INT119098
From wiki-pain
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Sentences Mentioned In
Key: | Protein | Mutation | Event | Anatomy | Negation | Speculation | Pain term | Disease term |
Similar to menthol, both camphor and cinnamaldehyde (initially reported to be specific activators of TRPV3 and TRPA1, respectively) also modulate other thermoTRPs. | |||||||||||||||
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However, human physiological studies demonstrate a paradoxical role of menthol in modulation of warm sensation, and here, we show that menthol also activates heat-activated TRPV3. | |||||||||||||||
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In this study we have shown that both TRPV3 and TRPV1 are increased in peripheral nerve proximal to the site of injury in accord with our previous study of human DRG, [4]. | |||||||||||||||
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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 microm. 2-APB also sensitizes TRPV3 to activation by heat, even at subthreshold concentrations. | |||||||||||||||
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However, human physiological studies demonstrate a paradoxical role of menthol in modulation of warm sensation, and here, we show that menthol also activates heat-activated TRPV3. | |||||||||||||||
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In inside-out membrane patches from TRPV3-expressing cells, 2-APB increases the open probability of TRPV3. | |||||||||||||||
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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 microm. 2-APB also sensitizes TRPV3 to activation by heat, even at subthreshold concentrations. | |||||||||||||||
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TRPV1 and TRPV3 were significantly increased in injured brachial plexus nerves, and TRPV1 in hypersensitive skin after nerve repair, whilst TRPV4 was unchanged. | |||||||||||||||
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We previously reported that human dorsal root ganglion (DRG) sensory neurons co-expressed TRPV1 and TRPV3, and that these were increased in injured human DRG. | |||||||||||||||
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The accumulation of TRPV1 and TRPV3 in peripheral nerves after injury, in spared axons, matches our previously reported changes in avulsed DRG. | |||||||||||||||
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Short duration (1h) exposure of dissociated sensory neurons to NTFs increased numbers of TRPV1-positive neurons, but not of TRPV3, Nav 1.8 and IK1 and the morphological size-distribution remained similar to intact post-mortem DRG neurons. | |||||||||||||||
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Both TRPV3 and TRPV4 were significantly increased in keratinocytes in breast pain tissues; TRPV3, median [range] no pain group, n = 6, 0.75 [02]; pain group, n = 11, 2 [1-3], p = 0.008; TRPV4, median [range] no pain group, n = 6, [01]; pain group, n = 11, 1 [0.52], p = 0.014).
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The recently discovered vanilloid thermoreceptors TRPV3 and TRPV4, which are also expressed by sensory fibres and activated by warmth, were also studied [17,18].
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It may be speculated that increased TRPV3 and TRPV4 in observed in keratinocytes may alter keratinocyte expression of NGF and other molecules, which in turn may sensitise nociceptors.
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After nerve injury both TRPV3 (Fig. 3D) and TRPV1 (Fig 3B) immunoreactive fibres appeared to be increased in both number and intensity but there was no change for TRPV4 (Fig 3F). | |||||||||||||||
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Both TRPV3 and TRPV4 were significantly increased in keratinocytes in breast pain tissues; TRPV3, median [range] no pain group, n = 6, 0.75 [02]; pain group, n = 11, 2 [1-3], p = 0.008; TRPV4, median [range] no pain group, n = 6, [01]; pain group, n = 11, 1 [0.52], p = 0.014).
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Immunoreactivities for both TRPV3 and TRPV1 (% area immunoreactive nerve) were significantly increased after injury [median (range) TRPV3: control 5.25 (0.96.9), injured 15.0 (5.820.1) p < 0.001; TRPV1; control 17.6 (12.120.6), injured 24.1 (18.632.0) p < 0.001; Fig 4A,C] and although image analysis of the nerve marker peripherin showed no change, % ratios of TRPV3 or TRPV1 to peripherin were significantly increased also [median (range) % TRPV3:PPN, control 17.6 (2.919.4), injured 50.1 (25.067.9), p < 0.001; % TRPV1:PPN, control 55.7 (31.982.3), injured 89.8 (63.4100.0), p < 0.001; Fig 4B,D]. | |||||||||||||||
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However, this compound also activates other TRP channels, including TRPV1, TRPV3 and TRPA1. | |||||||||||||||
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The natural compound camphor (Cinnamomum camphora tree, (see above)), which modulates sensations of warmth in humans [29], proved to be an activator of TRPV3 [73]. | |||||||||||||||
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Vanillin, the active ingredient of vanilla (Vanilla planifolia), weakly activates TRPV3, whereas the more potent synthetic vanillin much more potently activates TRPV3. | |||||||||||||||
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General Comments
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