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Axonal transport of VR1 capsaicin receptor mRNA in primary afferents and its participation in inflammation‐induced increase in capsaicin sensitivity
Author(s) -
Tohda Chihiro,
Sasaki Miwa,
Konemura Takashi,
Sasamura Takashi,
Itoh Masayuki,
Kuraishi Yasushi
Publication year - 2001
Publication title -
journal of neurochemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.75
H-Index - 229
eISSN - 1471-4159
pISSN - 0022-3042
DOI - 10.1046/j.1471-4159.2001.00193.x
Subject(s) - capsaicin , hyperalgesia , sensory neuron , chemistry , dorsal root ganglion , receptor , endocrinology , medicine , nociceptor , glutamate receptor , axon , nociception , sensory system , neuroscience , biology , biochemistry
Capsaicin receptors are expressed in primary sensory neurons and excited by heat and protons. We examined the inflammation‐induced changes of the level of VR1 capsaicin receptor mRNA in sensory neurons and the sensitivity of primary afferents to capsaicin. Carrageenan treatment induced axonal transport of VR1 mRNA, but not that of preprotachykinin mRNA, from the dorsal root ganglia to central and peripheral axon terminals. The sensitivity of central terminals to capsaicin, which was estimated by measuring the capsaicin‐evoked release of glutamate from the dorsal horn, was increased by peripheral inflammation, and such an increase was suppressed by inhibiting the RNA translation in the dorsal horn with cycloheximide and an intrathecal injection of VR1 antisense oligonucleotides. Thus, peripheral inflammation induces the axonal transport of VR1 mRNA, which may be involved in the hypersensitivity of primary afferents to capsaicin and the production of inflammatory hyperalgesia.