New role for spinal stargazin in α-amino-3-hydroxy-5-methyl-4- isoxazolepropionic acid receptor-mediated pain sensitization after inflammation

Feng Tao, John Skinner, Qingning Su, Roger A. Johns

Research output: Contribution to journalArticlepeer-review

Abstract

Considerable evidence has demonstrated that α-amino-3-hydroxy-5- methyl-4-isoxazolepropionic acid (AMPA) receptor blockade has an antinociceptive effect on inflammatory pain. Stargazin (STG) is the first transmembrane protein known to associate with AMPA receptors and regulate their synaptic targeting. However, it is not known whether STG is involved in inflammatory pain processing by regulating AMPA receptor function. In the present study, we investigated the effect of knockdown of spinal STG on AMPA receptor-mediated pain sensitization after inflammation. Antisense technology was employed to knock down STG expression in the spinal cord. We show that STG was expressed and interacted with AMPA receptor subunit GluR2 in the spinal cord. Intrathecally injected STG antisense oligodeoxyribonucleotide (ODN) specifically decreased STG expression in the lumbar spinal cord and dose dependently inhibited formalin-induced inflammatory pain in the second phase. More important was our finding for the first time that this specific STG antisense ODN diminished AMPA (0.1 μg)-enhanced formalin pain and lost its effect if pretreated with AMPA receptor antagonist CNQX. Our results demonstrate a new role for STG in central sensitization of inflammatory pain by interacting with AMPA receptors in the spinal cord.

Original languageEnglish (US)
Pages (from-to)867-873
Number of pages7
JournalJournal of neuroscience research
Volume84
Issue number4
DOIs
StatePublished - Sep 2006

Keywords

  • Antisense technology
  • Central sensitization
  • Formalin
  • Inflammatory pain
  • Knockdown

ASJC Scopus subject areas

  • Cellular and Molecular Neuroscience

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