生物活性
MS402 is a novel BD1-selective BET BrD inhibitor, inhibiting primarily Th17 cell differentiation with a little or almost no effect on Th1 or Th2 and Treg cells. MS402 has Ki values of 77 nM, 718 nM, 110 nM, 200 nM, 83 nM, and 240 nM for BRD4(BD1), BRD4(BD2), BRD3(BD1), BRD3(BD2), BRD2(BD1) and BRD2(BD2), respectively. MS402 preferentially renders Brd4 binding to Th17 signature gene loci over those of housekeeping genes and reduces Brd4 recruitment of p-TEFb to phosphorylate and activate RNA polymerase II for transcription elongation. MS402 prevents and ameliorates T-cell transfer-induced colitis in mice by blocking Th17 cell overdevelopment.
化学数据
| 分子量 | 370.83 |
| 分子式 | C20H19ClN2O3 |
| CAS号 | 1672684-68-2 |
| 纯度 | >98.5% |
| 溶解性（25°C） | DMSO ≥ 90 mg/mL |
| 储存和运输条件 | 固体粉末： -20°C 冷藏长期储存
常温运输及临时存放 |
实验操作 来自于公开的文献，仅供相同实验参考（如实验材料、目的不同，请参考其他文献）
| 细胞实验 |
|---|
| 细胞系 | murine primary naive CD4+ T cells |
| 方法 | To study the role of BET proteins in Th cell differentiation we isolated murine primary naive CD4+ T cells from mouse spleen and lymph nodes and treated them with IL-12, IL-4 plus α-IL-12, TGF-β plus IL-6, or TGF-β plus IL-2, respectively, to promote Th1, Th2, Th17, or Treg linage-specific differentiation over 3.5 d with or without MS402 added daily to cell culture (Fig. 2A). Strikingly, as shown by flow cytometry analysis, MS402, in a dose-dependent manner, inhibited IL-17 release from 18.6 to 8.0% in the Th17 polarizing condition and to a lesser extent IFN-γ production from 49.7 to 38.6% in the Th1 condition; it had little, if any, effect on IL-4 and Foxp3 expression during Th2 and Treg cell differentiation, respectively (Fig. 2B). MS402 did not affect T-cell proliferation as assessed in a carboxy-fluorescein succinimidyl ester dilution assay (Fig. S2A). |
| 浓度 | 100 nM or 500 nM |
| 处理时间 | 3.5 d |
| 动物实验 |
|---|
| 动物模型 | Rag1–/– mice |
| 配制 | - |
| 剂量 | 10 mg/kg |
| 给药处理 | i.p. injections twice a week for 3 wk |
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）
| 小鼠 | 大鼠 | 兔 | 豚鼠 | 仓鼠 | 狗 |
| 重量 (kg) | 0.02 | 0.15 | 1.8 | 0.4 | 0.08 | 10 |
| 体表面积 (m2) | 0.007 | 0.025 | 0.15 | 0.05 | 0.02 | 0.5 |
| Km系数 | 3 | 6 | 12 | 8 | 5 | 20 |
| 动物 A (mg/kg) = 动物 B (mg/kg) × | 动物 B的Km系数 |
| 动物 A的Km系数 |
例如，依据体表面积折算法，将化合物用于小鼠的剂量20 mg/kg 换算成大鼠的剂量，需要将20 mg/kg 乘以小鼠的Km系数（3），再除以大鼠的Km系数（6），得到化合物用于大鼠的等效剂量为10 mg/kg。
储备液配制
以下数据基于产品分子量，对于特殊产品，请参照COA中的储备液配制条件和说明进行操作。
| Concentration / Solvent Volume / Mass | 1 mg | 5 mg | 10 mg |
|---|
| 1 mM | 2.6967 mL | 13.4833 mL | 26.9665 mL |
| 5 mM | 0.5393 mL | 2.6967 mL | 5.3933 mL |
| 10 mM | 0.2697 mL | 1.3483 mL | 2.6967 mL |
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