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

Abstract：

: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.

journal_name

Acta Pharmacol Sin

journal_title

Acta pharmacologica Sinica

authors

Qin YY,Xu P,Wu T,Qian CQ,Fan YL,Gen DH,Zhu L,Kong WM,Yang HY,Xu F,Yang YT,Liu L,Liu XD

doi

10.1038/s41401-019-0242-8

subject

Has Abstract

pub_date

2020-02-01 00:00:00

pages

181-191

issue

2

eissn

1671-4083

issn

1745-7254

pii

10.1038/s41401-019-0242-8

journal_volume

41

pub_type

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