GPR4 deficiency alleviates intestinal inflammation in a mouse model of acute experimental colitis

Publication date: February 2017 Source:Biochimica et Biophysica Acta (BBA) - Molecular Basis of Disease, Volume 1863, Issue 2 Author(s): Edward J. Sanderlin, Nancy R. Leffler, Kvin Lertpiriyapong, Qi Cai, Heng Hong, Vasudevan Bakthavatchalu, James G. Fox, Joani Zary Oswald, Calvin R. Justus, Elizabeth A. Krewson, Dorcas O’Rourke, Li V. Yang GPR4 is a proton-sensing G protein-coupled receptor that can be activated by extracellular acidosis. It has recently been demonstrated that activation of GPR4 by acidosis increases the expression of numerous inflammatory and stress response genes in vascular endothelial cells (ECs) and also augments EC-leukocyte adhesion. Inhibition of GPR4 by siRNA or small molecule inhibitors reduces endothelial cell inflammation. As acidotic tissue microenvironments exist in many types of inflammatory disorders, including inflammatory bowel disease (IBD), we examined the role of GPR4 in intestinal inflammation using a dextran sulfate sodium (DSS)-induced acute colitis mouse model. We observed that GPR4 mRNA expression was increased in mouse and human IBD tissues when compared to control intestinal tissues. To determine the function of GPR4 in intestinal inflammation, wild-type and GPR4-deficient mice were treated with 3% DSS for 7days to induce acute colitis. Our results showed that the severity of colitis was decreased in GPR4-deficient DSS-treated mice in comparison to wild-type DSS-treated mice. Clinical parameters, macroscopic diseas...
Source: Biochimica et Biophysica Acta (BBA) Molecular Basis of Disease - Category: Molecular Biology Source Type: research