Short-Chain Fatty Acids in Inflammatory Bowel Disease

Short-chain fatty acids (SCFAs), notably acetate, propionate and butyrate, arise from microbial fermentation of dietary fibre and represent a central axis in the maintenance of colonic health. In inflammatory bowel disease (IBD), reduced diversity and abundance of SCFA-producing bacteria correlate with epithelial barrier dysfunction, aberrant immune activation and chronic inflammation. Butyrate serves as the primary energy source for colonocytes, reinforces tight junctions and modulates gene expression through histone deacetylase inhibition. Propionate and acetate engage G-protein-coupled receptors on immune cells, tempering pro-inflammatory cytokine release and guiding regulatory T-cell differentiation. Dysbiosis in IBD patients often manifests as diminished faecal SCFA levels, exacerbating mucosal damage, leukocyte infiltration and oxidative stress. Therapeutic strategies focus on restoring SCFA production via high-fibre diets, targeted bacterial consortia or direct administration of SCFAs. This integrative approach underpins global efforts to translate mechanistic insights into clinical interventions aimed at re-establishing intestinal homeostasis and improving patient quality of life.

Research from Nature Portfolio

Recent studies have illuminated a novel mechanism by which butyrate enhances mucosal defence through modulation of host-derived antimicrobial peptides. Butyrate was shown to inhibit histone deacetylases in epithelial and immune cells, leading to upregulation of multiple host defence peptides. This epigenetic regulation strengthened bacterial clearance and reduced inflammatory markers in experimental models, demonstrating a direct link between SCFA-mediated chromatin remodelling and intestinal resilience.

Short-Chain Fatty Acids in Inflammatory Bowel Disease publication trend

The graph below shows the total number of articles in short-chain fatty acids in inflammatory bowel disease across all publications each year (not limited to Nature Index journals).

Technical terms

Short-chain fatty acids (SCFAs): Carboxylic acids with fewer than six carbon atoms, produced by gut microbial fermentation of dietary fibre and acting as signalling molecules and energy sources in the colon.

Histone deacetylase (HDAC): An enzyme that removes acetyl groups from histone proteins, altering chromatin structure and gene transcription; inhibition by SCFAs influences immune and epithelial cell function.

G-protein-coupled receptors (GPCRs): A family of cell surface receptors that mediate intracellular signalling in response to extracellular ligands, including SCFAs, and regulate immune and metabolic pathways.

Ferroportin (FPN): A transmembrane protein that exports iron from cells, critical for maintaining systemic iron homeostasis and influencing inflammatory responses in the gut.

Regulatory T cells (Tregs): A subset of T lymphocytes that suppress excessive immune activation and maintain tolerance, whose differentiation is promoted by SCFA-driven epigenetic and metabolic cues.

References

1. Butyrate Prevents the Pathogenic Anemia‐Inflammation Circuit by Facilitating Macrophage Iron Export. Advanced Science (2024).
2. Enhancing recovery from gut microbiome dysbiosis and alleviating DSS-induced colitis in mice with a consortium of rare short-chain fatty acid-producing bacteria. Gut Microbes (2024).
3. Butyrate upregulates endogenous host defense peptides to enhance disease resistance in piglets via histone deacetylase inhibition. Scientific Reports (2016).