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首页> 外文期刊>Brain research >Disruption of mdr1a p-glycoprotein gene results in dysfunction of blood-inner ear barrier in mice.
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Disruption of mdr1a p-glycoprotein gene results in dysfunction of blood-inner ear barrier in mice.

机译:mdr1a p-糖蛋白基因的破坏导致小鼠血液内耳屏障功能障碍。

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摘要

P-glycoprotein (p-gp), a drug transporter in multidrug-resistant cancer cells, is a transmembrane protein encoded by mdr1a, mdr1b and mdr2 genes in mice. In our previous report, high level p-gp was immunohistochemically detected in capillary endothelial cells of the guinea pig inner ear, supporting a possible role as an extrusion pump in the blood-inner ear barrier (BIB). We investigated the functional involvement of p-gp in the inner ear using mdr1a gene knock-out mice [mdr1a(-/-) mice]. Pharmacokinetic analyses showed that mdr1a(-/-) mice displayed obviously increased accumulations of the p-gp-transported drugs doxorubicin (adriamycin, ADM) and vinblastine in the inner ear tissues compared with those in mdr1a(+/+) mice. Subsequent functional studies using auditory-evoked brainstem responses showed hearing impairment only in mdr1a(-/-) mice after administering these drugs. Furthermore, inhibition of p-gp function by co-administration of cyclosporin A (CsA) with doxorubicin (ADM) in mdr1a(+/+) mice resulted in increased accumulation of ADM in inner ear tissues and hearing impairment similar to that noted in mdr1a(-/-) mice. We conclude that mdr1a p-gp, which acts as an efflux pump in the inner ear, prevents ototoxicity induced by p-gp substrate drugs and contributes to a new functional mechanism in the BIB.
机译:P-糖蛋白(p-gp)是耐多药癌细胞中的一种药物转运蛋白,是小鼠中mdr1a,mdr1b和mdr2基因编码的跨膜蛋白。在我们以前的报告中,在豚鼠内耳的毛细血管内皮细胞中免疫组化检测到了高水平的p-gp,这支持了其在血内耳屏障(BIB)中作为挤出泵的作用。我们调查了使用mdr1a基因敲除小鼠[mdr1a(-/-)小鼠]的内耳中p-gp的功能参与。药代动力学分析表明,与mdr1a(+ / +)小鼠相比,mdr1a(-/-)小鼠的内耳组织中p-gp转运药物阿霉素(阿霉素,ADM)和长春碱的积累明显增加。随后的使用听觉诱发的脑干反应的功能研究表明,仅在服用了这些药物的mdr1a(-/-)小鼠中出现听力障碍。此外,在mdr1a(+ / +)小鼠中环孢菌素A(CsA)与阿霉素(ADM)共同给药对p-gp功能的抑制导致内耳组织中ADM的积累增加,并且听力障碍类似于mdr1a中所述(-/-) 老鼠。我们得出的结论是,mdr1a p-gp充当内耳的外排泵,可防止p-gp底物药物引起的耳毒性,并有助于BIB中的新功能机制。

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