Abstract
Rationale
AKB48 and its fluorinate derivate 5F-AKB48 are two novel synthetic cannabinoids belonging to a structural class with an indazole core structure. They are marketed as incense, herbal preparations or chemical supply for their psychoactive Cannabis-like effects.
Objectives
The present study was aimed at investigating the in vitro and in vivo pharmacological activity of AKB48 and 5F-AKB48 in male CD-1 mice and comparing their in vivo effects with those caused by the administration of Δ9-THC and JWH-018.
Results
In vitro competition binding experiments performed on mouse and human CB1 and CB2 receptors revealed a nanomolar affinity and potency of the AKB48 and 5F-AKB48. In vivo studies showed that AKB48 and 5F-AKB48, induced hypothermia, increased pain threshold to both noxious mechanical and thermal stimuli, caused catalepsy, reduced motor activity, impaired sensorimotor responses (visual, acoustic and tactile), caused seizures, myoclonia, hyperreflexia and promoted aggressiveness in mice. Moreover, microdialysis study in freely moving mice showed that systemic administration of AKB48 and 5F-AKB48 stimulated dopamine release in the nucleus accumbens. Behavioural, neurological and neurochemical effects were fully prevented by the selective CB1 receptor antagonist/inverse agonist AM 251.
Conclusions
For the first time, the present study demonstrates the overall pharmacological effects induced by the administration of AKB48 and 5F-AKB48 in mice and suggests that the fluorination can increase the power and/or effectiveness of SCBs. Furthermore, this study outlines the potential detrimental effects of SCBs on human health.
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Abbreviations
- AM 251:
-
1-(2,4-Dichlorophenyl)-5-(4-iodophenyl)-4-methyl-N-(piperidin-1-yl)-1H-pyrazole-3-carboxamide
- AKB48:
-
N-(1-Adamantyl)-1-pentyl-1H-indazole-3-carboxamide
- DA:
-
Dopamine
- NAc shell:
-
Nucleus accumbens shell
- Δ9-THC:
-
(−)-Δ9-THC or Dronabinol®
- JWH-018:
-
Naphthalen-1-yl-(1-pentylindol-3-yl)methanone
- 5F-AKB48:
-
N-(1-Adamantyl)-1-(5-fluoropentyl)-1H-indazole-3- carboxamide
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Acknowledgments
This research has been funded by the Drug Policies Department, Presidency of the Council of Ministers, Italy (project NS-Drugs to M. Marti) and by local funds from the University of Ferrara to M. Marti. All applicable international, national and/or institutional guidelines for the care and use of animals were followed. All procedures performed in the studies involving animals were in accordance with the ethical standards of the institution or practice at which the studies were conducted.
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Isabella Canazza and Andrea Ossato are equally contributed to this work.
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Canazza, I., Ossato, A., Trapella, C. et al. Effect of the novel synthetic cannabinoids AKB48 and 5F-AKB48 on “tetrad”, sensorimotor, neurological and neurochemical responses in mice. In vitro and in vivo pharmacological studies. Psychopharmacology 233, 3685–3709 (2016). https://doi.org/10.1007/s00213-016-4402-y
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DOI: https://doi.org/10.1007/s00213-016-4402-y