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      Changes in the expression of tetrodotoxin-sensitive sodium channels within dorsal root ganglia neurons in inflammatory pain.

      1 , , , ,
      Pain
      Elsevier BV

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          Abstract

          Nociceptive neurons within dorsal root ganglia (DRG) express multiple voltage-gated sodium channels, of which the tetrodotoxin-resistant (TTX-R) channel Na(v)1.8 has been suggested to play a major role in inflammatory pain. Previous work has shown that acute administration of inflammatory mediators, including prostaglandin E2 (PGE2), serotonin, and adenosine, modulates TTX-R current in DRG neurons, producing increased current amplitude and a hyperpolarizing shift of its activation curve. In addition, 4 days following injection of carrageenan into the hind paw, an established model of inflammatory pain, Na(v)1.8 mRNA and slowly-inactivating TTX-R current are increased in DRG neurons projecting to the affected paw. In the present study, the expression of sodium channels Na(v)1.1-Na(v)1.9 in small (< or = 25 micromdiameter) DRG neurons was examined with in situ hybridization, immunocytochemistry, Western blot and whole-cell patch-clamp methods following carrageenan injection into the peripheral projection fields of these cells. The results demonstrate that, following carrageenan injection, there is increased expression of TTX-S channels Na(v)1.3 and Na(v)1.7 and a parallel increase in TTX-S currents. The previously reported upregulation of Na(v)1.8 and slowly-inactivating TTX-R current is not accompanied by upregulation of mRNA or protein for Na(v)1.9, an additional TTX-R channel that is expressed in some DRG neurons. These observations demonstrate that chronic inflammation results in an upregulation in the expression of both TTX-S and TTX-R sodium channels, and suggest that TTX-S sodium channels may also contribute, at least in part, to pain associated with inflammation.

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          Author and article information

          Journal
          Pain
          Pain
          Elsevier BV
          0304-3959
          0304-3959
          Apr 2004
          : 108
          : 3
          Affiliations
          [1 ] Department of Neurology and Paralyzed Veterans of America, Eastern Paralyzed Veterans Association Neuroscience Research Center, Yale University School of Medicine, New Haven, CT 06510, USA Rehabilitation Research Center, VA Connecticut Healthcare System, 950 Campbell Ave, West Haven, CT, 06516 USA Department of Pharmacology and Toxicology, Stark Neurosciences Research Institute, Indiana University School of Medicine, Indianapolis, IN 46202, USA.
          Article
          00006396-200404000-00007
          10.1016/j.pain.2003.12.035
          15030943
          31409d36-4daf-4c9c-86ff-b106d7154a4a
          History

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