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• W2802425644 abstract "Objective The blood–brain barrier (BBB), regulating brain homeostasis and limiting the entry of most drugs, is characterized by intercellular tight junctions and the presence of transporters. In this study, the paracellular tightness and functional expression of efflux transporters P-glycoprotein (P-gp) and breast cancer resistance protein (BCRP) were evaluated in mouse brain immortalized cell line bEnd3 to prove it as a useful BBB-mimicking system for biological and pharmacological research.Methods The presence of P-gp, BCRP and tight junction proteins occludin, claudin-5 and ZO-1 were validated by RT-PCR and Western blot. The tightness of bEnd3 monolayers was evaluated by measuring the permeability of hydrophilic marker Lucifer yellow. The P-gp functionality was identified by intracellular uptake assay using Rhodamine 123 (R123) as P-gp substrate and verapamil as P-gp inhibitor. The BCRP functionality was identified by flow cytometric analysis of mitoxantrone accumulation and fluorescence microscopic analysis of Hoechst 33342 accumulation using Ko-143 as BCRP inhibitor.Results The bEnd3 cells demonstrated the expression of P-gp, BCRP and tight junction proteins occludin, claudin-5 and ZO-1 at mRNA and protein levels. The permeability coefficient of Lucifer yellow was 1.3 ± 0.13 × 10−3 cm/min, indicating the moderate paracellular tightness barrier formed by bEnd3 cells. The verapamil induced a higher cellular uptake of Rhodamine 123, and Ko-143 significantly elevated cellular accumulation of mitoxantrone and Hoechst 33342, suggesting the P-gp and BCRP functionality shown by bEnd3 cells.Conclusions The bEnd3 cell line represents a useful in vitro tool for studying BBB characteristics and drug transport mechanisms at the BBB." @default.
• W2802425644 created "2018-05-17" @default.
• W2802425644 creator A5032269876 @default.
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• W2802425644 date "2018-04-23" @default.
• W2802425644 modified "2023-09-24" @default.
• W2802425644 title "Paracellular tightness and the functional expression of efflux transporters P-gp and BCRP in bEnd3 cells" @default.
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• W2802425644 doi "https://doi.org/10.1080/01616412.2018.1460701" @default.
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