反式曲马多及氧去甲基曲马多对映体跨血脑屏障转运

目的　研究反式曲马多(trans T)及其活性代谢物氧去甲基曲马多(M₁)对映体的跨血脑屏障转运。方法大鼠ip盐酸 trans T (16.7mg·kg^-1 或5.0mg·kg^-1) 1 h后取血、脑脊液和大脑皮层,高效毛细管电泳测定血清、脑脊液和大脑皮层中 trans T和M₁ 对映体的浓度。结果　trans T和M₁ 各对映体浓度以大脑皮层中最高,血清中浓度居中,脑脊液中浓度最低。在血清中,(+)-trans T的浓度明显高于(-)-trans T的浓度,M₁ 两对映体的浓度无明显区别;在脑脊液和大脑皮层中,(+)-trans T的浓度明显高于(-)-trans T的浓度,(+)-M₁ 的浓度明显低于(-)-M₁ 的浓度。结论　trans T和M₁ 的跨血脑屏障转运具有立体选择性,脑组织中分别以(+)-对映体和(-)-对映体浓度较高。

TRANSPORTATION OF THE ENANTIOMERS OF TRANS TRAMADOL AND O-DEMETHYLTRAMADOL ACROSS BLOOD-BRAIN BARRIER

AIM: To investigate the transportation of the enantiomers of trans tramadol (trans T) and its active metabolite, O-demethyltramadol (M1) across blood-brain barrier. METHODS: Rats were sacrificed by femoral artery bleeding 1 h after i.p. administration of trans T hydrochloride, 16.7 mg.kg-1 or 50.0 mg.kg-1. Blood, cerebrospinal fluid and cerebral cortex were taken out. The enantiomers of trans T and M1 were analyzed by high performance capillary electrophoresis (HPCE). RESULTS: Among the three tissues, the concentration of each enantiomer of trans T and M1 was the highest in the cerebral cortex, and the lowest in the cerebrospinal fluid. In the serum, the concentration of (+)-trans T was higher than that of (-)-trans T, and the concentrations of the enantiomers of M1 were similar. In the cerebrospinal fluid and cerebral cortex, the concentration of (+)-trans T was higher than that of (-)-trans T, and the concentrations of (+)-M1 was lower than that of (-)-M1. CONCLUSION: The transportation across blood-brain barrier of the enantiomers of trans T and M1 was stereoselective. In the brain tissues, the concentrations of (+)-trans T and (-)-M1 were higher than those of their enantiomers.