Publications

Latest publication 08/12/2011

Nav1-9 Channel Contributes to Mechanical and Heat Pain Hypersensitivity Induced

Inflammation is known to be responsible for the sensitization of peripheral sensory neurons, leading to spontaneous pain and invalidating pain...

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    [title] => Nav1-9 Channel Contributes to Mechanical and Heat Pain Hypersensitivity Induced 
    [paragraph] => Nav1.9 Channel Contributes to Mechanical and Heat Pain Hypersensitivity Induced by Subacute and Chronic Inflammation
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Authors
Stéphane Lolignier, Muriel Amsalem, François Maingret, Françoise Padilla, Mélanie Gabriac, Eric Chapuy, Alain Eschalier, Patrick Delmas, Jérôme Busserolles

 Lab
Clermont Université, Laboratoire de Pharmacologie Fondamentale et Clinique de la Douleur, Clermont-Ferrand, France
Journal
PLOS ONE
Abstract
Inflammation is known to be responsible for the sensitization of peripheral sensory neurons, leading to spontaneous pain and invalidating pain hypersensitivity. Given its role in regulating neuronal excitability, the voltage-gated Nav1.9 channel is a potential target for the treatment of pathological pain, but its implication in inflammatory pain is yet not fully described. In the present study, we examined the role of the Nav1.9 channel in acute, subacute and chronic inflammatory pain using Nav1.9- mice and Nav1.9 knock-down rats. In mice we found that, although the Nav1.9 channel does not contribute to basal pain thresholds, it plays an important role in heat pain hypersensitivity induced by subacute paw inflammation (intraplantar carrageenan) and chronic ankle inflammation (complete Freund's adjuvant-induced monoarthritis). We showed for the first time that Nav1.9 also contributes to mechanical hypersensitivity in both models, as assessed using von Frey and dynamic weight bearing tests. Consistently, antisense-based Nav1.9 gene silencing in rats reduced carrageenan-induced heat and mechanical pain hypersensitivity. While no changes in Nav1.9 mRNA levels were detected in dorsal root ganglia (DRGs) during subacute and chronic inflammation, a significant increase in Nav1.9 immunoreactivity was observed in ipsilateral DRGs 24 hours following carrageenan injection. This was correlated with an increase in Nav1.9 immunolabeling in nerve fibers surrounding the inflamed area. No change in Nav1.9 current density could be detected in the soma of retrolabeled DRG neurons innervating inflamed tissues, suggesting that newly produced channels may be non-functional at this level and rather contribute to the observed increase in axonal transport. Our results provide evidence that Nav1.9 plays a crucial role in the generation of heat and mechanical pain hypersensitivity, both in subacute and chronic inflammatory pain models, and bring new elements for the understanding of its regulation in those models.
BIOSEB Instruments Used
Dynamic Weight Bearing 2.0 (BIO-DWB-DUAL)
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The advanced version of our Dynamic Weight Bearing Test for rodents (rats and mice) allows for faster paw identification, based on a video solution taking advantage of the most advanced algorithms of morphologic analysis, weight distribution and postural changes in dynamic conditions. An efficient and advanced alternative to traditional incapacitance tests (i.e. the paw pressure test or the force plate test) for assessing pain sensitivity in your research on analgesia, hyperalgesia and nociception involving rats and mice, including work on osteoarthritis, bone cancer, analgesic substances, Parkinson disease, allodynia...

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Developed in collaboration with Dr. Tighilet’s lab from Aix Marseille Université-CNRS, the Postural Module improves your DWB2, providing valuable endpoints for studies on pain, neurology, vestibular dysfunction, and neurodegenerative disorders.

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