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[ROLE PHOSPHOINOSITID SIGNALING PATHWAY IN OPIOIDS CONTROL OF P2X3 RECEPTORS IN THE PRIMARY SENSORY NEURONS]
Opioid receptor activation in primary pain-sensing neurons has dual effects on P2X3 receptors. These opposing actions, involving the PLC pathway, may explain how opioids shift from pain relief to pain enhancement.
Area of Science:
- Neuroscience
- Pain research
- Molecular pharmacology
Background:
- Homomeric P2X3 receptors in primary nociceptive neurons are key in pain signal generation.
- The opioid system modulates pain signaling in both the central and peripheral nervous systems.
Purpose of the Study:
- To investigate the effects of opioids on P2X3 receptors in dorsal root ganglion (DRG) neurons.
- To elucidate the signaling pathways mediating opioid actions on P2X3 receptor currents.
Main Methods:
- Patch clamp electrophysiology was used to record P2X3 receptor-mediated currents in DRG neurons.
- Neurons were treated with Leu-enkephalin (Leu), pertussis toxin (PT), and a PLC inhibitor (U-73122).
Main Results:
- Leu-enkephalin (Leu) exhibited dual effects on P2X3 currents: inhibition at 1 µM.
- Pretreatment with pertussis toxin (PT) reversed Leu's effect, causing facilitation of P2X3 currents.
- The PLC inhibitor U-73122 abolished both the facilitating and inhibitory effects of Leu.
Conclusions:
- Opioid receptor agonists induce opposing effects on P2X3 receptors in rat DRG neurons.
- Both opioid-induced effects are mediated via the phospholipase C (PLC) signaling pathway.
- These findings suggest a molecular mechanism for the transition between opioid analgesia and hyperalgesia.
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