Rabusertib (LY2603618) is a potent and selective inhibitor ofChk1with anIC₅₀of 7 nM.

Rabusertib (LY2603618) is a highly effective inhibitor of multiple aspects of Chk1 biology. Rabusertib (LY2603618) is tested against a panel of 51 diverse protein kinases in vitro. With an IC₅₀of 7 nM for Chk1, Rabusertib (LY2603618) is approximately 100-fold more potent against Chk1 than against any of the other protein kinases evaluated (PDK1, IC₅₀=893 nM, others >1000 nM). Rabusertib (LY2603618) effectively reduced Chk1 autophosphorylation with an EC₅₀of 430 nM. Inhibition of Chk1 by Rabusertib (LY2603618) also effectively abrogated the G₂/M DNA damage checkpoint in cells treated with DNA damaging agents. Treatment of cells with Rabusertib (LY2603618) produced a cellular phenotype similar to that reported for depletion of Chk1 by RNAi. Inhibition of intracellular Chk1 by Rabusertib (LY2603618) results in impaired DNA synthesis, elevated H2A.X phosphorylation indicative of DNA damage and premature entry into mitosis^[1]. Treatments of the SK-N-BE(2) cells with variable concentrations of Rabusertib (LY2603618) results in dose-dependent inhibition of cell growth determined by MTT assays with an IC₅₀of 10.81 μM^[1].

Mice bearing Calu-6 xenografts are treated with 150 mg/kg (IP) Gemcitabine and a single simultaneous 200 mg/kg oral dose of Rabusertib (LY2603618). 200 mg/kg of Rabusertib (LY2603618) is sufficient to inhibit 85 % of Chk1 autophosphorylation in vivo at 2 h. Rabusertib (LY2603618) effectively reduces Gemcitabine-induced phosphorylation on Tlk serine 695 as well, supporting the cited report with a selective chemical inhibitor of Chk1^[1].

436.30

Solid

C₁₈H₂₂BrN₅O₃

911222-45-2

Room temperature in continental US; may vary elsewhere.

DMSO : 31.25 mg/mL(71.63 mM;ultrasonic and warming and heat to 60℃)

请根据产品在不同溶剂中的溶解度选择合适的溶剂配制储备液；一旦配成溶液，请分装保存，避免反复冻融造成的产品失效。
储备液的保存方式和期限：-80℃, 6 months; -20℃, 1 month。-80℃ 储存时，请在 6 个月内使用，-20℃ 储存时，请在 1 个月内使用。

请根据您的实验动物和给药方式选择适当的溶解方案。以下溶解方案都请先按照In Vitro方式配制澄清的储备液，再依次添加助溶剂：

——为保证实验结果的可靠性，澄清的储备液可以根据储存条件，适当保存；体内实验的工作液，建议您现用现配，当天使用； 以下溶剂前显示的百
分比是指该溶剂在您配制终溶液中的体积占比；如在配制过程中出现沉淀、析出现象，可以通过加热和/或超声的方式助溶

• 1.

  请依序添加每种溶剂： 10% DMSO    40%PEG300   5%Tween-80   45% saline

  Solubility: ≥ 2.5 mg/mL (5.73 mM); Clear solution

  此方案可获得 ≥ 2.5 mg/mL (5.73 mM，饱和度未知) 的澄清溶液。

  以 1 mL 工作液为例，取 100 μL 25.0 mg/mL 的澄清 DMSO 储备液加到 400 μL PEG300 中，混合均匀；向上述体系中加入50 μL Tween-80，混合均匀；然后继续加入 450 μL生理盐水定容至 1 mL。

  将 0.9 g 氯化钠，完全溶解于 100 mL ddH2O 中，得到澄清透明的生理盐水溶液
• 2.

  请依序添加每种溶剂： 10% DMSO    90% (20%SBE-β-CDin saline)

  Solubility: ≥ 2.5 mg/mL (5.73 mM); Clear solution

  此方案可获得 ≥ 2.5 mg/mL (5.73 mM，饱和度未知) 的澄清溶液。

  以 1 mL 工作液为例，取 100 μL 25.0 mg/mL 的澄清 DMSO 储备液加到 900 μL20% 的 SBE-β-CD 生理盐水水溶液中，混合均匀。

  将 2 g 磺丁基醚 β-环糊精加入 5 mL 生理盐水中，再用生理盐水定容至 10 mL，完全溶解，澄清透明
• 3.

  请依序添加每种溶剂： 10% DMSO    90%corn oil

  Solubility: ≥ 2.5 mg/mL (5.73 mM); Clear solution

  此方案可获得 ≥ 2.5 mg/mL (5.73 mM，饱和度未知) 的澄清溶液，此方案不适用于实验周期在半个月以上的实验。

  以 1 mL 工作液为例，取 100 μL 25.0 mg/mL 的澄清 DMSO 储备液加到 900 μL玉米油中，混合均匀。