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Loss-of-function of Nav1.8/D1639N linked to human pain can be rescued by lidocaine

  • Molecular and cellular mechanisms of disease
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Abstract

Mutations in voltage-gated sodium channels are associated with altered pain perception in humans. Most of these mutations studied to date present with a direct and intuitive link between the altered electrophysiological function of the channel and the phenotype of the patient. In this study, we characterize a variant of Nav1.8, D1639N, which has been previously identified in a patient suffering from the chronic pain syndrome “small fiber neuropathy”. Using a heterologous expression system and patch-clamp analysis, we show that Nav1.8/D1639N reduces current density without altering biophysical gating properties of Nav1.8. Therefore, the D1639N variant causes a loss-of-function of the Nav1.8 sodium channel in a patient suffering from chronic pain. Using immunocytochemistry and biochemical approaches, we show that Nav1.8/D1639N impairs trafficking of the channel to the cell membrane. Neither co-expression of β1 or β3 subunit, nor overnight incubation at 27 °C rescued current density of the D1639N variant. On the other hand, overnight incubation with lidocaine fully restored current density of Nav1.8/D1639N most likely by overcoming the trafficking defect, whereas phenytoin failed to do so. Since lidocaine rescues the loss-of-function of Nav1.8/D1639N, it may offer a future therapeutic option for the patient carrying this variant. These results demonstrate that the D1639N variant, identified in a patient suffering from chronic pain, causes loss-of-function of the channel due to impaired cell surface trafficking and that this trafficking defect can be rescued by lidocaine.

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Acknowledgments

We thank Brigitte Hoch for excellent technical assistance. This work was supported by the Core Facility Flow Cytometry, a Core Facility of the Interdisciplinary Center for Clinical Research (IZKF) Aachen within the Faculty of Medicine at RWTH Aachen University.

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This study was funded in parts by the DFG (HA 6095/1-2 to RH, LA 2740/3-1 to AL).

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Kaluza, L., Meents, J.E., Hampl, M. et al. Loss-of-function of Nav1.8/D1639N linked to human pain can be rescued by lidocaine. Pflugers Arch - Eur J Physiol 470, 1787–1801 (2018). https://doi.org/10.1007/s00424-018-2189-x

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