TLR7-agonist-1

TLR7-agonist-1 is a potent and selective Toll-like Receptor 7 (TLR7) agonist with a LEC of 0.4 uM.

TLR7-agonist-1 is a potent and selective Toll-like Receptor 7 (TLR7) agonist with a lowest effective concentration (LEC) of 0.4 uM in HEK293 cell. TLR7-agonist-1 is found to be selective for TLR7 over TLR8 with LEC of >100 uM for human TLR8. TLR7-agonist-1 demonstrates low inhibition across five CYP450 isozymes (IC50 >10 uM) and is also not a time dependent inhibitor of CYP450 3A4. TLR7-agonist-1 has limited inhibition of the hERG potassium ion channel 3H-dofetilide binding in vitro (IC50 >50 uM)[1].

TLR7-agonist-1 is found to be rapidly cleared in conjunction with our target profile. Both Cmax and AUC increase less than dose proportionally between 0.3 and 3 mg/kg and more than dose-proportionally between 3 and 10 mg/kg. TLR7-agonist-1 can induce an antiviral interferon stimulated gene (ISG) response without inducing an IFNα response at a low dose. TLR7-agonist-1 also induces a 2.7 log decrease in serum HBV viral load from 0.3 mg/kg, and a maximum 3.1 log decrease is observed for doses between 1 and 5 mg/kg[1].

References:
[1]. McGowan DC, et al. Identification and Optimization of Pyrrolo[3,2-d]pyrimidine Toll-like Receptor 7 (TLR7) Selective Agonists for the Treatment of Hepatitis B. J Med Chem. 2017 Jul 27;60(14):6137-6151.