| 产品描述： | 雌激素受体选择性抑制剂 | 活化剂 | 激动剂 | 拮抗剂 | 化学品 | 调节剂;Estrogen receptor Selective Inhibitors | Activators | Agonists | Antagonists | Chemicals | Modulators;;InformationH3B-5942 is a selective and irreversibleestrogen receptorcovalent antagonist, inactivates both ERα WT and ERα mutation. The Ki values are 1 nM and 0.41 nM, respectively.TargetsERα (Y537S) ; ERα WT 0.41 nM(Ki); 1 nM(Ki)In vitroH3B-5942 covalently inactivates both wild-type and mutant ERα by targeting Cys530 and enforcing a unique antagonist conformation. Upon binding to ERα, H3B-5942 triggers global DNA binding of ERα to ERE-containing promoter and enhancer regions and induces a transcriptionally repressive conformation of ERα by evicting coactivators. H3B-5942 demonstrates potent antiproliferative activity in a panel of ERαWT and ERαMUT lines with GI50 values of 0.5, 2, and 30 nmol/L in the MCF7-Parental, MCF7-LTED-ERαWT, and MCF7-LTED-ERαY537C lines, respectively. In the absence of E2, H3B-5942 shows no significant impact on ER-mediated transcription in the MCF7-Parental (endocrine therapy-sensitive) and MCF7-LTED-ERαY537C lines but does result in a 1.5-fold (P = 0.03) increase in the MCF7-LTED-ERαWT line. In the presence of E2, H3B-5942 shows a significant dose-dependent decrease in ER-mediated transactivation in all cell lines tested.In vivoH3B-5942 demonstrates significant single-agent antitumor activity in xenograft models representing ERαWT and ERαY537S breast cancer. |
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