生物活性
Trichostatin A (TSA)是一种HDAC抑制剂，IC50为1.8 nM左右，HDAC8是HDAC家族中唯一不受TSA影响的成员。Trichostatin A 抑制八种乳腺癌细胞系，包括MCF-7, T-47D, ZR-75-1, BT-474, MDA-MB-231, MDA-MB-453, CAL 51, 和 SK-BR-3增殖，平均IC50为124.4 nM (范围为26.4-308.1 nM),作用于表达ERα的细胞系比作用于表达 ERα阴性的细胞系更有效。Trichostatin A作用于全部乳腺癌细胞系，抑制HDAC活性，平均IC50为 2.4 nM (范围为0.6-2.6 nM), 产生显著的组蛋白 H4高度乙酰化。与 Trapoxin (TPX) 和 Chlamydocin 有效抑制HDAC1 或 HDAC4而不是 HDAC6不同，Trichostatin A 抑制这些HDACs，且抑制程度相似， IC50 分别为6 nM, 38 nM, 和8.6 nM。
化学数据
| 分子量 | 302.37 |
| 分子式 | C17H22N2O3 |
| CAS号 | 58880-19-6 |
| 纯度 | 98.61% |
| 溶解性（25°C） | DMSO 23 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 | MCF-7, T-47D, ZR-75-1, BT-474, MDA-MB-231, MDA-MB-453, CAL 51, and SK-BR-3 cell lines |
| 方法 | Cell Proliferation Assay.
Stock cultures of breast cancer cell lines MCF-7, T-47D, ZR-75-1, BT-474, MDA-MB-231, MDA-MB-453, CAL 51, and SK-BR-3 (American Type Culture Collection, Rockville, MD) were grown in DMEM containing 10% (v/v) FCS, 2 mM L-glutamine, 100 units/ml penicillin, and 100 mg/ml streptomycin at 37°C in 5% CO2 humidified atmosphere. Cells were counted in a hemocytometer after detachment using 0.25% (w/v) trypsin in Dulbecco’s PBS without Ca21 or Mg21 (DPBS; Sigma-Aldrich) containing 0.02% (w/v) EDTA. Viability was determined by trypan blue exclusion. For each cell line, cells were seeded in 96-well microtiter plates at optimal densities determined in prior experiments to ensure exponential growth for the duration of the assay. After a 24-h preincubation, growth medium was replaced with experimental medium containing TSA at final concentrations ranging from 10-12 M to 10-5 M in log dilutions and 0.1% (v/v) ethanol, or growth medium containing 0.1% (v/v) ethanol as a vehicle control.
After 96 h incubation, cell proliferation was estimated using the sulforhodamine B colorimetric assay (11), and the results are expressed as the mean 6 SD for six replicates as a percentage of vehicle control (taken as 100%). |
| 浓度 | 10-12 M to 10-5 M |
| 处理时间 | 96 h |
| 动物实验 |
|---|
| 动物模型 | Inbred virgin female (Ludwig/Wistar/ Olac) rats bearing tumors induced with NMU model |
| 配制 | DMSO |
| 剂量 | 500 μg/kg TSA in50 μl DMSO twice weekly for 4 weeks |
| 给药处理 | s.c. 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 | 3.3072 mL | 16.536 mL | 33.0721 mL |
| 5 mM | 0.6614 mL | 3.3072 mL | 6.6144 mL |
| 10 mM | 0.3307 mL | 1.6536 mL | 3.3072 mL |
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