国际生物医药联合研究院分析测试中心
药物-药物相互作用测试服务
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下一篇 2016-10-31 11:18:23
·细胞色素P450酶抑制实验(DDI):
原理:通过测试不同浓度抑制剂下P450酶亚型底物的浓度,计算该抑制剂的IC50值。
检测方法:配制一定浓度肝微粒体溶液,NADPH启动反应,37℃水浴一定时间后,终止反应,应用LC/MS/MS测试底物浓度。
例1 药物体外代谢稳定性研究
实验条件: a. pH=7.4 buffer:
b. Livermicrosome concentration: 1 mg/mL
c. NADPH stock concentration:5 mM
d. Compound concentration:1 uM
e. Time point:0 min, 2 min, 5 min, 10 min, 15 min, 30 min, 45 min, 60 min
代谢酶及底物:
CYP |
Compound |
1A2 |
Phenacetin |
2C9 |
Diclofenac Sodium Salt |
2C19 |
Omeprazole |
2D6 |
Dextromethorphan Hydrobromide |
3A4 |
Midazolam Maleate |
结 果:
|
Dextromethorphan (CYP 2D6) |
Midazolam (CYP 3A4) |
Phenacetin (CYP 1A2) |
Diclofenac (CYP 2C9) |
Omeprazole (CYP 2 C19) |
T1/2 (min) |
21.3 |
5.13 |
57.3 |
7.21 |
46.8 |
CLint (uL/min/mg protein) |
32.6 |
135.1 |
12.1 |
96.1 |
14.8 |
例2 药物-药物相互作用实验
实验条件:
l Reaction: NADPH regeneration system
l Enzyme: human liver microsome (0.2 mg/ml)
l Test compound concentration: 10 mM
l Incubation: 20 min, 37℃
l Detection method: LC-MS/MS
结果:
CYP450 Enzyme |
Substrate |
Substrate Conc.(mM) |
Marker Reaction |
Reference Inhibitior |
IC50(uM) |
1A2 |
Phenacetin |
10 |
Acetaminophen |
naphthoflavone |
0.022 |
2C9 |
Diclofenac |
10 |
4-OH-Diclofenac |
Sulfaphenazole |
0.56 |
2C19 |
Omeprazole |
0.5 |
4-OH-Omeprazole |
Tranylcypromine |
6.81 |
2D6 |
Dextromethorphan |
5 |
Dextrorphan |
Quinidine |
0.039 |
3A4 |
Testosterone |
10 |
6-b-OH-Testosterone |
Ketoconazole |
0.0104 |
ACQUITY_QPremXE
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