生物活性
体外研究：Zotarolimus (ABT-578)是雷帕霉素的半合成类似物，由四唑环取代雷帕霉素42位上的天然羟基组制成。Zotarolimus能够高效抑制平滑肌细胞和内皮细胞的增殖，IC50值分别为2.9 nM和2.6 nM。Zotarolimus具有与雷帕霉素相似的结合免疫蛋白FKBP12的亲和力，也具有相当的抑制人和大鼠T细胞体外增殖的效力。Zotarolimus抑制Con A诱导的人T细胞和大鼠T细胞的增殖，IC50 分别为7.0 nM和1337 nM。
体内研究：在28天充分表征的冠状动脉再狭窄的猪模型中，Zotarolimus洗脱支架有效减少内膜增生。与金属裸支架相比，Zotarolimus似乎能够有效防止新生内膜增厚，使后期损失从1.03mm降低到0.62mm，并伴随47%的TVF减少(15.4%Driver支架到8.1%Endeavor支架)。Zotarolimus能够有效抑制佐剂DTH，EAE，和心脏移植排斥反应，ED50值分别为1.72，1.17，和3.71毫克/千克/天。
化学数据
| 分子量 | 966.21 |
| 分子式 | C52H79N5O12 |
| CAS号 | 221877-54-9 |
| 纯度 | >98% |
| 溶解性（25°C） | 100 mg/mL in 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 | Human coronary artery cells |
| 方法 | Cell proliferation is assayed by measuring tritiated thymidine incorporation in vitro. Human coronary artery cells (hCa) are seeded into tissue culture flasks for expansion and applied to 96-well plates at desired density in complete media (5000 hCaSMC; 10 000 hCaEC). After 2 days, complete media is replaced with incomplete media to synchronize cells and induce G0 state. Two days later, incomplete media are removed and replaced with complete media (serum/growth factors) to induce G0 to G1 transition. Complete media also contain drug at desired concentrations to determine its effects on cell proliferation. On day 7, 3H-thymidine is added to cells to monitor DNA synthesis, and cells are harvested after overnight incorporation of radioactivity. After an incubation period of 72 h, 25 μL (1 μCi/well) of 3H-thymidine are added to each well. The cells are incubated at 37°C for 16-18 h to allow for incorporation of 3H-thymidine into newly synthesized DNA and the cells harvested onto 96-well plates containing bonded glass fibre filters . The filter plates are air-dried overnight, MicroScint-20 (25 μL) added to each filter well and counted. Drug activity is determined by the inhibition of 3H-thymidine incorporation into newly synthesized DNA relative to cells grown in complete media. |
| 浓度 | ~1 μM |
| 处理时间 | 5 days |
| 动物实验 |
|---|
| 动物模型 | Male Sprague-Dawley rats |
| 配制 | ethanol: propylene glycol: cremophor EL: D5W vehicle (20: 30: 2: 48, by volume) |
| 剂量 | 2.5 mg/kg |
| 给药处理 | intravenous or oral |
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 | 1.035 mL | 5.1749 mL | 10.3497 mL |
| 5 mM | 0.207 mL | 1.035 mL | 2.0699 mL |
| 10 mM | 0.1035 mL | 0.5175 mL | 1.035 mL |
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