may alleviate T2DM by reshaping the gut microbiota and regulating intestinal metabolites. Therefore, GPS may be a potential prebiotic for modulating T2DM-associated metabolic disorders.
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