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BEHAVIORAL PHARMACOLOGY

Antinociceptive Pharmacology of N-[[4-(4,5-Dihydro-1H-imidazol-2-yl)phenyl]methyl]-2-[2-[[(4-methoxy-2,6-dimethylphenyl) sulfonyl]methylamino]ethoxy]-N-methylacetamide, Fumarate (LF22-0542), a Novel Nonpeptidic Bradykinin B₁ Receptor Antagonist

Department of Pharmacology, University of Arizona, Tucson, Arizona (F.P., T.W.V., W.G.); and Centre de Recherche, Fournier Pharma, Daix, France (M.B., P.D., V.P., J.M.L., J.-L.J., D.P.)

The antinociceptive pharmacology of N-[[4-(4,5-dihydro-1H-imidazol-2-yl)phenyl]methyl]-2-[2-[[(4-methoxy-2,6-dimethylphenyl) sulfonyl]methylamino]ethoxy]-N-methylacetamide fumarate (LF22-0542), a novel nonpeptidic B₁ antagonist, was characterized. LF22-0542 showed high affinity for human and mouse B₁ receptors with virtually no affinity for the human B₂ receptor; a selectivity index of at least 4000 times was obtained when LF22-0542 was profiled throughout binding or cell biology assays on 64 other G-protein-coupled receptor, 10 ion channels, and seven enzymes. LF22-0542 was a competitive B₁ receptor antagonist and elicited significant antinociceptive actions in the mouse acetic acid-induced writhing assay, as well as in the second phases of formalin-induced nociception in mice and in both the first and second phases of the formalin response in rats. LF22-0542 was active after s.c. but not p.o. administration. In B₁ receptor knockout (KO) mice, acetic acid and formalin responses were significantly reduced and LF22-0542 had no additional effects in these animals. LF22-0542 alleviated thermal hypersensitivity in both acute (carrageenan) and persistent inflammatory (complete Freund's adjuvant) pain models in rats. LF22-0542 produced a full reversal of experimental neuropathic thermal hypersensitivity but was inactive in reversing nerve injury-induced tactile hypersensitivity in rats. In agreement with this observation, B₁ KO mice subjected to peripheral nerve injury did not show thermal hypersensitivity but developed nerve injury-induced tactile hypersensitivity normally. The data demonstrate the antihyperalgesic actions of a selective systemically administered B₁ receptor antagonist and suggest the utility of this class of agents for the treatment of inflammatory pain states and for some aspects of neuropathic pain.

Address correspondence to: Dr. Frank Porreca, University of Arizona, Arizona Health Sciences Center, Tucson, AZ 85724. E-mail: frankp{at}u.arizona.edu

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