RGNCY-0080 (RU.521 cGAS inhibitor)
RU.521 is a potent and selective inhibitor of cGAS (GMP-AMP synthase) dsDNA-dependent enzymatic activity in vitro and in cells including primary macrophages taken from a Trex1 null mouse model of Aicardi-Goutieres Syndrome autoimmunity. Furthermore, the inhibition of cGAS signalling by RU.521 results in the reduction of constitutive interferon expression in the macrophages from Trex1 null mice. RU.521 is a useful tool in the understanding of cGAS and can serve as a molecular scaffold for development of autoimmune therapies. IC50=0.7μM inhibition of cGAS-dependent interferon induction in dsDNA-stimulated RAW macrophages.
Systematic Name: 3-(1-(6,7-dichloro-1H-benzo[d]imidazol-2-yl)-5-hydroxy-3-methyl-1H-pyrazol-4-yl)isobenzofuran-1(3H)-one
Mol Wt: 415.23
Tags: small molecule, autoimmune, cGAS, interferon, GMP-AMP synthase, macrophage, Trex1, RGNCY-0080