Abstract
Background
Nicotine addiction continues to be a health challenge across the world. Despite several approved medications, smokers continue to relapse. Several human and animal studies have evaluated the role of the endogenous opioid system as a potential target for smoking cessation medications.
Methods
In this review, studies that have elucidated the role of the mu (MORs), delta (DORs), and kappa (KORs) opioid receptors in nicotine reward, nicotine withdrawal, and reinstatement of nicotine seeking will be discussed. Additionally, the review will discuss discrepancies in the literature and therapeutic potential of the endogenous opioid system, and suggest studies to address gaps in knowledge with respect to the role of the opioid receptors in nicotine dependence.
Results
Data available till date suggest that blockade of the MORs and DORs decreased the rewarding effects of nicotine, while activation of the MORs and DORs decreased nicotine withdrawal-induced aversive effects. In contrast, activation of the KORs decreased the rewarding effects of nicotine, while blockade of the KORs decreased nicotine withdrawal-induced aversive effects. Interestingly, blockade of the MORs and KORs attenuated reinstatement of nicotine seeking. In humans, MOR antagonists have shown benefits in select subpopulations of smokers and further investigation is required to realize their full therapeutic potential.
Conclusion
Future work must assess the influence of polymorphisms in opioid receptor-linked genes in nicotine dependence, which will help in both identifying individuals vulnerable to nicotine addiction and the development of opioid-based smoking cessation medications. Overall, the endogenous opioid system continues to be a promising target for future smoking cessation medications.
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Abbreviations
- AMPA:
-
Amino-3-hydroxy-5-methyl-4-isoxazolepropionate/kainate
- CPP:
-
Conditioned place preference
- CPA:
-
Conditioned place version
- DAMGO:
-
[D-Ala2,N-Me-Phe4,Gly-ol5]-enkephalin
- DORs:
-
Delta opioid receptors
- GNTI:
-
Guanidinonaltrindole
- ICSS:
-
Intracranial self-stimulation
- KORs:
-
Kappa opioid receptors
- MK-801:
-
(5R,10S)-(−)-5-Methyl-10,11-dihydro-5H-dibenzo[a,d]cylcohepten-5,10-imine
- MORs:
-
Mu opioid receptors
- NAcc:
-
Nucleus accumbens
- NMDA:
-
N-methyl-D-aspartate
- VTA:
-
Ventral tegmental area
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Acknowledgements
This work was supported by a New Investigator grant from the American Association of Colleges of Pharmacy to Dr. Manoranjan S. D’Souza. This article is dedicated to the memory of Dr. Athina Markou, an excellent researcher and a wonderful mentor, who continues to inspire all of her mentees and the scientific community even though she is no more with us.
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Norman, H., D’Souza, M.S. Endogenous opioid system: a promising target for future smoking cessation medications. Psychopharmacology 234, 1371–1394 (2017). https://doi.org/10.1007/s00213-017-4582-0
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DOI: https://doi.org/10.1007/s00213-017-4582-0