GSK126 (GSK2816126A) is a potent, highly selective inhibitor of EZH2 methyltransferase with an IC₅₀ of 9.9 nM^[1].

GSK126 potently inhibits both wild-type and mutant EZH2 methyltransferase activity with similar potencies (K_i=0.5-3 nM) independent of substrate used, and is competitive with S-adenosyl-methionine (SAM) and non-competitive with peptide substrates. GSK126 is highly selective against other methyltransferases and multiple other protein classes (EZH1, IC₅₀=680 nM)^[1]. Treatment of three SCLC cell lines with GSK126, induces growth inhibition. SCLC cell lines (Lu130, H209, and DMS53) are treated with 0.5, 2, and 8 μM GSK126, and growth curve is analyzed by WST-8 assay. Inhibition of cellular growth by GSK126 treatment is observed at 8 μM in all the three cell lines, while Lu130 and H209 are more sensitive to GSK126, even at lower doses^[2].

上海金畔生物科技有限公司 has not independently confirmed the accuracy of these methods. They are for reference only.

GSK126 is administered intraperitoneally at a dose volume of 0.2 mL per 20 g body weight in female beige SCID mice. GSK126 effectively inhibits the proliferation of EZH2 mutant DLBCL cell lines and markedly inhibits the growth of EZH2 mutant DLBCL xenografts in mice^[1].

上海金畔生物科技有限公司 has not independently confirmed the accuracy of these methods. They are for reference only.

526.67

C₃₁H₃₈N₆O₂

1346574-57-9

Room temperature in continental US; may vary elsewhere.

DMSO : 12.5 mg/mL (23.73 mM; Need ultrasonic)

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°C, 6 months; -20°C, 1 month。-80°C 储存时，请在 6 个月内使用，-20°C 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： 20% SBE-β-CD adjusted to pH 4-4.5 with 1 N acetic

  Solubility: 20 mg/mL (37.97 mM); Clear solution; Need ultrasonic and warming
• 2.

  请依序添加每种溶剂： 50% PEG300    50% saline

  Solubility: 10 mg/mL (18.99 mM); Suspended solution; Need ultrasonic
• 3.

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

  Solubility: ≥ 1.25 mg/mL (2.37 mM); Clear solution

  此方案可获得 ≥ 1.25 mg/mL (2.37 mM，饱和度未知) 的澄清溶液。

  以 1 mL 工作液为例，取 100 μL 12.5 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

• 4.

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

  Solubility: 1.25 mg/mL (2.37 mM); Suspended solution; Need ultrasonic

  此方案可获得 1.25 mg/mL (2.37 mM) 的均匀悬浊液，悬浊液可用于口服和腹腔注射。

  以 1 mL 工作液为例，取 100 μL 12.5 mg/mL 的澄清 DMSO 储备液加到 900 μL 20% 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
• 5.

  请依序添加每种溶剂： 10% DMSO    90% corn oil

  Solubility: ≥ 1.25 mg/mL (2.37 mM); Clear solution

  此方案可获得 ≥ 1.25 mg/mL (2.37 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 12.5 mg/mL 的澄清 DMSO 储备液加到 900 μL玉米油中，混合均匀。

• 6.

  请依序添加每种溶剂： 5% DMSO    40% PEG300    5% Tween-80    50% saline

  Solubility: ≥ 0.82 mg/mL (1.56 mM); Clear solution
• 7.

  请依序添加每种溶剂： 5% DMSO    95% (20% SBE-β-CD in saline)

  Solubility: ≥ 0.82 mg/mL (1.56 mM); Clear solution

• [1]. McCabe MT, et al. EZH2 inhibition as a therapeutic strategy for lymphoma with EZH2-activating mutations. Nature. 2012 Dec 6;492(7427):108-12.

  [2]. Sato T, et al. PRC2 overexpression and PRC2-target gene repression relating to poorer prognosis in small cell lung cancer. Sci Rep. 2013 May 29;3:1911.

The five-member PRC2 complex (Flag-EZH2, EED, SUZ12, AEBP2, RbAp48) containing either wild-type or mutant (A677G, Y641N, Y641C, Y641H, Y641S or Y641F) EZH2 is prepared. GSK126 is dissolved in DMSO and tested at concentrations of 0.6 nM to 300 nM with a final DMSO concentration of 2.5%. In contrast to wild-type EZH2 which prefers H3K27me0 as a substrate in vitro, EZH2 Y641 mutants prefer H3K27me2 and have little activity with H3K27me0 or H3K27me1. The A677G mutant is distinct from both the wild-type and Y641 mutant forms of EZH2 in that it efficiently methylates H3K27me0, H3K27me1, and H3K27me2; therefore, histone H3 peptides (residues 21-44; 10 μM final) with either K27me0 (wild type, A677G EZH2), K27me1 (A677G EZH2), or K27me2 (A677G, Y641N, Y641C, Y641H, Y641S and Y641F EZH2) are used as methyltransferase substrates. GSK126 is added to plates followed by addition of 6 nM EZH2 complex and peptide. As the potency of GSK126 is at or near the tight binding limit of an assay run at [SAM]=K_m, _IC50 values are measured at a high concentration of the competitive substrate SAM relative to its K_m (7.5 μM SAM where the SAM K_m is 0.3 μM)^[1].

上海金畔生物科技有限公司 has not independently confirmed the accuracy of these methods. They are for reference only.

JUB– and PTRF-introduced DMS53 cells are seeded at density of 1×10³ cells/well in 96-well plate, and cellular growth is analyzed using WST-8 kit at 12, 36, 60, and 84 h. Cellular growth of Lu130, H209, and DMS53 with treatment by DZNep or GSK126 is also analyzed using WST-8 kit. DZNep is dissolved in PBS at 5 mM, and cells are cultured at the final concentration of 5 μM. GSK126 is dissolved in DMSO at 10 mM, and cells are cultured at 0.5, 2, and 8 μM^[2].

上海金畔生物科技有限公司 has not independently confirmed the accuracy of these methods. They are for reference only.

Mice^[1]
GSK126 or vehicle is administered intraperitoneally at a dose volume of 0.2 mL per 20 g body weight. Pfeiffer or KARPAS-422 cells (1×10⁷) in 100% Matrigel are implanted subcutaneously in female beige SCID mice. Tumors are measured with calipers, and block randomized according to tumour size into treatment groups. For efficacy studies, 10 mice are randomized in each treatment group before the initiation of dosing and GSK126 treatment is initiated once the tumour volumes are approximately 200 mm³ in the Pfeiffer and KARPAS-422 studies and 500 mm³ in the KARPAS-422 intermittent dosing study. Mice are weighed and tumors measured with calipers twice weekly. Two-tailed t-tests are conducted assuming two samples of equal variance.

上海金畔生物科技有限公司 has not independently confirmed the accuracy of these methods. They are for reference only.

• [1]. McCabe MT, et al. EZH2 inhibition as a therapeutic strategy for lymphoma with EZH2-activating mutations. Nature. 2012 Dec 6;492(7427):108-12.

  [2]. Sato T, et al. PRC2 overexpression and PRC2-target gene repression relating to poorer prognosis in small cell lung cancer. Sci Rep. 2013 May 29;3:1911.