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Activation of the P2X
Pengtao Li1, Quan Zhang2,3, Zhi Xiao2,3
11 Graduate School, Zunyi Medical University, Zunyi, Guizhou, China.
Molecular Pain
|September 11, 2018
Summary
Tramadol relieves bone cancer pain in rats by upregulating P2X7 receptors in the periaqueductal gray. Blocking these receptors partially reversed tramadol's analgesic effects, confirming their role.
Area of Science:
- Neuroscience
- Pharmacology
- Oncology
Background:
- Cancer pain is a significant challenge in advanced cancer, with current treatments often insufficient.
- P2X7 receptors in the central nervous system are implicated in pain signaling.
- Tramadol is a widely used analgesic for cancer pain.
Purpose of the Study:
- To investigate the role of P2X7 receptors in the ventrolateral periaqueductal gray (vlPAG) in tramadol's analgesic effects on bone cancer pain in rats.
Main Methods:
- A rat model of bone cancer pain was established.
- Analgesic effects of tramadol were evaluated using mechanical and thermal pain tests.
- P2X7 receptor expression in the vlPAG was assessed via immunohistochemistry and Western blot.
- The effect of a P2X7 receptor antagonist (A-740003) on tramadol's efficacy was examined.
Main Results:
- Bone cancer pain in rats showed mildly elevated P2X7 receptor expression in the vlPAG.
- Tramadol dose-dependently reduced pain behaviors and increased P2X7 receptor expression in the vlPAG.
- Pretreatment with the P2X7 antagonist A-740003 partially blocked tramadol's pain-relieving effects.
Conclusions:
- Tramadol exerts its analgesic effect on bone cancer pain by upregulating P2X7 receptor expression in the vlPAG.
- P2X7 receptors in the vlPAG are crucial for mediating tramadol's pain relief in this model.
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