Characterization of acid-sensing ion channels in dorsal horn neurons of rat spinal cord

Long Jun Wu, Bo Duan, Yi De Mei, Jun Gao, Jian Guo Chen, Min Zhuo, Lin Xu, Mian Wu, Tian Le Xu

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Abstract

Acid-sensing ion channels (ASICs) are ligand-gated cation channels activated by extracellular protons. In periphery, they contribute to sensory transmission, including that of nociception and pain. Here we characterized ASIC-like currents in dorsal horn neurons of the rat spinal cord and their functional modulation in pathological conditions. Reverse transcriptase-nested PCR and Western, blotting showed that three ASIC isoforms, ASIC1a, ASIC2a, and ASIC2b, are expressed at a high level in dorsal horn neurons. Electrophysiological and pharmacological properties of the proton-gated currents suggest that homomeric ASIC1a and/or heteromeric ASIC1a + 2b channels are responsible for the proton-induced currents in the majority of dorsal horn neurons. Acidification-induced action potentials in these neurons were compatible in a pH-dependent manner with the pH dependence of ASIC-like current. Furthermore, peripheral complete Freund's adjuvant-induced inflammation resulted in increased expression of both ASIC1a and ASIC2a in dorsal horn. These results support the idea that the ASICs of dorsal horn neurons participate in central sensory transmission/modulation under physiological conditions and may play important roles in inflammation-related persistent pain.

Original languageEnglish (US)
Pages (from-to)43716-43724
Number of pages9
JournalJournal of Biological Chemistry
Volume279
Issue number42
DOIs
StatePublished - Oct 15 2004

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ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Cite this

Wu, L. J., Duan, B., Mei, Y. D., Gao, J., Chen, J. G., Zhuo, M., Xu, L., Wu, M., & Xu, T. L. (2004). Characterization of acid-sensing ion channels in dorsal horn neurons of rat spinal cord. Journal of Biological Chemistry, 279(42), 43716-43724. https://doi.org/10.1074/jbc.M403557200