OUP-186 is a high affinity and human rat species-selective antagonist of histamine H3 receptor. OUP-186 suppressed the proliferation of breast cancer cells. The IC50 values at 48 hours for OUP-186 was approximately 50 μM. OUP-186 potently induced cell dea
H4R antagonist 1 is a highly selective histamine H4 receptor (H4R) antagonist (IC50: 27 nM). H4R antagonist 1 does not show any noticeable binding affinity to other subtypes of histamine receptors, H1R, H2R, and H3R.
H3R antagonist 2 (Compound 23) is a multitarget histamine H3 receptor antagonist. It exhibits inhibitory effects on acetylcholinesterase, butyrylcholinesterase, and human monoamine oxidase B (hMAO B) with IC50 values of 180 nM, 880 nM, and 775 nM, respectively. With a Ki of 170 nM for hH3R, H3R antagonist 2 demonstrates favorable anti-neuropathic pain and memory-enhancing effects. Additionally, it can cross the blood-brain barrier (BBB) [1].