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. 1992 Nov;107(3):785–789. doi: 10.1111/j.1476-5381.1992.tb14524.x

Pharmacological profile of a high affinity dipeptide NK1 receptor antagonist, FK888.

T Fujii 1, M Murai 1, H Morimoto 1, Y Maeda 1, M Yamaoka 1, D Hagiwara 1, H Miyake 1, N Ikari 1, M Matsuo 1
PMCID: PMC1907758  PMID: 1282073

Abstract

1. In our search for compounds that inhibit the binding of [3H]-substance P (SP) to guinea-pig lung membranes, the dipeptide SP antagonist, FK888, was developed by chemical modification of the parent compound, (D-Pro4, D-Trp7,9,10, Phe11)SP4-11. 2. In a [3H]-SP binding assay using guinea-pig lung membranes and rat brain cortical synaptic membranes, FK888 displaced [3H]-SP binding with a Ki value of 0.69 +/- 0.13 nM and 0.45 +/- 0.17 microM, respectively, in a competitive manner. 3. FK888 inhibited the contraction of guinea-pig isolated ileum induced by SP in the presence of atropine and indomethacin (a NK1 receptor bioassay) with a pA2 value of 9.29 (8.60-9.98). 4. FK888 inhibited contractions of rat vas deferens by NKA (a NK2 receptor bioassay) and of rat portal vein by NKB (a NK3 receptor bioassay) at concentrations at least 10,000 times greater than that required to inhibit contractions of guinea-pig ileum. 5. FK888 also inhibited SP-induced airway oedema in guinea-pig after both intravenous and oral administration. 6. These data demonstrate that FK888 is a potent and selective NK1 antagonist which is active both in vitro and in vivo.

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Selected References

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