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EphrinBs/EphBs signaling is involved in modulation of spinal nociceptive processing through a mitogen-activated

Jia-Ping Ruan1, Hong-Xing Zhang, Xian-Fu Lu

  • 1Jiangsu Key Laboratory of Anesthesiology, Xuzhou Medical College, Xuzhou, China.

Anesthesiology
|April 17, 2010
PubMed
Abstract

Insights

Mitogen-activated protein kinases (MAPKs) activation contributes to spinal pain signaling involving EphrinB/EphB pathways. Inhibiting MAPKs or EphB receptors alleviates pain behaviors and spinal cord activation.

Area of Science:

  • Neuroscience
  • Pain Research
  • Molecular Biology

Background:

  • EphB receptors and ephrinB ligands modulate spinal nociceptive information.
  • Downstream mechanisms of this modulation are not fully understood.
  • Investigating the role of mitogen-activated protein kinases (MAPKs) in this process.

Purpose of the Study:

  • To investigate the role of MAPKs as downstream effectors in spinal nociceptive information modulation by ephrinB/EphB signaling.
  • To elucidate the mechanisms by which MAPKs influence pain signaling pathways.

Main Methods:

  • Assessed thermal hyperalgesia and mechanical allodynia using radiant heat and von Frey filaments.
  • Utilized immunofluorescence staining to detect p-MAPKs, neuronal nuclei, and glial fibrillary acidic protein.
  • Employed immunohistochemistry for c-Fos expression and Western blot assay for p-MAPKs.
  • Administered intrathecal injections of ephrinB1-Fc, EphB1-Fc, MAPK inhibitors, and MK-801.

Main Results:

  • Intrathecal ephrinB1-Fc induced dose- and time-dependent hyperalgesia, increased spinal p-MAPKs and c-Fos expression.
  • p-MAPKs colocalized with neuronal and astrocyte markers in the spinal cord.
  • MAPK inhibition reversed pain behaviors and c-Fos expression induced by ephrinB1-Fc.
  • EphB receptor inhibition reduced inflammation and neuropathic pain, decreasing spinal p-MAPKs and c-Fos.
  • NMDA receptor antagonist MK-801 prevented ephrinB1-Fc-induced hyperalgesia and spinal MAPK activation.

Conclusions:

  • MAPK activation plays a significant role in modulating spinal nociceptive information mediated by ephrinB/EphB signaling.
  • These findings highlight MAPKs as key players in the downstream signaling pathways of EphB receptors and ephrinB ligands in pain modulation.

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