DNMT1 and colitis: Activates Aryl hydrocarbon receptor (AhR), promoting expression of miR-302, downregulating expression of DNA methyltransferase 1 (DNMT-1), reducing methylation level of Foxp3 promoter region, facilitating combination of CREB and promoter region of Foxp3, and upregulating the expression of Foxp3. Alpinetin ameliorates colitis in mice by recovering Th17/Treg balance.