| Bioactivity | IRL 2500 is a potent Endothelin receptor antagonist. IRL 2500 shows IC50 values of 1.3 and 94 nM for ETB and ETA receptors, respectively. IRL 2500 inhibits ETB receptor-mediated blood pressure increase and renal vascular resistance in rats in vivo[1]. |
| In Vivo | IRL 2500 (intravenous injection;10 mg/kg) inhibits the initial transient decrease in mean arterial pressure (MAP) induced by the ETB-selective agonist IRL 1620 in rats, IRL 2500 also attenuates the IRL 1620-mediated increase in renal vascular resistance (RVR) in the anesthetized rat[1].IRL 2500 (intravenous injection;10 mg/kg) pre-reatment significantly reduces the initial vasodepressor response to endothelin-1 (ET-1) and IRL 1620, however, it is not alters the secondary and sustained pressor response to these agonists[2]. |
| Name | IRL 2500 |
| CAS | 169545-27-1 |
| Formula | C36H35N3O4 |
| Molar Mass | 573.68 |
| Appearance | Solid |
| Transport | Room temperature in continental US; may vary elsewhere. |
| Storage | 4°C, sealed storage, away from moisture *In solvent : -80°C, 6 months; -20°C, 1 month (sealed storage, away from moisture) |
| Reference | [1]. Balwierczak JL, et al. Characterization of a potent and selective endothelin-B receptor antagonist, IRL 2500.J Cardiovasc Pharmacol. 1995;26 Suppl 3:S393-6. [2]. Webb RL, et al. Effects of the ETB-selective antagonist IRL 2500 in conscious spontaneously hypertensive and Wistar-Kyoto rats.J Cardiovasc Pharmacol. 1995;26 Suppl 3:S389-92. |