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Carnosic Acid Pretreatment Attenuates Mitochondrial Dysfunction in SH-SY5Y Cells in an Experimental Model of Glutamate-Induced Excitotoxicity

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Abstract

Mitochondria are the major site of adenosine triphosphate (ATP) production in mammalian cells. Moreover, mitochondria produce most of the reactive oxygen species (ROS) in nucleated cells. Redox and bioenergetic abnormalities have been seen in mitochondria during the onset and progression of neurodegenerative diseases. In that context, excitotoxicity induced by glutamate (GLU) plays an important role in mediating neurotoxicity. Several drugs have been used in the treatment of diseases involving excitotoxicity. Nonetheless, some patients (20–30%) present drug resistance. Thus, it is necessary to find chemicals able to attenuate mitochondrial dysfunction in the case of excitotoxicity. In this work, we treated the human neuroblastoma SH-SY5Y cell line with the diterpene carnosic acid (CA) at 1 μM for 12 h prior to the exposure to GLU for further 24 h. We found that CA prevented the GLU-induced mitochondrion-related redox impairment and bioenergetic decline in SH-SY5Y cells. CA also downregulated the pro-apoptotic stimulus elicited by GLU in this experimental model. CA exerted mitochondrial protection by a mechanism associated with the transcription factor nuclear factor erythroid 2–related factor 2 (Nrf2), since silencing of this protein with small interfering RNA (siRNA) suppressed the CA-induced protective effects. Future directions include investigating whether CA would be able to modulate mitochondrial function and/or dynamics in in vivo experimental models of excitotoxicity.

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Funding

This work was supported by CNPq (Edital Universal 2016). This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) (Brazil) Finance Code 001 (ALC receives a CAPES Fellow (Bolsa de Mestrado)).

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Correspondence to Marcos Roberto de Oliveira.

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Figure S1

The effects of a pretreatment with CA at 1 μM for 12 h on Bax immunocontent (A), cytosolic cytochrome c content (B), mitochondrial cytochrome c content (C), caspase-9 activity (D), and caspase-3 activity (E) in SH-SY5Y cells exposed to glutamate (GLU) at 80 mM for further 24 h. The results are presented as the mean ± S.E.M. of three or five independent experiments each done in triplicate. One-way ANOVA followed by the post hoc Tukey’s test, * p < 0.05 vs control cells; # p < 0.05 vs GLU-treated cells. (PDF 90 kb)

Figure S2

The effects of CA at 1 μM for different periods on the activity of the transcription factor Nrf2. The results are presented as the mean ± S.E.M. of three or five independent experiments each done in triplicate. One-way ANOVA followed by the post hoc Tukey’s test, * p < 0.05 vs control cells. (PDF 4 kb)

Figure S3

The effects of Nrf2 siRNA (48 h) on the activity of the transcription factor Nrf2 in SH-SY5Y cells exposed to CA for 1 h. The results are presented as the mean ± S.E.M. of three or five independent experiments each done in triplicate. One-way ANOVA followed by the post hoc Tukey’s test, * p < 0.05 vs control cells; # p < 0.05 vs CA-treated cells transfected with negative control (NC) siRNA. (PDF 5 kb)

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de Oliveira, M.R., Duarte, A.R., Chenet, A.L. et al. Carnosic Acid Pretreatment Attenuates Mitochondrial Dysfunction in SH-SY5Y Cells in an Experimental Model of Glutamate-Induced Excitotoxicity. Neurotox Res 36, 551–562 (2019). https://doi.org/10.1007/s12640-019-00044-8

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  • DOI: https://doi.org/10.1007/s12640-019-00044-8

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