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. 2021 Sep 6;22(17):9641. doi: 10.3390/ijms22179641

Table 3.

Animal studies of the gut microbiota in T2D.

Reference Authors Year of Study Subjects Number Study Findings (Microbiota Changes in T2D vs. Control)
[85] Kesh et al. 2020 T2D mice vs. control (both with pancreatic adenocarcinoma +/− chemotherapy)
  • Bacteroides intestinalis and Lactobacillus murinus species were more abundant in the control group.

  • Enterobacter cloacae and Bacteroides uniformis species were specifically expressed in the T2D group.

  • Dysbiosis in the microbiota seen in animals with T2D associated with increased resistance to chemotherapy.

[86] Yin et al. 2020 T2D mice (induced by high-fat or high-sucrose-fat diet + STZ)
vs. control
  • Bacteroidetes levels were reduced in high-fat diet-fed mice vs. high sucrose.

  • Intestinal microbiota composition did not change after STZ, suggesting that the difference in metabolic phenotypes and gut microbiota was diet-related.

[87] Grasset et al. 2017 T2D obese mice (fed HFD/ high-carbohydrate diet) and T2D mice (fed HFD/carbohydrate-free diet) compared to control (on chow diet)
  • Bacteroidales, Burkholderiales, Clostridiales, and TM7 (Saccharibacteria) orders were increased in T2D vs. control.

  • Increased Porphyromonadaceae, Clostridiaceae, Peptostreptococcaceae, Burkolderiaceae, and TM7 families and reduced frequency of Lactobacillaceae in the T2D group was associated with Glucagon-like peptide 1 ( GLP-1) resistance.

  • The gut-brain axis is impaired in T2D mice, and this can prevent beta cell sensitivity to GLP-1.

  • Eubiotic microbiota required for GLP-1 sensitivity.

[88] Everard et al. 2013 ob/ob mice and HFD-fed mice, with and without prebiotics vs. lean control mice
  • The presence of Bacterium inversely correlated with body weight.

  • Akkermansia (A) muciniphila is reduced in obese mice and mice with T2D.

  • A. muciniphila administration reversed obesity-related metabolic disease, increased the levels of endocannabinoids, and controlled inflammation.