GPR35 is a G protein-coupled receptor that is activated by kynurenic acid and 2-acyl lysophosphatidic acids (e.g., 2-oleoyl lysophosphatidic acid). It is expressed predominantly on immune cells, the brain, and in the gastrointestinal tract. GPR35 is overexpressed in gastric cancer cells. CID-2745687 is a reversible, competitive antagonist of GPR35, blocking activation by the synthetic agonist pamoic acid with a Ki value of 12.8 nM. It less potently blocks activation of GPR35 by zaprinast (IC50 = 160 nM). It shows ~57-fold selectivity for GPR35 over the related receptor GPR55 (IC50 = 9.08 μM).
