Galeterone

Galeterone (TOK-001) 是一种多功能的抗雄激素，是 CYP17 抑制剂，在去势抵抗性前列腺癌中，IC₅₀ 为 47 nM。Galeterone (TOK-001) affords strong CYP17 lyase inhibition, with IC₅₀ of 47 nM^[1]. Galeterone (TOK-001) is both a CYP17A1 inhibitor and androgen receptor antagonist and the similarity of these binding modes is likely the reason for this dual mechanism of action.This CYP17A1 binds abiraterone and Galeterone (TOK-001) with absorbance decreases at 402 nm and increases at 424 nm, consistent with nitrogen binding to the heme iron (type II interaction) with K_d of <100 nM^[2]. When LNCaP cells are cultured in medium supplemented with charcoal-stripped serum (CSS, T<1 nM) followed by treatment with increasing concentrations of Galeterone (TOK-001), the steady-state levels of AR protein are markedly decreased (up to 84%, 15 μM Galeterone (TOK-001)). In LAPC-4 cells, abiraterone alcohol reduced AR expression to a greater extent than Galeterone (TOK-001) at concentrations greater than or equal to 1 μM. When LNCaP cells are treated with 20 μM TOK-001 for 24 h, AR mRNA levels are reduced by 38%^[