Differential Interaction of Dantrolene, Glafenine, Nalidixic Acid, and Prazosin with Human Organic Anion Transporters 1 and 3

被引:4
|
作者
Burckhardt, Birgitta C. [1 ]
Henjakovic, Maja [1 ,2 ]
Hagos, Yohannes [1 ,3 ]
Burckhardt, Gerhard [1 ]
机构
[1] Univ Med Ctr Goettingen, Ctr Physiol & Pathophysiol, Humboldtallee 23, D-37073 Gottingen, Germany
[2] Univ Med Ctr Cologne, Dept Internal Med 1, Cologne, Germany
[3] PortaCellTec Biosci GmbH, Gottingen, Germany
来源
JOURNAL OF PHARMACOLOGY AND EXPERIMENTAL THERAPEUTICS | 2017年 / 362卷 / 03期
关键词
CATION TRANSPORTER; MULTIPLE MECHANISMS; HEALTHY-VOLUNTEERS; DRUGS; RESISTANCE; BINDING; MRP4; PHARMACOKINETICS; IDENTIFICATION; PHARMACOLOGY;
D O I
10.1124/jpet.117.241406
中图分类号
R9 [药学];
学科分类号
1007 ;
摘要
In renal proximal tubule cells, the organic anion transporters 1 and 3 (OAT1 and OAT3) in the basolateral membrane and the multidrug resistance-associated protein 4 (MRP4) in the apical membrane share substrates and co-operate in renal drug secretion. We hypothesized that recently identified MRP4 inhibitors dantrolene, glafenine, nalidixic acid, and prazosin also interact with human OAT1 and/or OAT3 stably transfected in human embryonic kidney 293 cells. These four drugs were tested as possible inhibitors of p-[H-3] aminohippurate (PAH) and [C-14] glutarate uptake by OAT1, and of [H-3]estrone-3-sulfate (ES) uptake by OAT3. In addition, we explored whether these drugs decrease the equilibrium distribution of radiolabeled PAH, glutarate, or ES, an approach intended to indirectly suggest drug/substrate exchange through OAT1 and OAT3. With OAT3, a dose-dependent inhibition of [H-3]ES uptake and a downward shift in [H-3] ES equilibrium were observed, indicating that all four drugs bind to OAT3 and may possibly be translocated. In contrast, the interaction with OAT1 was more complex. With [C-14] glutarate as substrate, all four drugs inhibited uptake but only glafenine and nalidixic acid shifted glutarate equilibrium. Using [H-3] PAH as a substrate of OAT1, nalidixic acid inhibited but dantrolene, glafenine, and prazosin stimulated uptake. Nalidixic acid decreased equilibrium content of [H-3] PAH, suggesting that itmay possibly be exchanged by OAT1. Taken together, OAT1 and OAT3 interact with the MRP4 inhibitors dantrolene, glafenine, nalidixic acid, and prazosin, indicating overlapping specificities. At OAT1, more than one binding site must be assumed to explain substrate and drug- dependent stimulation and inhibition of transport activity.
引用
收藏
页码:450 / 458
页数:9
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