We describe a method of preparation of high specific activity tritium-labelled leukotriene (LT) B4 from [5,6,8,9,11,12,14,15-3H] arachidonic acid (AA; 6.66 TBq/mmol) utilizing a LTB4-synthesizing enzyme system from rat basophilic leukemia (RBL-1) cells. It was shown that both cyclooxygenase inhibitor indomethacin and adenosine 5′-triphosphate induced [3H] AA transformation to [3H] LTB4. In optimized conditions up to 15% of total radioactivity of the incubation mixture was present in [3H] LTB4. A separation of [3H] LTB4 from other labelled C20:4 products was achieved by a three-step reverse phase-high-performance liquid chromatography in methanol- and acetonitrile-based solvent systems. [3H] LTB4 was confirmed to be identical to the naturally occurring LTB4 by a radioligand binding assay using a culture of HF1 cells that express a BLT1 receptor. Copyright © 2008 John Wiley & Sons, Ltd.
我们描述了一种利用大鼠嗜碱性白血病(RBL-1)细胞中的 LTB4 合成酶系统,从[5,6,8,9,11,12,14,15-3H]
花生四烯酸(
AA;6.66 TBq/mmol)制备高特异性氚标记的
白三烯(LT)B4 的方法。研究表明,环氧化酶
抑制剂吲哚美辛和
腺苷 5′-
三磷酸都能诱导[3H]
AA 转化为[3H] LTB4。在优化条件下,[3H] LTB4 的放射性占到孵育混合物总放射性的 15%。在
甲醇和
乙腈溶剂系统中,通过三步反相高效
液相色谱法将[3H] LTB4 从其他标记的 C20:4 产物中分离出来。通过使用表达 BLT1 受体的 HF1
细胞培养物进行放射性
配体结合试验,证实[3H] LTB4 与天然存在的 LTB4 相同。Copyright © 2008 John Wiley & Sons, Ltd. All Rights Reserved.