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[cAMP response-element binding protein participates in the phosphorylated extracellular signal-regulate kinase

Xue-Song Song1, Yan-Bing Xu, Jun-Li Cao

  • 1Department of Anesthesiology, First Clinical College of N. Bethune Centre Health Sciences, Jilin University, Changchun 130021, China.

Sheng Li Xue Bao : [Acta Physiologica Sinica]
|April 15, 2005
PubMed

Insights

Extracellular signal-regulated kinase (ERK) activation is crucial for neuropathic pain development following nerve injury. Inhibiting ERK signaling reduces pain hypersensitivity by decreasing phosphorylated cAMP response-element binding protein (pCREB) expression.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Pain Research

Context:

  • Neuropathic pain, often resulting from nerve injury like chronic constriction injury (CCI), involves complex signaling pathways.
  • Extracellular signal-regulated kinase (ERK) is implicated in processing nociceptive information and central sensitization.
  • The interplay between ERK and cAMP response-element binding protein (CREB) in neuropathic pain remains underexplored.

Purpose:

  • To investigate the role of ERK activation in regulating phosphorylated CREB (pCREB) expression in the context of chronic neuropathic pain.
  • To examine the therapeutic potential of inhibiting ERK signaling on pain behaviors and molecular markers in a rat CCI model.

Summary:

  • Chronic constriction injury (CCI) in rats induced mechanical and thermal hyperalgesia.
  • Intrathecal administration of a MEK inhibitor (U0126) or ERK antisense oligonucleotides significantly attenuated CCI-induced pain hypersensitivity.
  • These treatments also suppressed the increased expression of pCREB and c-Fos, key markers of neuronal activation, in the spinal cord.

Impact:

  • The findings suggest that CREB is a critical downstream mediator in the ERK-dependent pathway contributing to neuropathic pain.
  • Targeting the ERK/pCREB signaling pathway presents a potential therapeutic strategy for managing neuropathic pain.
  • This study elucidates a key molecular mechanism underlying nerve injury-induced pain.

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