生物活性
I-BET-762是一种BET (bromodomain and extra terminal domain)蛋白抑制剂， IC50约为35 nM，抑制巨噬细胞产生促炎蛋白，抑制急性炎症，对其他溴区结合域包含的蛋白具有高度的选择性。I-BET-762抑制BET(溴区和额外的末端结构域) 蛋白, BRD2, BRD3 和 BRD4, 结合到BET的串联溴区，Kd为50.5-61.3 nM, 在FRET分析中，置换BET串联溴区的一种四乙酰化的H4肽，IC50为32.5-42.5 nM。I-BET-762占据BET蛋白的乙酰基-赖氨酸结合口袋，并抑制BET蛋白结合到乙酰化的组蛋白，从而破坏了炎性基因表达必不可少的染色质复合物的形成。分化过程中的第2天使用I-BET-762处理，改变CD4+T细胞的细胞因子产生，上调一些抗炎基因产物的表达，并下调一些促炎细胞因子的表达。
化学数据
| 分子量 | 423.9 |
| 分子式 | C22H22ClN5O2 |
| CAS号 | 1260907-17-2 |
| 纯度 | >99% |
| 溶解性（25°C） | DMSO |
| 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 | isolated CD4+ T cells |
| 方法 | CD4+ T cells are isolated from lymph nodes and spleens of 10- to 12-wk-old 2D2 transgenic mice by using Invitrogen Dynal Beads according to manufacturer’s protocols. The isolated CD4+ T cells were stimulated with platebound anti-CD3 and anti-CD28 antibodies alone (ThN conditions), or in the presence of anti-IL4 and IL-12 (Th1 conditions), IL-4 and anti-IL12 (Th2 conditions), IL-1β, IL-6, and IL-23 (Th17 conditions), or TGF-β (Treg conditions). Along with the cytokine mixtures were included either the Control-768 (GSK525768A) or I-BET-762 (GSK525762A) compounds. The cells are stimulated in these condition for 60–72 h and then harvested and expanded with DMEM media containing 10% (vol/vol) FBS, antibiotics, Lglutamine, and B-2ME. The cells were counted and reset to 0.5 × 106 cells per mL on days 3 and 4 after initial stimulation. Over the course of 5 d of T-cell culture and expansion, the compounds were diluted 12-fold relative to the starting concentrations. In case of Th1, Th2, and iTreg conditions, IL-2 was added to the media at a final concentration of 20 units per mL. On day 5 after initial activation, the cells were harvested and restimulated with PMA (10 nM) and ionomycin (1 μM) for 6 h. Brefeldin A (10 μg/mL) was added during the last 2 h of stimulation. Subsequently, the cells were fixed with 4% (wt/vol) paraformaldehyde in PBS for 15 min at 25 °C, washed in PBS, and permeabilized in saponin buffer [PBS, 0.5% saponin (Sigma), 1% (wt/vol) BSA, and 0.1% (wt/vol) sodium azide]. Intracellular staining was performed as described for indicated cytokines. In some experiments, cell surface staining was completed before fixation. |
| 浓度 | 125, 250, 500nM |
| 处理时间 | 60-72h |
| 动物实验 |
|---|
| 动物模型 | LPS-induced endotoxic shock of C57BL/6 mice model |
| 配制 | 20% beta-cyclodextrin, 2% DMSO in 0.9% saline |
| 剂量 | 30 mg/kg |
| 给药处理 | retro-orbital or tail vein injection |
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 | 2.359 mL | 11.7952 mL | 23.5905 mL |
| 5 mM | 0.4718 mL | 2.359 mL | 4.7181 mL |
| 10 mM | 0.2359 mL | 1.1795 mL | 2.359 mL |
m.cnreagent.com