Gut Microbiota Metabolism and Inflammation

The gut microbiota comprises trillions of microorganisms whose collective metabolic activities shape host physiology and immune homeostasis. Microbial fermentation of dietary fibres yields short-chain fatty acids such as butyrate and acetate, which reinforce epithelial barrier integrity and modulate inflammatory signalling. Parallel transformations of host-derived bile acids by bacterial bile salt hydrolases influence lipid absorption and systemic metabolic pathways. A balanced microbial ecosystem prevents dysbiosis, whereas shifts in species composition or functional capacity can trigger low-grade inflammation linked to metabolic disorders, inflammatory bowel disease and colorectal cancer. Recent advances have illuminated strain-level differences in metabolite production and immune modulation, offering avenues for targeted probiotic or prebiotic interventions to restore microbial equilibrium and mitigate inflammatory disease.

Research from Nature Portfolio

Recent studies have characterised specific gut symbionts that reshape host lipid and bile acid metabolism. Strains of Turicibacter have been shown to express distinct bile salt hydrolases, leading to differential deconjugation of bile acids and consequent alterations in serum cholesterol, triglycerides and adipose tissue mass. These findings position Turicibacter as a modulator of host fat biology with potential therapeutic utility. In parallel, oral administration of Blautia wexlerae in animal models has demonstrated anti-inflammatory and anti-obesogenic effects, driven by unique amino acid and carbohydrate metabolic pathways that generate S-adenosylmethionine, lactate and succinate, while concurrently reshaping the broader gut community and ameliorating diet-induced obesity and insulin resistance.

Gut Microbiota Metabolism and Inflammation publication trend

The graph below shows the total number of articles in gut microbiota metabolism and inflammation across all publications each year (not limited to Nature Index journals).

Technical terms

Short-chain fatty acids: Fatty acids with fewer than six carbon atoms produced by microbial fermentation of dietary fibres, crucial for epithelial health and immune regulation.

Bile salt hydrolases: Microbial enzymes that deconjugate bile acids, altering their solubility and signalling properties in host lipid metabolism.

Exopolysaccharide (EPS): Extracellular polysaccharide layer produced by bacteria that can interact with host immune receptors and modulate inflammatory responses.

Enterotype: Classification of gut microbiota into distinct community configurations based on dominant bacterial families, associated with metabolic and immunological phenotypes.

Dysbiosis: Disruption of the normal microbial balance in the gut, often linked to inflammation, metabolic dysregulation and disease.

References

1. Gut microbiota Turicibacter strains differentially modify bile acids and host lipids. Nature Communications (2023).
2. Oral administration of Blautia wexlerae ameliorates obesity and type 2 diabetes via metabolic remodeling of the gut microbiota. Nature Communications (2022).
3. The human gut symbiont Ruminococcus gnavus displays strain-specific exopolysaccharides modulating the host immune response. Carbohydrate Polymers (2024).
4. The impact of gut microbiome enterotypes on ulcerative colitis: identifying key bacterial species and revealing species co-occurrence networks using machine learning. Gut Microbes (2023).