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  • Title: The neurokinin-1 receptor antagonist, sendide, exhibits antinociceptive activity in the formalin test.
    Author: Sakurada T, Katsumata K, Yogo H, Tan-No K, Sakurada S, Ohba M, Kisara K.
    Journal: Pain; 1995 Feb; 60(2):175-180. PubMed ID: 7540280.
    Abstract:
    Sendide is a selective and extremely potent antagonist of neurokinin-1 (NK1) receptors in the mouse spinal cord. The antinociceptive activities of sendide, an antagonist of NK1 receptors, and its analogue, [D-Trp7]sendide have been examined after intrathecal (i.t.) administrations in the mouse paw formalin test. Intrathecal administration of sendide (in pmol) reduced both the early and late phases of the formalin-induced licking response. [D-Trp7]sendide also produced a significant antinociceptive response with less potent activity than sendide. Even highest doses (4000 pmol sendide and 8000 pmol [D-Trp7]sendide) examined, there was no motor paralysis of the hindlimbs. Intrathecal morphine inhibited both the early and late phases of the formalin-induced licking response in a dose-dependent manner. The results indicate that the antinociceptive effects of sendide and [D-Trp7]sendide may be mediated at NK1 receptors in the formalin-induced nociception.
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