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Articles, Cellular/Molecular

TRPV1 Mediates Histamine-Induced Itching via the Activation of Phospholipase A2 and 12-Lipoxygenase

Won-Sik Shim, Min-Ho Tak, Mi-Hyun Lee, Minjung Kim, Minkyung Kim, Jae-Yeon Koo, Chang-Hun Lee, Misook Kim and Uhtaek Oh
Journal of Neuroscience 28 February 2007, 27 (9) 2331-2337; DOI: https://doi.org/10.1523/JNEUROSCI.4643-06.2007
Won-Sik Shim
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Min-Ho Tak
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Mi-Hyun Lee
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Minjung Kim
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Minkyung Kim
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Jae-Yeon Koo
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Chang-Hun Lee
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Misook Kim
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Uhtaek Oh
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Abstract

Histamine provokes itching and is a major skin disease complaint. Histamine is known to excite a subset of sensory neurons, predominantly C-fibers. Although histamine is pruritogenic, its signaling pathways that excite sensory neurons have not been identified. Because the metabolic products of lipoxygenases (LOs) activate transient receptor potential vanilloid receptor-1 (TRPV1) in sensory neurons, we hypothesized that histamine excites sensory neurons by activating TRPV1 via phospholipase A2 (PLA2) and LO stimulation. In cultured sensory neurons, histamine evoked inward currents that were reduced by capsazepine, a TRPV1 blocker. Moreover, histamine provoked inward currents when histamine receptor subtype 1 (H1R) and TRPV1 were expressed heterologously, but not when H1R or TRPV1 was expressed alone. In addition, histamine caused Ca2+ influxes in sensory neurons in wild-type mice but not in TRPV1−/− mice. Furthermore, histamine caused a 2.5-fold increase in the production of 12-hydroxyeicosatetraenoic acid, a metabolite of LO, in cultured sensory neurons. When injected subcutaneously into the necks of mice, histamine caused bouts of scratching, which were greatly reduced by pretreatment with capsazepine, a TRPV1 blocker, and by inhibitors of PLA2, LO, and H1R. Furthermore, mice lacking TRPV1 markedly reduced histamine-induced scratching compared with wild type. Together, these results indicate that TRPV1 plays a key role in mediating the pruritogenic action of histamine via the PLA2/LO pathway.

  • histamine
  • TRPV1
  • phospholipase A2
  • 12-lipoxygenase
  • itch
  • pruritus
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The Journal of Neuroscience: 27 (9)
Journal of Neuroscience
Vol. 27, Issue 9
28 Feb 2007
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TRPV1 Mediates Histamine-Induced Itching via the Activation of Phospholipase A2 and 12-Lipoxygenase
Won-Sik Shim, Min-Ho Tak, Mi-Hyun Lee, Minjung Kim, Minkyung Kim, Jae-Yeon Koo, Chang-Hun Lee, Misook Kim, Uhtaek Oh
Journal of Neuroscience 28 February 2007, 27 (9) 2331-2337; DOI: 10.1523/JNEUROSCI.4643-06.2007

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TRPV1 Mediates Histamine-Induced Itching via the Activation of Phospholipase A2 and 12-Lipoxygenase
Won-Sik Shim, Min-Ho Tak, Mi-Hyun Lee, Minjung Kim, Minkyung Kim, Jae-Yeon Koo, Chang-Hun Lee, Misook Kim, Uhtaek Oh
Journal of Neuroscience 28 February 2007, 27 (9) 2331-2337; DOI: 10.1523/JNEUROSCI.4643-06.2007
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