Colonocyte energy metabolism via short-chain fatty acid production

Colonocyte energy metabolism via short-chain fatty acid (SCFA) production describes the physiological process where colonic epithelial cells derive approximately 60-70% of their energy from the oxidation of fermentation products. Unlike most tissues that prefer glucose, colonocytes utilize butyrate, acetate, and propionate—produced by gut microbiota from dietary fibers—as their primary fuel source (Roediger, 1980; Hamer et al., 2008). This metabolic pathway is essential for maintaining the intestinal mucosal barrier and overall gut health. In diseases like ulcerative colitis, a 'metabolic starvation' occurs where colonocytes fail to effectively oxidize SCFAs, leading to mucosal inflammation and injury (Thibault et al., 2010). Furthermore, SCFAs function as signaling molecules by activating specific G protein-coupled receptors (GPR41, GPR43, GPR109A) and inhibiting histone deacetylases, thereby influencing immune responses and suppressing oncogenesis in colorectal cancer (Ganapathy et al., 2013; Tan et al., 2014). Therapeutic strategies targeting this process include the use of prebiotics, probiotics, and direct SCFA supplementation to restore metabolic homeostasis and reduce inflammation.

Other names

Butyrate metabolismColonic SCFA oxidationColonocyte energy homeostasisMicrobial fermentation energy utilization

Short-chain fatty acids (SCFAs) serve as the primary respiratory fuel for colonocytes, undergoing mitochondrial beta-oxidation to generate ATP; they also act as ligands for G protein-coupled receptors (FFAR2, FFAR3, HCAR2) and inhibit histone deacetylases (HDACs) to modulate gene expression and inflammatory signaling.