Metagenomic insights into the effects of Urtica dioica vegetable on the gut microbiota. - GreenMedInfo Summary
Metagenomic Insights into the Effects of Urtica dioica vegetable on the Gut Microbiota of C57BL/6J obese Mice, particularly the composition of Clostridia.
J Nutr Biochem. 2021 Feb 2:108594. Epub 2021 Feb 2. PMID: 33545322
Urtica dioica (UT) vegetable attenuates diet induced weight gain and insulin resistance. We hypothesized that UT imparts metabolic health by impacting the gut microbiota composition. We examined effects of UT on the cecal bacterial taxonomic signature of C57BL/6J mice fed isocaloric diets: a low-fat diet (LFD) with 10% fat, a high fat diet (HFD) with 45% fat or the HFD supplemented with 9% UT (HFUT). Among Firmicutes, the HFD had no significant impact on Clostridia, but increased Bacilli particularly genus Lactococcus and Lactobacillus. HFUT lowered Lactococcus but not Lactobacillus to levels of the LFD (P<0.01; n=9). Further examination of Clostridia showed that HFUT increased genus Clostridium by over 2-fold particularly the species C. vincentii and C. disporicum and increased genus Turicibacter by 3-fold (P<0.05; n=9). Abundance of Clostridium and Turicibacter negatively correlated with body weight (P<0.05; R=0.42) and HOMA-IR (P<0.05; R=0.45). Turicibacter and Clostridium have been shown to be more abundant in lean phenotypes compared to obese. Clostridium impacts host phenotype by inducing intestinal T cell responses. The HFUT diet had no effect on members of Actinobacteria. Among Bacteroidetes, HFUT mainly increased proliferation of Bacteroides thetaiotaomicron (P<0.05; n=9) with no significant impact on other groups. Functional analysis showed that HFUT enhanced bacterial beta-alanine and D-arginine metabolism both of which are associated with a lean phenotype and enhanced insulin sensitivity. We conclude that impacting the proliferation of Clostridium and Turicibacter and amino acid metabolism may be a contributing mechanism by which Urtica dioica impacts metabolic health.