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1 n U87MG cells with and without an inhibitor (tariquidar).
2 g side effects associated with high doses of tariquidar.
3 or HM30181, which is structurally related to tariquidar.
4 h concurrent infusion of the ABCB1 inhibitor tariquidar.
5 d the use of a lower, more tolerable dose of tariquidar.
6 lacidar and 3.62 +/- 0.11 muSv/MBq for (11)C-tariquidar.
7 h a 3 or 15 mg/kg dose of the P-gp inhibitor tariquidar.
8 h concurrent infusion of the ABCB1 inhibitor tariquidar.
9 essing cells treated with the P-gp inhibitor tariquidar.
10 propoxy}quinoline trihydrochloride (DCPQ) or tariquidar.
11 injection of either (11)C-elacridar or (11)C-tariquidar.
13 e in brain PET signal was observed for (11)C-tariquidar (+27% +/- 15%, P = 0.014, paired t test) and
15 intravenous infusion of the ABCB1 inhibitor tariquidar (3.75 mg/min, n = 5) or after oral intake of
17 inking between the NBDs was not inhibited by tariquidar, a drug transport inhibitor that stimulates P
18 ucted in humans, examined 2 P-gp inhibitors (tariquidar, a known inhibitor, and disulfiram, a putativ
20 Lop PET during peak plasma concentrations of tariquidar, achieved with concurrent administration of i
22 more, the structurally dissimilar inhibitor, tariquidar, also increased brain uptake with potency equ
26 ir inability to visualize Pgp density, (11)C-tariquidar and (11)C-elacridar may find use as a new cla
27 f the radiolabeled Pgp/BCRP inhibitors (11)C-tariquidar and (11)C-elacridar to assess Pgp density in
31 t would disrupt hydrophobic interaction with tariquidar and inhibit its ability to rescue processing
32 splayed polarised P-gp transport, since both tariquidar and vinblasine selectively increased the apic
35 he subjects who received the highest dose of tariquidar (and had the highest brain uptake), regional
37 .8% increase of whole-brain K1 after 2 mg/kg tariquidar, and 57.9% for 3 mg/kg; in patients with phar
38 sfected HEK-293 cells treated with 1 micro M tariquidar, and ABCG2-transfected cells were 6-7-fold re
39 We found that the modulators zosuquidar, tariquidar, and elacridar stimulated the ATPase activity
42 indicate that both (11)C-elacridar and (11)C-tariquidar are safe radiotracers, for which an injected
46 -like lipid bilayers, in both topotecan- and tariquidar-bound states, characterize the ligand size as
47 e that dLop is trapped in lysosomes and that tariquidar competes with dLop for lysosomal accumulation
48 dLop during tariquidar infusion, when plasma tariquidar concentrations reach their peak, resulted in
49 eased fairly linearly with increasing plasma tariquidar concentrations, but we are uncertain whether
50 aseline K1 and attenuated K1 increases after tariquidar correspond to high P-glycoprotein activity.
51 es, we suspect that plasma concentrations of tariquidar did not fully block P-gp; however, higher dos
53 min infusion of the P-glycoprotein-inhibitor tariquidar followed by another (R)-[(11)C]verapamil PET
56 structures reveal that similar to topotecan, tariquidar induces two distinct ABCG2 conformations unde
58 quidar infusion, injected during intravenous tariquidar infusion, injected after oral tariquidar, and
59 p inhibition, injected 1 h after intravenous tariquidar infusion, injected during intravenous tariqui
65 , we show through cross-linking studies that tariquidar most likely binds to sites within the transme
66 T scan of 120-min duration with either (11)C-tariquidar (n = 6) or (11)C-elacridar (n = 5) followed b
70 lation between distribution volumes of (11)C-tariquidar or (11)C-elacridar and distribution volumes o
76 e was similar with 2 and 4 mg of intravenous tariquidar per kilogram; however, the lower dose was bet
77 measured [(11)C]dLop uptake before and after tariquidar preadministration in lysosome-rich organs of
80 uced at 30 positions significantly inhibited tariquidar rescue of a processing mutant and activation
82 ith concurrent administration of intravenous tariquidar, resulted in greater P-gp inhibition at the h
84 ribution of the ABCG2/ABCB1 substrate [(11)C]tariquidar to the brain both in wild-type (with Abcb1a/b
85 tested in the presence of a P-gp inhibitor (tariquidar) to assess reversibility of transporter-media
90 t fully block P-gp; however, higher doses of tariquidar would likely be associated with unacceptable