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Molecular Medicine

, Volume 21, Issue 1, pp 544–552 | Cite as

Virus-Mediated Knockdown of Nav1.3 in Dorsal Root Ganglia of STZ-Induced Diabetic Rats Alleviates Tactile Allodynia

  • Andrew M. Tan
  • Omar A. Samad
  • Sulayman D. Dib-Hajj
  • Stephen G. Waxman
Research Article

Abstract

Diabetic neuropathic pain affects a substantial number of people and represents a major public health problem. Available clinical treatments for diabetic neuropathic pain remain only partially effective and many of these treatments carry the burden of side effects or the risk of dependence. The misexpression of sodium channels within nociceptive neurons contributes to abnormal electrical activity associated with neuropathic pain. Voltage-gated sodium channel Nav1.3 produces tetrodotoxin-sensitive sodium currents with rapid repriming kinetics and has been shown to contribute to neuronal hyperexcitability and ectopic firing in injured neurons. Suppression of Nav1.3 activity can attenuate neuropathic pain induced by peripheral nerve injury. Previous studies have shown that expression of Nav1.3 is upregulated in dorsal root ganglion (DRG) neurons of diabetic rats that exhibit neuropathic pain. Here, we hypothesized that viral-mediated knockdown of Nav1.3 in painful diabetic neuropathy would reduce neuropathic pain. We used a validated recombinant adeno-associated virus (AAV)-shRNA-Nav1.3 vector to knockdown expression of Nav1.3, via a clinically applicable intrathecal injection method. Three weeks following vector administration, we observed a significant rate of transduction in DRGs of diabetic rats that concomitantly reduced neuronal excitability of dorsal horn neurons and reduced behavioral evidence of tactile allodynia. Taken together, these findings offer a novel gene therapy approach for addressing chronic diabetic neuropathic pain.

Notes

Acknowledgments

This work was supported by grants from the Nancy Taylor Foundation and the Department of Veterans Affairs (VA) Medical Research Service and Rehabilitation Research Service. AM Tan and OA Samad are funded by the Nancy Taylor Foundation. AM Tan is funded by grants from the PVA Research Foundation and the US Department of Veterans Affairs (1 IK2 RX001123-01A2). The Center for Neuroscience and Regeneration Research is a Collaboration of the Paralyzed Veterans of America with Yale University. We thank Pamela Zwinger, Shujun Liu, and Peng Zhao for their excellent technical assistance.

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Authors and Affiliations

  • Andrew M. Tan
    • 1
    • 2
  • Omar A. Samad
    • 1
    • 2
  • Sulayman D. Dib-Hajj
    • 1
    • 2
  • Stephen G. Waxman
    • 1
    • 2
  1. 1.Department of NeurologyYale University School of MedicineNew HavenUSA
  2. 2.The Center for Neuroscience and Regeneration Research, Department of Neurology, Veterans Affairs Connecticut Healthcare SystemYale UniversityWest HavenUSA

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