Contribution of mechanoreceptors to spinal cord injury-induced mechanical allodynia
Evidence from previous studies supports the concept that spinal cord injury (SCI)-induced neuropathic pain (NP) has its neural roots in the peripheral nervous system. There is uncertainty about how and to which degree mechanoreceptors contribute. Sensorimotor activation-based interventions (eg, trea...
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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
June 2024
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| In: |
Pain
Year: 2024, Volume: 165, Issue: 6, Pages: 1336-1347 |
| ISSN: | 1872-6623 |
| DOI: | 10.1097/j.pain.0000000000003139 |
| Online Access: | Verlag, kostenfrei, Volltext: https://doi.org/10.1097/j.pain.0000000000003139 Verlag, kostenfrei, Volltext: https://journals.lww.com/pain/fulltext/2024/06000/contribution_of_mechanoreceptors_to_spinal_cord.15.aspx 
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| Author Notes: | Christopher Sliwinski, Laura Heutehaus, Francisco J. Taberner, Lisa Weiss, Vasileios Kampanis, Bahardokht Tolou-Dabbaghian, Xing Cheng, Melanie Motsch, Paul A. Heppenstall, Rohini Kuner, Steffen Franz, Stefan G. Lechner, Norbert Weidner, Radhika Puttagunta |
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| 520 | |a Evidence from previous studies supports the concept that spinal cord injury (SCI)-induced neuropathic pain (NP) has its neural roots in the peripheral nervous system. There is uncertainty about how and to which degree mechanoreceptors contribute. Sensorimotor activation-based interventions (eg, treadmill training) have been shown to reduce NP after experimental SCI, suggesting transmission of pain-alleviating signals through mechanoreceptors. The aim of the present study was to understand the contribution of mechanoreceptors with respect to mechanical allodynia in a moderate mouse contusion SCI model. After genetic ablation of tropomyosin receptor kinase B expressing mechanoreceptors before SCI, mechanical allodynia was reduced. The identical genetic ablation after SCI did not yield any change in pain behavior. Peptidergic nociceptor sprouting into lamina III/IV below injury level as a consequence of SCI was not altered by either mechanoreceptor ablation. However, skin-nerve preparations of contusion SCI mice 7 days after injury yielded hyperexcitability in nociceptors, not in mechanoreceptors, which makes a substantial direct contribution of mechanoreceptors to NP maintenance unlikely. Complementing animal data, quantitative sensory testing in human SCI subjects indicated reduced mechanical pain thresholds, whereas the mechanical detection threshold was not altered. Taken together, early mechanoreceptor ablation modulates pain behavior, most likely through indirect mechanisms. Hyperexcitable nociceptors seem to be the main drivers of SCI-induced NP. Future studies need to focus on injury-derived factors triggering early-onset nociceptor hyperexcitability, which could serve as targets for more effective therapeutic interventions. | ||
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