Local Administration of a Synthetic Cell-Penetrating Peptide Antagonizing TrkA Function Suppresses Inflammatory Pain in Rats
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概要
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Novel agents that inhibit nerve growth factor signaling are required for the treatment of inflammatory pain. The present study investigated the effect of local administration of inhibitory peptide of TrkA (IPTRK3), a synthetic cell-penetrating peptide that antagonizes TrkA function, in complete Freund’s adjuvant (CFA)–induced hyperalgesia in rats. Three hours after subcutaneous injection of CFA into the plantar surface of the rat’s left hind paw, 10 mM IPTRK3 was injected at the same site. Thermal and mechanical hyperalgesia were tested in the ipsilateral hind paw until 7 days after CFA injection. The ipsilateral dorsal root ganglion (DRG) was dissected out for immunohistochemical analysis of transient receptor potential vanilloid subfamily member 1 (TRPV1) channels and TrkA. Local injection of this peptide significantly suppressed both thermal and mechanical hyperalgesia produced by CFA and also significantly reduced TRPV1 expression at the DRG. These results suggest that local administration of IPTRK3 is likely effective in the treatment of inflammatory pain in rats.
著者
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IKEDA Hiroshi
Department of Neurosurgery, Japanese Red Cross Nagoya Daiichi Hospital
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Murata Eri
Department of Anesthesiology and Reanimatology, University of Fukui, Faculty of Medical Sciences, Ja
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Ueda Koyo
Department of Anesthesiology and Reanimatology, University of Fukui, Faculty of Medical Sciences, Ja
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Shigemi Kenji
Department of Anesthesiology and Reanimatology, University of Fukui, Faculty of Medical Sciences, Ja
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Hirose Munetaka
Department of Anesthesiology and Reanimatology, University of Fukui, Faculty of Medical Sciences, Ja
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UEDA Masashi
Department of Patho-Functional Bioanalysis, Graduate School of Pharmaceutical Sciences, Kyoto Univer
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TAKATORI Mayumi
Department of Anesthesiology, Kyoto Prefectural University of Medicine
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