SCN10A Mutation in a Patient with Erythromelalgia Enhances C-Fiber Activity Dependent Slowing
Gain-of-function mutations in the tetrodotoxin (TTX) sensitive voltage-gated sodium channel (Nav) Nav1.7 have been identified as a key mechanism underlying chronic pain in inherited erythromelalgia. Mutations in TTX resistant channels, such as Nav1.8 or Nav1.9, were recently connected with inherited...
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| Hauptverfasser: | , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
September 6, 2016
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| In: |
PLOS ONE
Year: 2016, Jahrgang: 11, Heft: 9 |
| ISSN: | 1932-6203 |
| DOI: | 10.1371/journal.pone.0161789 |
| Online-Zugang: | Verlag, Volltext: https://doi.org/10.1371/journal.pone.0161789 Verlag, Volltext: https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0161789 
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| Verfasserangaben: | Andreas M. Kist, Dagrun Sagafos, Anthony M. Rush, Cristian Neacsu, Esther Eberhardt, Roland Schmidt, Lars Kristian Lunden, Kristin Ørstavik, Luisa Kaluza, Jannis Meents, Zhiping Zhang, Thomas Hedley Carr, Hugh Salter, David Malinowsky, Patrik Wollberg, Johannes Krupp, Inge Petter Kleggetveit, Martin Schmelz, Ellen Jørum, Angelika Lampert, Barbara Namer |
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| 520 | |a Gain-of-function mutations in the tetrodotoxin (TTX) sensitive voltage-gated sodium channel (Nav) Nav1.7 have been identified as a key mechanism underlying chronic pain in inherited erythromelalgia. Mutations in TTX resistant channels, such as Nav1.8 or Nav1.9, were recently connected with inherited chronic pain syndromes. Here, we investigated the effects of the p.M650K mutation in Nav1.8 in a 53 year old patient with erythromelalgia by microneurography and patch-clamp techniques. Recordings of the patient’s peripheral nerve fibers showed increased activity dependent slowing (ADS) in CMi and less spontaneous firing compared to a control group of erythromelalgia patients without Nav mutations. To evaluate the impact of the p.M650K mutation on neuronal firing and channel gating, we performed current and voltage-clamp recordings on transfected sensory neurons (DRGs) and neuroblastoma cells. The p.M650K mutation shifted steady-state fast inactivation of Nav1.8 to more hyperpolarized potentials and did not significantly alter any other tested gating behaviors. The AP half-width was significantly broader and the stimulated action potential firing rate was reduced for M650K transfected DRGs compared to WT. We discuss the potential link between enhanced steady state fast inactivation, broader action potential width and the potential physiological consequences. | ||
| 650 | 4 | |a Functional electrical stimulation | |
| 650 | 4 | |a Membrane potential | |
| 650 | 4 | |a Nerve fibers | |
| 650 | 4 | |a Neurons | |
| 650 | 4 | |a Neuropathic pain | |
| 650 | 4 | |a Nociceptors | |
| 650 | 4 | |a Pain sensation | |
| 650 | 4 | |a Sodium | |
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