生物活性 | |||
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描述 | Three important signaling proteins, receptor-interacting protein 1 (RIP1), receptor-interacting protein 3 (RIP3), and mixed lineage kinase domain-like protein (MLKL), have been recognized as critical components in the regulated necrotic cell death pathway. RIPA-56 is a highly selective, potent, and metabolically stable RIP1 inhibitor with an IC50 of 13 nM. Notably, RIPA-56 had a half-life of 128 min in human liver microsomal stability assays and an EC50 of 28 nM in TSZ-induced HT-29 necrosis assay. It also demonstrated potency in protection of murine L929 cells from TZ-induced necrosis (EC50 = 27 nM). In C57BL/6 mice, both multiple-dose (0.1, 1, 3 mg/kg body weight (BW), IP, 17 min before mTNFα injection and once every 12 h) and single-dose (6 mg/kg BW, IP, 17 min before mTNFα injection) of RIPA-56 treatment dramatically increased the survival rate of TNFα-treated mice, showing a dose-dependent effect. Mice treated with multiple-dose of RIPA-56 (3 mg/kg) or a single 6 mg/kg dose of RIPA-56 had a survival rate of 100%, much higher than the TNFα/1 group, which had a survival rate of 60%[1]. | ||
作用机制 | An allosteric back-pocket is isolated from RIP1 ATP binding site and forms an L-shaped hydrophobic pocket. RIPA-56 fits tightly in this pocket[1]. |
实验方案 | |||
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1mg | 5mg | 10mg | |
1 mM 5 mM 10 mM |
4.52mL 0.90mL 0.45mL |
22.59mL 4.52mL 2.26mL |
45.19mL 9.04mL 4.52mL |
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