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Published on: March 13, 2012
Wnt5a mediates chronic post-thoracotomy pain by regulating non-canonical pathways, nerve regeneration, and
1Department of Anesthesiology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China.
Abstract:
As well-characterized ligands involved in neurogenesis, Wnts are emerging as promising targets in pain pathogenesis. Our previous pilot study showed that intrathecal inhibition of Wnt5a, but not Wnts, relieves chronic post-thoracotomy pain (CPTP) in rats. In the present study, we aimed to further explore the regulatory mechanism of Wnt5a in CPTP development. Increased protein levels of Wnt5a, transmembrane receptor Ror2, and activated non-canonical Wnt pathway members were found in the thoracic dorsal root ganglions from postoperative day (POD) 7 to POD 21. However, the levels of canonical Wnt pathway members showed no change by reverse transcriptase-PCR. In addition, elevated nerve regeneration, activated pro-inflammatory factors, and glial cells were detected from POD 7 to POD 21. Furthermore, intrathecal Wnt5a blockade during the early phase (POD 0 to POD 9) significantly increased the pain threshold, and intervention in the late phase (POD 14 to POD 16) alleviated pain; however, the analgesic response was not as effective as that in the early phase. Additionally, early but not late Wnt5a blockade significantly reversed CPTP-induced activation of the non-canonical Wnt pathways, nerve regeneration, and inflammation. In contrast, a Wnt5a agonist decreased the pain threshold in both naïve and painless rats. These results suggest that Wnt5a promotes the development of CPTP by activating non-canonical Wnt pathways, nerve regeneration, and inflammation. Therapeutic intervention by targeting Wnt5a may represent an effective strategy for preventing and treating CPTP.
Insights
Wnt5a signaling drives chronic post-thoracotomy pain (CPTP) by activating non-canonical pathways, nerve regeneration, and inflammation. Early Wnt5a blockade effectively prevents and treats CPTP, suggesting it as a therapeutic target.
Area of Science:
- Neuroscience
- Pain Research
- Molecular Biology
Background:
- Wnt signaling pathways are implicated in neurogenesis and pain pathogenesis.
- Previous studies indicated Wnt5a, but not other Wnts, alleviates chronic post-thoracotomy pain (CPTP) in rats.
- The precise regulatory mechanism of Wnt5a in CPTP development requires further investigation.
Purpose of the Study:
- To elucidate the regulatory mechanism of Wnt5a in the development of CPTP.
- To investigate the role of Wnt5a in non-canonical Wnt pathway activation, nerve regeneration, and inflammation in CPTP.
- To evaluate the therapeutic potential of targeting Wnt5a for CPTP prevention and treatment.
Main Methods:
- Analysis of Wnt5a, Ror2, and Wnt pathway member levels in dorsal root ganglions post-surgery.
- Assessment of nerve regeneration, pro-inflammatory factors, and glial cell activation.
- Intrathecal administration of Wnt5a inhibitors or agonists at different time points (early vs. late phase) in a rat CPTP model.
Main Results:
- Increased Wnt5a and Ror2 protein levels, alongside activated non-canonical Wnt pathway members, were observed from postoperative day 7 to 21.
- Early Wnt5a blockade significantly enhanced pain threshold and reversed CPTP-induced changes; late blockade had a lesser effect.
- Wnt5a activation promoted nerve regeneration and inflammation, while its blockade attenuated these effects and reduced pain.
Conclusions:
- Wnt5a promotes CPTP development by activating non-canonical Wnt pathways, nerve regeneration, and inflammation.
- Early-phase therapeutic intervention targeting Wnt5a demonstrates significant analgesic effects and reverses pathological changes.
- Targeting Wnt5a represents a promising strategy for the prevention and treatment of chronic post-thoracotomy pain.
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