Dietary metabolites and the gut microbiota: an alternative approach to control inflammatory and autoimmune diseases

James L Richards, Yu Anne Yap, Keiran H McLeod, Charles R Mackay, Eliana Mariño, James L Richards, Yu Anne Yap, Keiran H McLeod, Charles R Mackay, Eliana Mariño

Abstract

It is now convincingly clear that diet is one of the most influential lifestyle factors contributing to the rise of inflammatory diseases and autoimmunity in both developed and developing countries. In addition, the modern 'Western diet' has changed in recent years with increased caloric intake, and changes in the relative amounts of dietary components, including lower fibre and higher levels of fat and poor quality of carbohydrates. Diet shapes large-bowel microbial ecology, and this may be highly relevant to human diseases, as changes in the gut microbiota composition are associated with many inflammatory diseases. Recent studies have demonstrated a remarkable role for diet, the gut microbiota and their metabolites-the short-chain fatty acids (SCFAs)-in the pathogenesis of several inflammatory diseases, such as asthma, arthritis, inflammatory bowel disease, colon cancer and wound-healing. This review summarizes how diet, microbiota and gut microbial metabolites (particularly SCFAs) can modulate the progression of inflammatory diseases and autoimmunity, and reveal the molecular mechanisms (metabolite-sensing G protein-coupled receptor (GPCRs) and inhibition of histone deacetylases (HDACs)). Therefore, considerable benefit could be achieved simply through the use of diet, probiotics and metabolites for the prevention and treatment of inflammatory diseases and autoimmunity.

Figures

Figure 1
Figure 1
General model of how diet may be contributing to human inflammatory diseases such as obesity, T1D, T2D and kidney and cardiovascular diseases. Diet-induced changes to gut microbiota, and reduced production of SCFAs, lead to changed signalling through GPCRs, changes to gene transcription through HDAC effects and resulting changes to gut homeostasis, Treg biology and regulation of inflammation.

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