Effect of T1R3 Taste Receptor Gene Deletion on Dextran Sulfate Sodium-Induced Colitis in Mice

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  • KONDO Tsubasa
    Department of Preventive Environment and Nutrition, Institute of Biomedical Sciences, Tokushima University Graduate School
  • UEBANSO Takashi
    Department of Preventive Environment and Nutrition, Institute of Biomedical Sciences, Tokushima University Graduate School
  • ARAO Natsuki
    Department of Preventive Environment and Nutrition, Institute of Biomedical Sciences, Tokushima University Graduate School
  • SHIMOHATA Takaaki
    Department of Preventive Environment and Nutrition, Institute of Biomedical Sciences, Tokushima University Graduate School Faculty of Marine Biosciences, Fukui Prefectural University
  • MAWATARI Kazuaki
    Department of Preventive Environment and Nutrition, Institute of Biomedical Sciences, Tokushima University Graduate School
  • TAKAHASHI Akira
    Department of Preventive Environment and Nutrition, Institute of Biomedical Sciences, Tokushima University Graduate School

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<p>Taste receptor type 1 member 3 (T1R3) recognize umami or sweet tastes and also contributes type 2 immunity and autophagy in small intestine and muscle cells, respectively. Since imbalance of type 1 and type 2 immunity and autophagy affect intestinal bowel disease (IBD), we hypothesized that T1R3 have a potential role in the incidence and progression of colitis. In the present study, we investigated whether genetic deletion of T1R3 impacted aggravation of DSS-induced colitis in mice. We found that T1R3-KO mice showed reduction in colon damage, including reduced inflammation and colon shrinking relative to those of WT mice following DSS treatment. mRNA expression of tight junction components, particularly claudin1 was significantly lower in T1R3-KO mice with trend to lower inflammation related gene mRNA expression in colon. Other parameters, such as response to microbial stimuli in splenic lymphocytes and peritoneal macrophages, gut microbiota composition, and expression of autophagy-related proteins, were similar between WT and KO mice. Together, these results indicated that deletion of T1R3 has a minor role in intestinal inflammation induced by DSS-induced acute colitis in mice.</p>

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