生物活性

• 描述SKA-31 is a potent potassium channel activator with EC50s of 260 nM, 1.9 μM, 2.9 μM, and 2.9 μM for KCa3.1, KCa2.2, KCa2.1 and KCa2.3, respectively. SKA-31 potentiates endothelium-derived hyperpolarizing factor response and lowers blood pressure. SKA-31 activates KCa2/3 channels more potently than PK 26124, and is more selective over other ion channels. SKA-31 potentiates native KCa3.1 and KCa2.3 in murine carotid endothelium with EC50 values of 225 nM and 1.6 μM for KCa3.1 and KCa2.3, respectively. Administration of 10 and 30 mg/kg SKA-31 lowered mean arterial blood pressure by 4 and 6 mm Hg in normotensive mice and by 12 mm Hg in angiotensin-II-induced hypertension. SKA-31 stimulates KCa3.1 and KCa2.3 in vascular endothelial cells and increases acetylcholine-induced endothelium-derived hyperpolarizing factor (EDHF) -mediated vasodilation^[1]. SKA-31 reduces cell viability with IC50s of 5.3 μM , 46.9 μM in HCT-116 cells and HCT-8 cells, respectively. SKA-31 triggers apoptosis in HCT-116 cells at 5 μM, and the effect is smaller in HCT-8 cells at 45 μM. SKA-31 increases the percentage of cells in G0/G1 phase in HCT-116 and HCT-8 cell lines at 5 μM and 45 μM, respectively. SKA-31 further activates Caspase 3 and reduces Akt phosphorylation induced by CDDP^[2].