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- W2009271650 abstract "Recently, the transient receptor potential (TRP) channels TRPM8 and TRPA1 have been identified as molecular sensors for cold, and it has been suggested that they play a crucial role in allodynia by modulating voltage-gated calcium channel currents (ICa(V)). The aim of this study was to analyze the modulation of ICa(V) by the TRPM8-agonist icilin in vitro and to investigate the analgesic effect of icilin in a neuropathic pain model in vivo. Whole cell patch-clamp recordings were performed on isolated naïve and injured rat dorsal root ganglia (DRG) neurons, and the analgesic efficacy of icilin applied topically to the paws or intrathecally was tested in rats after spinal nerve ligation (SNL). ICa(V) (depolarization from −80 to 0 mV) in naïve DRG neurons was reduced dose dependently (0.002–200 µM) by icilin (18–80%). Subtype isolation of calcium channels show a marked reduction of L-type channel currents compared to N-type channel currents. The effects of icilin on ICa(V) were not significantly different in non-injured and SNL-injured DRG neurons. In vivo, neither topical (10–200 µM) nor intrathecal application of icilin (0.1 nM to 1 µM) affected tactile allodynia or thermal hyperalgesia after SNL, but it increases cold allodynia 6 h after application. We conclude that the icilin-induced modulation of ICa(V) in DRG neurons is unlikely to mediate analgesic effects or contribute directly to the pathogenesis of cold allodynia in the rat SNL model, but it is a potential mechanism for the analgesic effects of icilin in other pain models." @default.
- W2009271650 created "2016-06-24" @default.
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- W2009271650 date "2014-04-01" @default.
- W2009271650 modified "2023-09-23" @default.
- W2009271650 title "Icilin reduces voltage-gated calcium channel currents in naïve and injured DRG neurons in the rat spinal nerve ligation model" @default.
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- W2009271650 doi "https://doi.org/10.1016/j.brainres.2014.02.022" @default.
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