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The Journal of Neuroscience, June 2, 2004, 24(22):5177-5182; doi:10.1523/JNEUROSCI.0934-04.2004
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2-Aminoethoxydiphenyl Borate Activates and Sensitizes the Heat-Gated Ion Channel TRPV3
Man-Kyo Chung,1 Hyosang Lee,1 Atsuko Mizuno,2 Makoto Suzuki,2 andMichael J. Caterina1 1Departments of Biological Chemistry and Neuroscience, Johns Hopkins School of Medicine, Baltimore, Maryland 21205, and 2Department of Pharmacology, Jichi Medical School, Miamikawachi, Tochigi, 329-0498, Japan
Six of the mammalian transient receptor potential (TRP) ion channel subtypes are nonselective cation channels that can be activated by increases or decreases in ambient temperature. Five of them can alternatively be activated by nonthermal stimuli such as capsaicin [transient receptor potential vanilloid 1 (TRPV1)] or hypo-osmolarity (TRPV2 and TRPV4). No nonthermal stimuli have yet been described for TRPV3, a warmth-gated ion channel expressed prominently in skin keratinocytes. Here, we demonstrate that 2-aminoethoxydiphenyl borate (2-APB), a compound used to inhibit store-operated Ca2+ channels and IP3 receptors, produces robust activation of recombinant TRPV3 in human embryonic kidney 293 cells with an EC50 of 28 µM. 2-APB also sensitizes TRPV3 to activation by heat, even at subthreshold concentrations. In inside-out membrane patches from TRPV3-expressing cells, 2-APB increases the open probability of TRPV3. Also, whereas heat alone is capable of activating TRPV3-mediated currents in only a small proportion of primary mouse keratinocytes, 2-APB activates heat-evoked, TRPV3-mediated currents in the majority of these cells. Together, these findings identify 2-APB as the first known chemical activator of TRPV3 and enhance the notion that TRPV3 participates in the detection of heat by keratinocytes.
Key words: 2-APB; TRPV3; heat; thermosensation; keratinocytes; temperature
Received March 13, 2004; revised April 21, 2004; accepted April 23, 2004.
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