Abstract
Endocannabinoid system plays an important role in the regulation of diverse physiological functions. Although cannabinoid type 2 receptors (CB2) are involved in the modulation of immune system in peripheral tissues, recent findings demonstrated that they are also expressed in the central nervous system and could constitute a new target for the treatment of neurodegenerative disorders. At present, very little is known about the potential effects of CB2-mimetic drugs on neuronal cells. This study aimed to examine whether JWH-133, a selective CB2 receptor agonist, affects the survival of SH-SY5Y neuroblastoma cell line, a widely used experimental in vitro model to study mechanisms of toxicity and protection in nigral dopaminergic neurons. Cell viability was assessed using two complementary methods: MTT test measuring mitochondrial activity and LDHe test indicating disruption of cell membrane integrity. In addition, cell proliferation was measured using BrdU incorporation assay. JWH-133 (10–40 μM) induced a concentration-dependent decrease of SH-SY5Y cell viability and proliferation rate. Using AM-630, a reverse agonist of CB2 receptors, as well as Z-VAD-FMK, a pan-caspase inhibitor, we demonstrated that the cytotoxic effect of JWH-133 presumably was not mediated by activation of CB2 receptors or by caspase pathway. Results of this work suggest that agonists of CB2 receptors when administered in multiple/high doses may induce neuronal damage.
Abbreviations
- AM-630:
-
6-Iodo-2-methyl-1-[2-(4-morpholinyl)ethyl]-1H-indol-3-yl](4-methoxyphenyl)methanone
- BrdU:
-
5-Bromo-2′-deoxyuridine
- CB2 :
-
Cannabinoid type 2 receptor
- JWH-133:
-
(6aR,10aR)-3-(1,1-dimethylbutyl)-6a,7,10,10a-tetrahydro-6,6,9-trimethyl-6H-dibenzo[b,d]pyran
- LDH:
-
Lactate dehydrogenase
- MTT:
-
3-(4,5-Dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide
- Z-VAD-FMK:
-
Benzyloxy carbonyl-Val-Ala-Asp(OMe)-fluoromethylketone
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Acknowledgments
Supported by grants from the National Science Centre (NCN), Cracow, Poland (2014/13/8/B/NZ7/02237) and Medical University of Lodz, Lodz, Poland (503/3-011-01/503-31-002).
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Wojcieszak, J., Krzemień, W. & Zawilska, J.B. JWH-133, a Selective Cannabinoid CB2 Receptor Agonist, Exerts Toxic Effects on Neuroblastoma SH-SY5Y Cells. J Mol Neurosci 58, 441–445 (2016). https://doi.org/10.1007/s12031-016-0726-7
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DOI: https://doi.org/10.1007/s12031-016-0726-7