Species-Specific Involvement of Aldehyde Oxidase and Xanthine Oxidase in the Metabolism of the Pyrimidine-Containing mGlu<sub>5</sub>-Negative Allosteric Modulator VU0424238 (Auglurant)
作者:Rachel D. Crouch、Anna L. Blobaum、Andrew S. Felts、P. Jeffrey Conn、Craig W. Lindsley
DOI:10.1124/dmd.117.077552
日期:2017.12
Aldehyde oxidase (AO) and xanthine oxidase (XO) are molybdo-flavoenzymes that catalyze oxidation of aromatic azaheterocycles. Differences in AO activity have been reported among various species, including rats, humans, and monkeys. Herein we report a species difference in the enzymes responsible for the metabolism of the negative allosteric modulator of metabotropic glutamate receptor subtype 5 (mGlu5
醛氧化酶(AO)和黄嘌呤氧化酶(XO)是钼黄酮酶,可催化芳香氮杂杂环的氧化。据报道,包括大鼠,人类和猴子在内的各种物种之间的AO活性存在差异。本文中,我们报道了负责代谢型谷氨酸受体亚型5(mGlu5 NAM)VU0424238(VU238,增强剂)的负变构调节剂代谢的酶的物种差异。肝S9与AO和XO特异性抑制剂肼苯哒嗪和别嘌呤醇的孵育表明,大鼠和食蟹猴均通过AO介导的途径将VU238氧化为6-氧嘧啶代谢物M1,而2,6-二氧嘧啶代谢物M2的二次氧化主要被介导。通过AO在猴子中的表现和XO在大鼠中的表现。尽管酶促途径不同,物种之间M1的固有清除率(CLint)相似(食蟹猴和大鼠CLint分别为每毫克蛋白质2.00±0.040和2.19±0.201μl/ min)。在多个物种的S9中进行的抑制剂研究表明,在人类,食蟹猴和恒河猴,大鼠,小鼠,豚鼠和小型猪中,VU238氧化为M1主要是由AO介导的