Assessing the Effects of the Topical Application of L-Menthol on Pain-Related Somatosensory-Evoked Potentials Using Intra-Epidermal Stimulation
L-menthol is known to activate transient receptor potential melastatin 8 (TRPM8) and induce analgesia to thermal stimuli. However, since thermal stimulation leads to the interaction among the other TRP channels, it was unclear whether L-menthol causes analgesia to stimuli other than thermal stimuli....
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MDPI AG
2023-06-01
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| Series: | Brain Sciences |
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| Online Access: | https://www.mdpi.com/2076-3425/13/6/918 |
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| author | Taiki Makibuchi Koya Yamashiro Sayaka Anazawa Tomomi Fujimoto Genta Ochi Koyuki Ikarashi Daisuke Sato |
| author_facet | Taiki Makibuchi Koya Yamashiro Sayaka Anazawa Tomomi Fujimoto Genta Ochi Koyuki Ikarashi Daisuke Sato |
| author_sort | Taiki Makibuchi |
| collection | DOAJ |
| description | L-menthol is known to activate transient receptor potential melastatin 8 (TRPM8) and induce analgesia to thermal stimuli. However, since thermal stimulation leads to the interaction among the other TRP channels, it was unclear whether L-menthol causes analgesia to stimuli other than thermal stimuli. Therefore, we aimed to investigate whether activating TRPM8 via topical application of 10% menthol solution attenuates pain-related somatosensory-evoked potentials (pSEPs) and affects numerical rating scale (NRS) score using intra-epidermal electrical stimulation (IES). We applied 10% L-menthol or control solution on the dorsum of the right hand of 25 healthy participants. The pSEP and NRS, elicited by IES, and sensory threshold were measured before and after each solution was applied. The results showed that the topical application of 10% L-menthol solution significantly reduced N2–P2 amplitude in pSEPs compared with the control solution. Moreover, the N2 latency was significantly prolonged upon the topical application of L-menthol solution. NRS scores were similar under both conditions. These results suggest that topical application of L-menthol does not alter subjective sensation induced using IES, although it may attenuate afferent signals at free nerve endings even with stimuli that do not directly activate TRP channels. |
| first_indexed | 2024-03-11T02:41:08Z |
| format | Article |
| id | doaj.art-cb9761032a4f41158e2ed1221bb7d49e |
| institution | Directory Open Access Journal |
| issn | 2076-3425 |
| language | English |
| last_indexed | 2024-03-11T02:41:08Z |
| publishDate | 2023-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Brain Sciences |
| spelling | doaj.art-cb9761032a4f41158e2ed1221bb7d49e2023-11-18T09:36:22ZengMDPI AGBrain Sciences2076-34252023-06-0113691810.3390/brainsci13060918Assessing the Effects of the Topical Application of L-Menthol on Pain-Related Somatosensory-Evoked Potentials Using Intra-Epidermal StimulationTaiki Makibuchi0Koya Yamashiro1Sayaka Anazawa2Tomomi Fujimoto3Genta Ochi4Koyuki Ikarashi5Daisuke Sato6Institute for Human Movement and Medical Sciences, Niigata University of Health and Welfare, Niigata 950-3198, JapanInstitute for Human Movement and Medical Sciences, Niigata University of Health and Welfare, Niigata 950-3198, JapanField of Health and Sports, Graduate School of Niigata University of Health and Welfare, Niigata 950-3198, JapanInstitute for Human Movement and Medical Sciences, Niigata University of Health and Welfare, Niigata 950-3198, JapanInstitute for Human Movement and Medical Sciences, Niigata University of Health and Welfare, Niigata 950-3198, JapanInstitute for Human Movement and Medical Sciences, Niigata University of Health and Welfare, Niigata 950-3198, JapanInstitute for Human Movement and Medical Sciences, Niigata University of Health and Welfare, Niigata 950-3198, JapanL-menthol is known to activate transient receptor potential melastatin 8 (TRPM8) and induce analgesia to thermal stimuli. However, since thermal stimulation leads to the interaction among the other TRP channels, it was unclear whether L-menthol causes analgesia to stimuli other than thermal stimuli. Therefore, we aimed to investigate whether activating TRPM8 via topical application of 10% menthol solution attenuates pain-related somatosensory-evoked potentials (pSEPs) and affects numerical rating scale (NRS) score using intra-epidermal electrical stimulation (IES). We applied 10% L-menthol or control solution on the dorsum of the right hand of 25 healthy participants. The pSEP and NRS, elicited by IES, and sensory threshold were measured before and after each solution was applied. The results showed that the topical application of 10% L-menthol solution significantly reduced N2–P2 amplitude in pSEPs compared with the control solution. Moreover, the N2 latency was significantly prolonged upon the topical application of L-menthol solution. NRS scores were similar under both conditions. These results suggest that topical application of L-menthol does not alter subjective sensation induced using IES, although it may attenuate afferent signals at free nerve endings even with stimuli that do not directly activate TRP channels.https://www.mdpi.com/2076-3425/13/6/918L-mentholpain-related somatosensory-evoked potentialstransient receptor potential melastatin 8intra-epidermal electrical stimulation |
| spellingShingle | Taiki Makibuchi Koya Yamashiro Sayaka Anazawa Tomomi Fujimoto Genta Ochi Koyuki Ikarashi Daisuke Sato Assessing the Effects of the Topical Application of L-Menthol on Pain-Related Somatosensory-Evoked Potentials Using Intra-Epidermal Stimulation Brain Sciences L-menthol pain-related somatosensory-evoked potentials transient receptor potential melastatin 8 intra-epidermal electrical stimulation |
| title | Assessing the Effects of the Topical Application of L-Menthol on Pain-Related Somatosensory-Evoked Potentials Using Intra-Epidermal Stimulation |
| title_full | Assessing the Effects of the Topical Application of L-Menthol on Pain-Related Somatosensory-Evoked Potentials Using Intra-Epidermal Stimulation |
| title_fullStr | Assessing the Effects of the Topical Application of L-Menthol on Pain-Related Somatosensory-Evoked Potentials Using Intra-Epidermal Stimulation |
| title_full_unstemmed | Assessing the Effects of the Topical Application of L-Menthol on Pain-Related Somatosensory-Evoked Potentials Using Intra-Epidermal Stimulation |
| title_short | Assessing the Effects of the Topical Application of L-Menthol on Pain-Related Somatosensory-Evoked Potentials Using Intra-Epidermal Stimulation |
| title_sort | assessing the effects of the topical application of l menthol on pain related somatosensory evoked potentials using intra epidermal stimulation |
| topic | L-menthol pain-related somatosensory-evoked potentials transient receptor potential melastatin 8 intra-epidermal electrical stimulation |
| url | https://www.mdpi.com/2076-3425/13/6/918 |
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