Cannabidiol Exposure During Neuronal Differentiation Sensitizes Cells Against Redox-Active Neurotoxins
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Cannabidiol (CBD), one of the most abundant Cannabis sativa-derived compounds, has been implicated with neuroprotective effect in several human pathologies. Until now, no undesired side effects have been associated with CBD. In this study, we evaluated CBD’s neuroprotective effect in terminal differentiation (mature) and during neuronal differentiation (neuronal developmental toxicity model) of the human neuroblastoma SH-SY5Y cell line. A dose-response curve was performed to establish a sublethal dose of CBD with antioxidant activity (2.5 μM). In terminally differentiated SH-SY5Y cells, incubation with 2.5 μM CBD was unable to protect cells against the neurotoxic effect of glycolaldehyde, methylglyoxal, 6-hydroxydopamine, and hydrogen peroxide (H2O2). Moreover, no difference in antioxidant potential and neurite density was observed. When SH-SY5Y cells undergoing neuronal differentiation were exposed to CBD, no differences in antioxidant potential and neurite density were observed. However, CBD potentiated the neurotoxicity induced by all redox-active drugs tested. Our data indicate that 2.5 μM of CBD, the higher dose tolerated by differentiated SH-SY5Y neuronal cells, does not provide neuroprotection for terminally differentiated cells and shows, for the first time, that exposure of CBD during neuronal differentiation could sensitize immature cells to future challenges with neurotoxins.
KeywordsCannabidiol Neuroprotection Neurodevelopmental toxicity model SH-SY5Y cells Neurotoxicity Side effects
We thank MSc. Moema Queiroz Vieira from the Centro de Microscopia Eletronica (CME/UFRGS) for expert assistance with scanning electron microscopy (SEM). This work was supported by grants from the Brazilians agencies MCT/CNPq Universal (470306/2011-4), PRONEX/FAPERGS (1000274), PRONEM/FAPERGS (11/2032-5), PqG/FAPERGS (2414-2551/12-8), and MCT/CNPq INCT-TM (573671/2008-7).
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