title: Pain-enhancing mechanism through interaction between TRPV1 and anoctamin 1 in sensory neurons.
abstract: The capsaicin receptor transient receptor potential cation channel vanilloid 1 (TRPV1) is activated by various noxious stimuli, and the stimuli are converted into electrical signals in primary sensory neurons. It is believed that cation influx through TRPV1 causes depolarization, leading to the activation of voltage-gated sodium channels, followed by the generation of action potential. Here we report that the capsaicin-evoked action potential could be induced by two components: a cation influx-mediated depolarization caused by TRPV1 activation and a subsequent anion efflux-mediated depolarization via activation of anoctamin 1 (ANO1), a calcium-activated chloride channel, resulting from the entry of calcium through TRPV1. The interaction between TRPV1 and ANO1 is based on their physical binding. Capsaicin activated the chloride currents in an extracellular calcium-dependent manner in HEK293T cells expressing TRPV1 and ANO1. Similarly, in mouse dorsal root ganglion neurons, capsaicin-activated inward currents were inhibited significantly by a specific ANO1 antagonist, T16Ainh-A01 (A01), in the presence of a high concentration of EGTA but not in the presence of BAPTA [1,2-bis(o-aminophenoxy)ethane-N,N,N',N'-tetraacetic acid]. The generation of a capsaicin-evoked action potential also was inhibited by A01. Furthermore, pain-related behaviors in mice treated with capsaicin, but not with αβ-methylene ATP, were reduced significantly by the concomitant administration of A01. These results indicate that TRPV1-ANO1 interaction is a significant pain-enhancing mechanism in the peripheral nervous system.
authors.affiliation: Division of Cell Signaling, Okazaki Institute for Integrative Bioscience, Okazaki 444-8787, Japan;
authors.forename: Yasunori
authors.initials: Y
authors.lastname: Takayama
authors.affiliation: Department of Applied Pharmacology, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama 930-0194, Japan;
authors.forename: Daisuke
authors.initials: D
authors.lastname: Uta
authors.affiliation: Division of Neural Signaling, National Institute for Physiological Sciences, Okazaki 444-8787, Japan; and Department of Physiological Sciences, Graduate University for Advanced Studies, Okazaki 444-8787, Japan.
authors.forename: Hidemasa
authors.initials: H
authors.lastname: Furue
authors.affiliation: Division of Cell Signaling, Okazaki Institute for Integrative Bioscience, Okazaki 444-8787, Japan; Department of Physiological Sciences, Graduate University for Advanced Studies, Okazaki 444-8787, Japan tominaga@nips.ac.jp.
authors.forename: Makoto
authors.initials: M
authors.lastname: Tominaga
mesh_terms: D000818:Animals; D000075369:Anoctamin-1; D001522:Behavior, Animal / Q000187:drug effects; D002211:Capsaicin / Q000494:pharmacology; D018118:Chloride Channels / Q000378:metabolism*; D019706:Excitatory Postsynaptic Potentials / Q000187:drug effects; D005727:Ganglia, Spinal / Q000187:drug effects / Q000378:metabolism; D057809:HEK293 Cells; D006801:Humans; D008810:Mice, Inbred C57BL; D008954:Models, Biological; D010146:Pain / Q000378:metabolism*; D017729:Presynaptic Terminals / Q000187:drug effects / Q000378:metabolism; D011485:Protein Binding / Q000187:drug effects; D011984:Sensory Receptor Cells / Q000187:drug effects / Q000378:metabolism*; D050916:TRPV Cation Channels / Q000378:metabolism*
chemical_list: C531181:ANO1 protein, mouse; D000075369:Anoctamin-1; D018118:Chloride Channels; D050916:TRPV Cation Channels; C493921:TRPV1 protein, mouse; D002211:Capsaicin
keywords: TRPV1; anoctamin 1; pain perception; primary sensory neuron
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