Dose-response assessment of tariquidar and elacridar and regional quantification of P-glycoprotein inhibition at the rat blood-brain barrier using (R)-[(11)C]verapamil PET.
Dose-response assessment of tariquidar and elacridar and regional quantification of P-glycoprotein inhibition at the rat blood-brain barrier using (R)-[(11)C]verapamil PET.
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DOI:
10.1007/s00259-009-1332-5
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发表时间:
2010-05
影响因子:
9.1
通讯作者:
Langer, Oliver
中科院分区:
文献类型:
--
作者:
Kuntner, Claudia;Bankstahl, Jens P.;Bankstahl, Marion;Stanek, Johann;Wanek, Thomas;Stundner, Gloria;Karch, Rudolf;Brauner, Rebecca;Meier, Martin;Ding, Xiaoqi;Mueller, Markus;Loescher, Wolfgang;Langer, Oliver
关键词:
Overactivity of the multidrug efflux transporter P-glycoprotein (P-gp) at the blood-brain barrier (BBB) is believed to play an important role in resistance to central nervous system drug treatment. (R)-[11C]verapamil (VPM) PET can be used to measure the function of P-gp at the BBB, but low brain uptake of VPM hampers the mapping of regional differences in cerebral P-gp function and expression. The aim of this study was to evaluate the dose-response relationship of two potent P-gp inhibitors and to investigate if increased brain uptake of VPM mediated by P-gp inhibition can be used to assess regional differences in P-gp activity. Two groups of Sprague-Dawley rats (n=12) underwent single VPM PET scans at 120 min after administration of different doses of the P-gp inhibitors tariquidar and elacridar. In an additional 6 rats, paired VPM PET scans were performed before and after administration of 3 mg/kg tariquidar. Inhibitor administration resulted in an up to 11-fold increase in VPM brain distribution volumes (DV) with ED50 values of 3.0±0.2 and 1.2±0.1 mg/kg for tariquidar and elacridar, respectively. In paired PET scans, 3 mg/kg tariquidar resulted in regionally different enhancement of brain activity distribution, with lowest DV in cerebellum and highest DV in thalamus. Our data show that tariquidar and elacridar are able to increase VPM brain distribution in rat brain up to 11-fold over baseline at maximum effective doses, with elacridar being about 3 times more potent than tariquidar. Regional differences in tariquidar-induced modulation of VPM brain uptake point to regional differences in cerebral P-gp function and expression in rat brain.
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影响因子:
5.7
作者:
Bart, J;Willemsen, ATM;Hendrikse, NH
通讯作者:
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影响因子:
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作者:
Lubberink, Mark;Luurtsema, Gert;Lammertsma, Adriaan A.
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Lammertsma, Adriaan A.
DOI:
10.1124/jpet.105.099648
发表时间:
2006-06-01
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DOI:
10.1124/jpet.105.088328
发表时间:
2006-02-01
影响因子:
3.5
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通讯作者:
Suhara, T
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作者:
Cutler, Leanne;Howes, Colin;Jeffrey, Phil
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Jeffrey, Phil