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• W1999320545 abstract "Interest in central neurokinin (NK) 1 receptors has increased based on reports of the therapeutic potential for NK1 antagonists in anxiety and depression. In these studies, an ex vivo binding procedure was used to correlate NK1 receptor occupancy in striatum by NK1 antagonists with their potency to inhibit NK1 agonist-induced foot tapping in gerbils (GFT). The following compounds were administered orally: CP-99,994 [(+)-<i>cis-n</i>-[(2-methoxyphenyl)methyl]-2-phenyl-3-piperidinamine), L-742,694 [5-[[2(<i>S</i>)-[[3,5-bis(trifluoromethyl)phenyl]methoxy]-3(<i>S</i>)-phenyl-4-morpholinyl]methyl]-2,4-dihydro-3<i>H</i>-1,2,4-triazol-3-one]), MK-869 [5-[[2(<i>R</i>)-[1(<i>R</i>)-[3,5-bis(trifluoromethyl)phenyl]ethoxy]-3(<i>S</i>)-(4-fluorophenyl)-4-morpholinyl]methyl]-2,4-dihydro-3<i>H</i>-1,2,4-triazol-3-one], CP-122,721 [<i>cis</i>-<i>n</i>-[[2-methoxy-5-(trifluoromethoxy)phenyl]methyl]-2-phenyl-3-piperidinamine], L-760,735-F [4-[[2(<i>R</i>)-[1(<i>R</i>)-[3,5-bis(trifluoromethyl)phenyl]ethoxy]-3(<i>S</i>)-(4-fluorophenyl)-4-morpholinyl]methyl]-<i>N,N</i>-dimethyl-1<i>H</i>-1,2,3-triazole-5- methanamine], GR205171 [<i>N</i>-[[2-methoxy-5-[5-(trifluoromethyl)-1<i>H</i>-tetrazol-1-yl]phenyl]methy]-2(<i>S</i>)-phenyl-3(<i>S</i>)-piperidinamine], L-733,060 [(2<i>S</i>,3<i>S</i>)3-([3,5-bis(trifluoro methyl)phenyl]methoxy)-2-phenylpiperidine], and L-733,061 [(2<i>R</i>,3<i>R</i>)-3-([3,5-bis(trifluoromethyl)phenyl]methoxy)-2-phenylpiperidine]. Two hours later, gerbils received the NK1 agonist GR73632 [H₂N-(CH₂)₄-CO-Phe-Pro-NMe-Leu-Met-NH₂] i.c.v. and foot tapping was measured for 5 min. The same procedure was used for ex vivo binding studies except that saline, rather than agonist, was administered i.c.v. before dissection of the striatum. The tissue homogenate was then used in an equilibrium radioligand binding assay. When IC₅₀ values for inhibition of ex vivo¹²⁵I-substance P binding by NK1 antagonists were compared with the corresponding EC₅₀ values for inhibition of GFT, a significant positive correlation was observed (<i>r</i>² = 0.97, <i>p</i> < 0.001). This result indicates that increased NK1 receptor occupancy in striatum by NK1 antagonists parallels the inhibition of agonist-mediated GFT. For all compounds, the dose that produced the maximum inhibition of GFT resulted in less than 100% ex vivo receptor occupancy in striatum. When gerbils did not receive the i.c.v. saline injection before ex vivo binding, thereby leaving the blood-brain barrier (BBB) intact, the IC₅₀ values for antagonists were unchanged, suggesting that potential damage to the BBB caused by the i.c.v. injection did not affect determinations of antagonist potency in the GFT model." @default.
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• W1999320545 date "2002-05-01" @default.
• W1999320545 modified "2023-10-04" @default.
• W1999320545 title "Correlation of Neurokinin (NK) 1 Receptor Occupancy in Gerbil Striatum with Behavioral Effects of NK1 Antagonists" @default.
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• W1999320545 doi "https://doi.org/10.1124/jpet.301.2.536" @default.
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