IL17A and colitis: SCFAs bind to G-protein-coupled receptor 43 (GPR43, also known as FFAR2) and inhibit inflammatory responses during DSS-induced colitis by suppressing the differentiation of IL-17 producing cells in the lamina propria of conventional mice, suggesting that germ-free mice are more susceptible to this model of colitis due to reduced SCFA in the intestinal environment [46].