Ilorasertib (ABT-348) (ABT-348) is an ATP-competitive multitargeted kinase inhibitor, which inhibits Aurora A/Aurora B/Aurora C (IC50s: 120 nM/7 nM/1 nM). It also suppresses RET tyrosine kinase, PDGFRβ, and Flt1 (IC50s: 7 nM, 3 nM, and 32 nM).

VEGFR2:2 nM, VEGFR1:1 nM, Aurora C:1 nM, PDGFRα:11 nM, Aurora B:7 nM, PDGFRβ:13 nM, Aurora A:120 nM, FLT3:1 nM

除了针对Aurora激酶外，Ilorasertib还是VEGFR和PDGFR激酶家族的强效抑制剂，并在较小程度上抑制Src家族的胞质酪氨酸激酶。Ilorasertib能够依赖浓度地增加两种NSCLC细胞系展现多倍体的程度和数量（EC50: 5, 10 nM）。Ilorasertib对表达BCR-ABL的CML细胞以及表达Gleevec抗性BCR-ABL T315I突变的细胞显示出抗增殖活性（IC50: 47, 260 nM）[2]。

Ilorasertib 在子宫水肿模型中有效抑制 VEGF 反应（ED50：0.2 mg/kg，静脉注射）。 Ilorasertib (25 mg/kg, s.c.) 可抑制从移植白血病模型获得的循环肿瘤细胞中的组蛋白 H3 磷酸化。 Ilorasertib（20 mg/kg，口服）可抑制人类异种移植模型中已形成肿瘤的生长并导致晚期肿瘤消退[2]。 Ilorasertib 在实体和血液异种移植模型中每周一次静脉、微型泵或肠胃外给药后显示出显着的抗肿瘤功效[3]。

Noncycling primary HUVEC are used to assess the effect of Ilorasertib on nonproliferating cells. Cells (35,000/well) are seeded in growth medium in a 96-well tissue culture plate, and after 2 days, the medium is changed and the cells are treated with Ilorasertib. After an additional 3 days, cell viability is measured with Cell TiterGlo reagent [2].

For flank xenograft models, cells are suspended in PBS, mixed with Matrigel (phenol red-free) in a ratio of 1:4 (v/v), and inoculated into the flank of female SCID/beige mice (5 million cells per site). Inoculated mice are randomized into groups of 10, and treatment is initiated when mean tumor volume is approximately 0.4 cm^3 or 0.5 cm^3. Tumor growth in the flank is assessed by measuring tumor size with calipers and calculating volume using the formula (L × W2/2). Study groups are terminated before tumor volume reaches 3 cm^3. Inhibition of tumor growth is assessed at the time the vehicle-treated group is terminated by calculating the ratio of the mean volume of the test drug group to the mean volume of the untreated (control) group (T/C) and calculating the percentage of inhibition of control [(1 ? T/C) × 100]. The dosing formulation of test agents is prepared by stepwise addition, with mixing, of the following reagents: EtOH, Tween 80, polyethylene glycol 400, and 2% hydroxypropyl methylcellulose (2:5:20:73, v/v). The dosing volume is 10 mL/kg [2].