生物活性
Tofacitinib (CP-690550,Tasocitinib)是一种新型JAK3抑制剂，IC50为1 nM，作用于JAK2和JAK1选择性低20到100倍。CP-690550 是特定的口服JAK3抑制剂, 作用于JAK2 和 JAK1,效果分别低20和100倍。CP-690550 对30种其他激酶没有作用效果，平均IC50 > 3000 nM。CP-690,550抑制IL-2诱导的增殖，比作用于GM-CSF诱导的增殖效果强30倍。
化学数据
| 分子量 | 312.37 |
| 分子式 | C16H20N6O |
| CAS号 | 477600-75-2 |
| 纯度 | 100.00% |
| 溶解性（25°C） | DMSO ≥60 mg/mL |
| 储存和运输条件 | -20°C, sealed
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 | cytokine-dependent NK92 cell line |
| 方法 | (A) After cytokine starvation for 24 hours, NK92 cells were stimulated by the addition of human IL-2 for 48 hours with and without the addition of serially increasing concentrations of tofacitinib. 3H-thymidine was added during the last 6 hours of the cultures. Cells were then harvested and analyzed for 3H-thymidine incorporation. (B) Cytokine-starved NK92 cells were stimulated with human IL-2, combined IL-6/IL- 6R, or IL-12 for 48 hours with and without serially increasing concentrations of tofacitinib. (C) The NK92 cells were treated as those in panel B with and without a single 50nM dose of tofacitinib. Data are presented as means ±SD (A-C) and are representative of 3 independent experiments. (D) After cytokine starvation for 24 hours, NK92 cells were stimulated with 30 ng/mL of IL-2, 100 ng/mL of combined IL-6/IL-6R, or 100 ng/mL of IL-12 for 1 hour with and without the addition of tofacitinib. The cell lysates were immunoblotted with an anti–phospho-STAT5 monoclonal antibody and an anti-STAT5 antibody. ss-Actin was used as an input control. Data are representative of 3 independent experiments. |
| 浓度 | 0~400 nM |
| 处理时间 | 48 h |
| 动物实验 |
|---|
| 动物模型 | IL-15–transgenic CD8 T-cell leukemia–bearing mice |
| 配制 | dissolved in polyethylene glycol 300 (PEG300; VWR Scientific Products) |
| 剂量 | 50 mg/mL |
| 给药处理 | continuously administered via a subcutaneous mini-osmotic pump (ALZET) |
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 | 3.2013 mL | 16.0067 mL | 32.0133 mL |
| 5 mM | 0.6403 mL | 3.2013 mL | 6.4027 mL |
| 10 mM | 0.3201 mL | 1.6007 mL | 3.2013 mL |
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