Diphenyleneiodonium chloride (DPI) is an agonist of GPR3 with EC50 value of 1μM [1]. Also, diphenyleneiodonium chloride inhibits NADH oxidase (NOX), NO synthase and cytochrome P450 reductase [2] [3] [4].

G protein-coupled receptor 3 (GPR3) is an orphan G protein-coupled receptor (GPCR) with constitutive G(s) signaling activity that activates cyclic AMP and is mainly expressed in mammalian brain and oocytes [1].

DPI is a GPR3 agonist. In HEK293 cells stably expressed GPR3, DPI increased the level of intracellular cAMP, which was independent of NOX inhibition. DPI activated adenylate cyclase in cells expressing GPR3. In HeLa cells coexpressed β-arrestin2 and GPR3, DPI increased Ca2+ mobilization, GPR3 receptor desensitization and membrane localization of β-arrestin2 [1]. In HeLa cells, DPI inhibited NADPH oxidation by NOX with EC50 value of 0.1 μM [2]. In mouse macrophages, DPI irreversibly and completely inhibited NO synthase, which was blocked by NADP+, NADPH or 2’ 5’ -ADP. Also, DPI inhibited acetylcholine-induced relaxation of norepinephrine-preconstricted rabbit aortic rings with IC50 value of 300 nM [3]. DPI irreversibly inhibited NADPH cytochrome P450 oxidoreductase with Ki value of 2.8 μM [4].

In rats, DPI (10-5 mol/kg) inhibited the depressor response to acetylcholine [5].

References:
[1].  Ye C, Zhang Z, Wang Z, et al. Identification of a novel small-molecule agonist for human G protein-coupled receptor 3. J Pharmacol Exp Ther, 2014, 349(3): 437-443.
[2].  Morré DJ. Preferential inhibition of the plasma membrane NADH oxidase (NOX) activity by diphenyleneiodonium chloride with NADPH as donor. Antioxid Redox Signal, 2002, 4(1): 207-212.
[3].  Stuehr DJ, Fasehun OA, Kwon NS, et al. Inhibition of macrophage and endothelial cell nitric oxide synthase by diphenyleneiodonium and its analogs. FASEB J, 1991, 5(1): 98-103.
[4].  Tew DG. Inhibition of cytochrome P450 reductase by the diphenyliodonium cation. Kinetic analysis and covalent modifications. Biochemistry, 1993, 32(38): 10209-10215.
[5].  Wang YX, Poon CI, Poon KS, et al. Inhibitory actions of diphenyleneiodonium on endothelium-dependent vasodilatations in vitro and in vivo. Br J Pharmacol, 1993, 110(3): 1232-1238.