Acrolein contributes to TRPA1 up-regulation in peripheral and central sensory hypersensitivity following spinal cord injury

Jonghyuck Park, Lingxing Zheng, Glen Acosta, Sasha Vega-Alvarez, Zhe Chen, Breanne Muratori, Peng Cao, Riyi Shi

Research output: Contribution to journalArticlepeer-review

40 Scopus citations

Abstract

Acrolein, an endogenous aldehyde, has been shown to be involved in sensory hypersensitivity after rat spinal cord injury (SCI), for which the pathogenesis is unclear. Acrolein can directly activate a pro-algesic transient receptor protein ankyrin 1 (TRPA1) channel that exists in sensory neurons. Both acrolein and TRPA1 mRNA are elevated post SCI, which contributes to the activation of TRPA1 by acrolein and consequently, neuropathic pain. In the current study, we further showed that, post-SCI elevation of TRPA1 mRNA exists not only in dorsal root ganglias but also in both peripheral (paw skin) and central endings of primary afferent nerves (dorsal horn of spinal cord). This is the first indication that pain signaling can be over-amplified in the peripheral skin by elevated expressions of TRPA1 following SCI, in addition over-amplification previously seen in the spinal cord and dorsal root ganglia. Furthermore, we show that acrolein alone, in the absence of physical trauma, could lead to the elevation of TRPA1 mRNA at various locations when injected to the spinal cord. In addition, post-SCI elevation of TRPA1 mRNA could be mitigated using acrolein scavengers. Both of these attributes support the critical role of acrolein in elevating TRPA1 expression through gene regulation. Taken together, these data indicate that acrolein is likely a critical causal factor in heightening pain sensation post-SCI, through both the direct binding of TRPA1 receptor, and also by boosting the expression of TRPA1. Finally, our data also further support the notion that acrolein scavenging may be an effective therapeutic approach to alleviate neuropathic pain after SCI.

Original languageEnglish
Pages (from-to)987-997
Number of pages11
JournalJournal of Neurochemistry
Volume135
Issue number5
DOIs
StatePublished - Dec 1 2015

Bibliographical note

Publisher Copyright:
© 2015 International Society for Neurochemistry.

Keywords

  • aldehyde
  • hydralazine
  • hyperreflexia
  • lipid peroxidation
  • proalgesic

ASJC Scopus subject areas

  • Biochemistry
  • Cellular and Molecular Neuroscience

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