论文部分内容阅读
吡喹酮（ＰＱＴ）对映异构体在未诱导大鼠肝微粒体内仅（－）ＰＱＴ生成一个主要代谢产物－ＲｉｎｇＤ－ＯＨ，而在β－萘黄酮（β－ＮＦ）诱导的大鼠肝微粒体内两者均生成ＲｉｎｇＤ－ＯＨ．（＋）ＰＱＴ在苯巴比妥（ＰＢ）诱导的肝微粒体内可生成三个主要代谢物，即ＲｉｎｇＤ－ＯＨ，ＲｉｎｇＢ－ＯＨ和ＲｉｎｇＡ－ＯＨ，而（－）ＰＱＴ仅生成ＲｉｎｇＤ－ＯＨ和ＲｉｎｇＡ－ＯＨ．在地塞米松（ＤＥＸ）诱导的大鼠肝微粒体内，ＰＱＴ对映异构体代谢后生成四个主要产物，除ＲｉｎｇＤ－ＯＨ，ＲｉｎｇＢ－ＯＨ和ＲｉｎｇＡ－ＯＨ外，尚有ＲｉｎｇＤ，Ｂ－２ＯＨ．ＰＱＴ对映异构体无论在β－ＮＦ，ＰＢ或ＤＥＸ诱导的肝微粒体内，ＲｉｎｇＤ－ＯＨ的生成速率均为（－）ＰＱＴ大于（＋）ＰＱＴ，ＲｉｎｇＢ－ＯＨ和ＲｉｎｇＡ－ＯＨ的生成均为（＋）ＰＱＴ较（－）ＰＱＴ优先被羟化．本实验结果表明，β－ＮＦ，ＰＢ和ＤＥＸ所诱导的ＣＹＰ１Ａ，ＣＹＰ２Ｂ和ＣＹＰ３Ａ及未诱导Ｐ４５０代谢ＰＱＴ对映异构体表现出完全的或部分的立体选择性．
The PQT enantiomer produced only one (-) PQT-only major metabolite, RdD-OH, in uninduced rat liver microsomes, whereas in the β-naphthoflavone (β-NF) RingD-OH is formed in both microsomes. (+) PQT generated three main metabolites, RingD-OH, RingB-OH and RingA-OH, in phenobarbital-induced liver microsomes while (-) PQT produced only RingD-OH and RingA -OH. In dexamethasone (DEX) -induced rat liver microsomes, PQT enantiomers were metabolized to produce four major products, in addition to RingD-OH, RingB-OH and RingA-OH, there RingD, B-2OH . The formation rate of RingD-OH was (-) PQT was greater than (+) PQT and the formation of RingB-OH and RingA-OH were both in the PQT enantiomer in either β-NF, PB or DEX-induced liver microsomes (+) PQT is (-) PQT preferentially hydroxylated. The results of this experiment show that β-NF, PB and DEX-induced CYP1A, CYP2B and CYP3A and un-induced P450 metabolic PQT enantiomers showed complete or partial stereoselectivity.