ONO-RS-082 is an inhibitor of phospholipase A (PLA). ONO-RS-082 inhibits PLA2 with the IC50 of 1.0 μM, but does not inhibit PLC even at 100 μM[2].In Vitro: ONO-RS-082 (10 μM) prevents P. aeruginosa strain PAO1-induced polymorphonumclear cells (PMNs) transepithelial migration, demonstrating that PLA2 activity is crucial to this process.In Vivo: In vivo long-term activation of KCNK3 by ONO-RS-082 (50 mg/kg/day; preventive treatment, day 0 to day 21) reduces the development of PH in the MCT-PH model.
In contrast, in vivo short-term KCNK3 activation by ONO-RS-082 (curative treatment) fails to reduce PH symptoms, which is attributed to the complete loss of KCNK3 expression in MCT-PH rats at days 14 to 21.