Bile duct ligation enhances AZT CNS toxicity partly by impairing the expression and function of BCRP in rat brain  

作　　者：Yuan-yuan Qin Ping Xu Tong Wu Chao-qun Qian Yi-lin Fan Dong-hao Gen Liang Zhu Wei-min Kong Han-yu Yang Feng Xu Yi-ting Yang Li Liu Xiao-dong Liu 

机构地区：[1]Center of Drug Metabolism and Pharmacokinetics,School of Pharmacy,China Pharmaceutical University,Nanjing 210009,China

出　　处：《Acta Pharmacologica Sinica》2020年第2期181-191,共11页中国药理学报（英文版）

基　　金：the National Natural Science Foundation of China(Nos.81573490,81872930,and 81673505);the Natural Science Foundation of Jiangsu Province(BK20161457);the"Double First-Class"University Project(CPU2018GY22).

摘　　要：Breast cancer resistance protein(BCRP)is one of ATP-binding cassette(ABC)transporters in brain microvessel endothelial cells that transport their substrates from brain to blood,thus limiting substrates to crossing into brain through blood–brain barrier.Our previous works show that bile duct ligation(BDL)impairs expression and function of brain BCRP in rats.Since zidovudine(AZT)is BCRP substrate,we investigated whether impaired expression and function of BCRP increased brain distribution and toxicity of AZT in BDL-D7 rats.After administration of AZT(10 mg/kg,i.v.),BDL markedly increased brain AZT concentrations,compared with sham-operated(SO)rats.The ratio of AZT brain-to-plasma area under concentration curve(AUC)in BDL rats was increased to 1.6-folds of SO rats.After treatment with AZT(100 mg/kg every day,i.v.)for 7 days,BDL significantly impaired cognitive functions compared with SO rats,evidenced by the significantly decreased percentage of alternation in Y-maze test and prolonged escaped latency in two-way passive avoidance trial.Furthermore,AZT treatment caused significant decrease in copies of mitochondrial DNA and mitochondrial membrane potential in hippocampus of BDL rats.Moreover,AZT treatment caused a significant decrease of cortex microtubule-associated protein 2 and hippocampus synaptophysin levels in BDL rats.AZT-induced CNS adverse alterations in BDL rats were not observed in SO rats treated with AZT.In conclusion,BDL decreases the function and expression of brain BCRP in rats,leading to increased brain distribution of AZT,which in turn enhances AZT CNS toxicity,leading to mitochondrial dysfunction,neuronal damage,and ultimately cognitive dysfunction.

关 键 词：ZIDOVUDINE liver failure breast cancer resistance protein blood-brain barrier PHARMACOKINETICS drug distribution NEUROTOXICITY cognitive functions 

分 类 号：R285.5[医药卫生—中药学]