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首页> 外文期刊>Journal of pharmaceutical sciences. >A Comprehensive Study Demonstrating That P-glycoprotein Function Is Directly Affected by Changes in pH: Implications for Intestinal pH and Effects on Drug Absorption
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A Comprehensive Study Demonstrating That P-glycoprotein Function Is Directly Affected by Changes in pH: Implications for Intestinal pH and Effects on Drug Absorption

机译:证明P糖蛋白功能直接受pH值变化影响的综合研究:对肠道pH值的影响及其对药物吸收的影响

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摘要

The purpose of this study was to investigate whether changes in the pH of the gastrointestinal tract can directly affect P-glycoprotein (P-gp) function. The effect of changes in extracellular pH on P-gp functionality was examined by testing colchicine (a nonionizable P-gp substrate) in bidirectional Caco-2 and MDR1-Madine Darby canine kidney (MDCK) cell permeability assays, in which the pH of the apical and basolateral chambers was varied. Reduction of the pH from 7.4 to 5.0 and 4.5 markedly increased the apical-to-basolateral flux of colchicine and reduced the basolateral-to-apical flux. The efflux ratio for colchicine was reduced to 1.2 at pH 4.5, compared with values greater than 20 that were measured in the pH range of 5.5-7.4. A similar result was obtained when MDR1-MDCK cells were used in the bidirectional permeability studies. Other nonionizable P-gp substrates (digoxin, dexamethasone, paclitaxel, and etoposide) responded to acidic pH (4.5) in a manner similar to colchicine. Reduced P-gp ATPase activity is a reason for the diminished P-gp function observed at pH 4.5.
机译:这项研究的目的是调查胃肠道pH值的变化是否可以直接影响P-糖蛋白(P-gp)的功能。通过在双向Caco-2和MDR1-Madine Darby犬肾(MDCK)细胞渗透性测定中测试秋水仙碱(不可电离的P-gp底物)来检查细胞外pH值变化对P-gp功能的影响,其中pH为顶室和基底外侧室不同。 pH值从7.4降低到5.0和4.5显着增加了秋水仙碱的顶通量至基底外侧通量,并降低了基底外侧通量。在pH 4.5时,秋水仙碱的流出比降低至1.2,而在5.5-7.4的pH范围内测得的值大于20。当在双向渗透性研究中使用MDR1-MDCK细胞时,获得了相似的结果。其他不可电离的P-gp底物(地高辛,地塞米松,紫杉醇和依托泊苷)以类似于秋水仙碱的方式对酸性pH值(4.5)作出反应。 P-gp ATPase活性降低是在pH 4.5下观察到的P-gp功能降低的原因。

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