生物活性

Epacadostat (INCB 024360) is a potent and selective indoleamine 2,3-dioxigenase 1 (IDO1) inhibitor with an IC50 of 71.8 nM[1]. Epacadostat can effectively reduce Trp metabolism, entailing increased activation and maturation of dendritic cells, and enhanced proliferation of effector T cells and natural killer cells (NKs), as well as attenuated Tregs expansion.

体外研究

在IFN-γ-处理的人HeLa细胞中，INCB024360有效抑制犬尿素产生。INCB024360也会促进T和自然杀伤(NK)细胞的生长，增加IFN-γ产生，并减少转化为调节性T (T(reg))-样细胞

体内研究

INCB024360 (100 mg/kg, p.o.)，通过IDO1抑制，在免疫活性小鼠中抑制kyn产生和肿瘤生长，但是在免疫缺陷小鼠中无效。 在负荷CT26结肠癌的小鼠中，INCB024360 (100 mg/kg, p.o.)通过减少犬尿素也会抑制表达IDO肿瘤的生长

激酶实验

细胞实验

Cell lines: Jurkat cells Concentrations: 50 μM Incubation Time: 72 h Method: Jurkat cells were incubated with serially diluted epacadostat for 72 h. Their viability was measured and analyzed as percentage of the non-treated control.

动物实验

Animal Models: 负荷PAN02胰腺肿瘤的雌性C57BL/6或Balb/c nu/nu小鼠 Dosages: ~100 mg/kg，一天两次 Administration: p.o.

不同实验动物依据体表面积的等效剂量转换表（数据来源于FDA指南）

例如，已知某工具药用于小鼠的剂量为88 mg/kg , 则用于大鼠的剂量换算方法：将88 mg/kg 乘以小鼠的Km系数（3），再除以大鼠的Km系数（6），得到该药物用于大鼠的等效剂量44 mg/kg。

参考文献

1.Selective inhibition of IDO1 effectively regulates mediators of antitumor immunity. Blood. 2010 Apr 29;115(17):3520-30.
2.Hydroxyamidine inhibitors of indoleamine-2,3-dioxygenase potently suppress systemic tryptophan catabolism and the growth of IDO-expressing tumors. Mol Cancer Ther. 2010 Feb;9(2):489-98.
3. LW106, a novel indoleamine 2,3-dioxygenase 1 inhibitor, suppresses tumour progression by limiting stroma-immune crosstalk and cancer stem cell enrichment in tumour micro-environment. Br J Pharmacol. 2018 Jul;175(14):3034-3049.

体内溶解度

Clinical Trial Information ( data from http://clinicaltrials.gov )

注：以上所有数据均来自公开文献，并不保证对所有实验均有效，数据仅供参考。

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