guinea pig 5-ht1b receptor

AR-A 2 is a selective 5-HT1B receptor antagonist with high affinity to guinea pig cortex 5-HT1B 1D and recombinant guinea pig 5-HT1B receptors (Ki: 0.24 and 0.47 nM), exhibiting a 10-fold lower affinity to guinea pig 5-HT1D receptor (Ki: 5 nM).

RO1138452 (CAY10441) is a selective and orally bioavailable antagonist of prostacyclin receptor (pKi: 8.3). It antagonizes the carbaprostacyclin-induced activation of human neuroblastoma adenylate cyclase, blocking cyclic AMP accumulation in a dose-dependent manner. Likewise, it inhibits the binding of tritiated iloprost to rodent neuroblastoma cells with a Ki of about 1.5 nM. At levels between 2-20 mg kg in rats, CAY10441 shows significant analgesic activity in standard antinociceptive assays [1].