In Vitro: MY-5445 inhibits human platelet aggregation by increasing cyclic GMP content and that it provides a useful probe for elucidating the role of cyclic GMP in platelet aggregation . MY-5445 selectively reverses ABCG2-mediated multidrug resistance in ABCG2-overexpressing cells. MY-5445 reverses ABCG2-mediated multidrug resistance (MDR) by potentiating the cytotoxicity of an ABCG2 substrate drug in ABCG2-overexpressing multidrug-resistant cancer cells, possibly by modulating the function and/or the protein expression of ABCG2. MY-5445 (3 μM; 48 hours) substantially increases the topotecan-induced apoptosis in S1-M1-80 cell.
In Vivo: MY-5445 (0.5-3 mg/kg; i.p.; twice a day; for 15 days) produces a significant relief of mechanical hypersensitivity.