Abstract
Here, we describe a molecular switch associated with opioid receptors-linked signalling cascades that provides a dual opioid control over P2X3 purinoceptor in sensory neurones. Leu-enkephalin inhibited P2X3-mediated currents with IC50 ~10 nM in ~25 % of small nociceptive rat dorsal root ganglion (DRG) neurones. In contrast, in neurones pretreated with pertussis toxin leu-enkephalin produced stable and significant increase of P2X3 currents. All effects of opioid were abolished by selective μ-opioid receptor antagonist D-Phe-Cys-Tyr-D-Trp-Orn-Thr-Pen-Thr-NH2 (CTOP), nonselective inhibitor naloxone, and by PLC inhibitor U73122. Thus, we discovered a dual link between purinoceptors and μ-opioid receptors: the latter exert both inhibitory (pertussis toxin-sensitive) and stimulatory (pertussis toxin-insensitive) actions on P2X3 receptors through phospholipase C (PLC)-dependent pathways. This dual opioid control of P2X3 receptors may provide a molecular explanation for dichotomy of opioid therapy. Pharmacological control of this newly identified facilitation/inhibition switch may open new perspectives for the adequate medical use of opioids, the most powerful pain-killing agents known today.
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Abbreviations
- AC:
-
adenylate cyclase
- [Ca2+]i :
-
free cytosolic Ca2+ concentration
- cAMP:
-
cyclic adenosine monophosphate
- DRG:
-
dorsal root ganglion
- CTOP:
-
D-Phe-Cys-Tyr-D-Trp-Orn-Thr-Pen-Thr-NH2
- DAG:
-
diacylglycerol
- Enk:
-
leu-enkephalin
- GPCRs:
-
G protein-coupled receptors
- InsP3 :
-
inositol 1,4,5-trisphosphate
- meATP:
-
α,β–methylene-ATP
- MORs:
-
μ-opioid receptors
- PKA:
-
protein kinase A
- PKC:
-
protein kinase C
- PLC:
-
phospholipase C
- PTX:
-
pertussis toxin
- TRPV1:
-
transient receptor potential vanilloid 1
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Acknowledgments
This work was supported by Ukrainian Fund for Fundamental Studies (grant DFFD F46.2/001) and by NIH (grant NIH 1R03TW008228-01A1).
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The authors declare no conflict of interest.
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Chizhmakov, I., Kulyk, V., Khasabova, I. et al. Molecular mechanism for opioid dichotomy: bidirectional effect of μ-opioid receptors on P2X3 receptor currents in rat sensory neurones. Purinergic Signalling 11, 171–181 (2015). https://doi.org/10.1007/s11302-015-9443-x
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DOI: https://doi.org/10.1007/s11302-015-9443-x