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Pain. 2019 Jun;160(6):1327-1341. doi: 10.1097/j.pain.0000000000001511.

The role of Nav1.7 in human nociceptors: insights from human induced pluripotent stem cell-derived sensory neurons of erythromelalgia patients.

Author information

1
Institute of Physiology, Medical Faculty, RWTH Aachen University, Aachen, Germany. Dr. Bressan is now with the German Center for Neurodegenerative Diseases (DZNE), Tübingen, Germany.
2
Department of Cell Biology, Institute for Biomedical Engineering, Medical Faculty, RWTH Aachen University, Aachen, Germany. Dr. Sontag is now with the Taconic Biosciences GmbH, Köln, Germany.
3
Helmholtz-Institute for Biomedical Engineering, RWTH Aachen University, Aachen, Germany.
4
Institute for Physiology and Pathophysiology, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany.
5
Institute of Human Genetics, Uniklinik RWTH Aachen, Aachen, Germany.
6
Division of Stem Cell Biology and Cellular Engineering, Helmholtz-Institute for Biomedical Engineering, RWTH Aachen University, Aachen, Germany.
7
Section of Clinical Neurophysiology, Department of Neurology, Oslo University Hospital-Rikshospitalet, Oslo, Norway.
8
Metrion Biosciences, Cambridge, United Kingdom.
9
Department of Molecular Neurology, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany.
10
Department of Experimental Pain Research Mannheim, Heidelberg University, Mannheim, Germany.
11
Institute of Clinical Medicine, University of Oslo, Oslo, Norway.
12
Department of Stem Cell Biology, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany.

Abstract

The chronic pain syndrome inherited erythromelalgia (IEM) is attributed to mutations in the voltage-gated sodium channel (NaV) 1.7. Still, recent studies targeting NaV1.7 in clinical trials have provided conflicting results. Here, we differentiated induced pluripotent stem cells from IEM patients with the NaV1.7/I848T mutation into sensory nociceptors. Action potentials in these IEM nociceptors displayed a decreased firing threshold, an enhanced upstroke, and afterhyperpolarization, all of which may explain the increased pain experienced by patients. Subsequently, we investigated the voltage dependence of the tetrodotoxin-sensitive NaV activation in these human sensory neurons using a specific prepulse voltage protocol. The IEM mutation induced a hyperpolarizing shift of NaV activation, which leads to activation of NaV1.7 at more negative potentials. Our results indicate that NaV1.7 is not active during subthreshold depolarizations, but that its activity defines the action potential threshold and contributes significantly to the action potential upstroke. Thus, our model system with induced pluripotent stem cell-derived sensory neurons provides a new rationale for NaV1.7 function and promises to be valuable as a translational tool to profile and develop more efficacious clinical analgesics.

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