Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 112, Issue 16, Pages 5213-5218Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1421507112
Keywords
pain perception; primary sensory neuron; anoctamin 1; TRPV1
Categories
Funding
- Ministry of Education, Culture, Sports, Science and Technology in Japan [26111732]
- Salt Science Research Foundation
- Grants-in-Aid for Scientific Research [25670289, 15K19197, 26111732, 15K15202, 15H02501] Funding Source: KAKEN
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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 alpha beta-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.
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