Abstract
Recent studies have shown that probucol (PB), a hipocholesterolemic agent with antioxidant and anti-inflammatory properties, presents neuroprotective properties. On the other hand, adverse effects have limited PB’s clinical application. Thus, the search for PB derivatives with no or less adverse effects has been a topic of research. In this study, we present a novel organoselenium PB derivative (RC513) and investigate its potential protective activity in an in vitro experimental model of oxidative toxicity induced by tert-butyl hydroperoxide (tBuOOH) in HT22 neuronal cells, as well as exploit potential protective mechanisms. tBuOOH exposure caused a significant decrease in the cell viability, which was preceded by (i) increased reactive species generation and (ii) decreased mitochondrial maximum oxygen consumption rate. RC513 pretreatment (48 h) significantly prevented the tBuOOH-induced decrease of cell viability, RS generation, and mitochondrial dysfunction. Of note, RC513 significantly increased glutathione peroxidase (GPx) activity and mRNA expression of GPx1, a key enzyme involved in peroxide detoxification. The use of mercaptosuccinic acid, an inhibitor of GPx, significantly decreased the protective activity of RC513 against tBuOOH-induced cytotoxicity in HT22 cells, highlighting the importance of GPx upregulation in the observed protection. In summary, the results showed a significant protective activity of a novel PB derivative against tBuOOH-induced oxidative stress and mitochondrial dysfunction, which was related to the upregulation of GPx. Our results point to RC513 as a promising neuroprotective molecule, even though studies concerning potential beneficial effects and safety aspects of RC513 under in vivo conditions are well warranted.
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Abbreviations
- PB:
-
Probucol
- GPx:
-
Glutathione peroxidase
- SH:
-
Glutathione
- GR:
-
Glutathione reductase
- NADPH:
-
β-Nicotinamide adenine dinucleotide phosphate sodium salt reduced
- DMSO:
-
Dimethyl sulfoxide
- MTT:
-
3-(4,5-Dimethylthiazol- 2-yl)-2,5-diphenyltetrazolium bromide
- PI:
-
Propidium iodide
- DCFH2-DA:
-
2′,7′-Dichlorofluorescein diacetate
- tBuOOH:
-
tert-Butyl hydroperoxide
- MS:
-
Mercaptosuccinic acid
- DTNB:
-
5,5′-Dithiobis(2-nitrobenzoic acid)
- FCCP:
-
Carbonyl cyanide 4-(trifluoromethoxy) phenylhydrazone
- DMEM:
-
Dulbecco’s modified Eagle’s medium
- FBS:
-
Fetal bovine serum
- HBSS:
-
Hank’s balanced salt solution
- NPSH:
-
Non-protein thiols
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Acknowledgements
The financial support by (i) Fundação de Apoio à Pesquisa do Estado de Santa Catarina (FAPESC), (ii) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), and (iii) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) is gratefully acknowledged. MF, AFB, and ALB are CNPq fellowship recipients. Part of the work was performed with the support from LAMEB (Laboratório Multiusuário de Ciências Biológicas—UFSC), whose technicians are gratefully acknowledged. The authors are also thankful to CEBIME-UFSC for mass analyses.
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Fig. S1
Antioxidant activity of RC513. RC513 (25 μM) or trolox (positive control) were incubated with the stable radical DPPH (500 μM) during 30 min at room temperature. Expressed results as percentage of antioxidant activity. Values are represented as mean ± SEM (n = 3). ** indicates statistical difference (p < 0.01) by Student’s t-test. (GIF 24 kb)
Table S1
Temporal expression of Tr2 (thioredoxin reductase 2) gene in RC513-treated HT22 cells. HT22 cells were treated with 2 μM RC513 or vehicle during 3 h, 6 h, 12 h and 24 h. Transcripts levels of Tr2 were normalized with Gapdh gene and calculated by the 2-ΔΔCT method. Values are represented as mean ± SEM (n = 4) (PDF 160 kb)
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Quispe, R.L., Canto, R.F.S., Jaramillo, M.L. et al. Design, Synthesis, and In Vitro Evaluation of a Novel Probucol Derivative: Protective Activity in Neuronal Cells Through GPx Upregulation. Mol Neurobiol 55, 7619–7634 (2018). https://doi.org/10.1007/s12035-018-0939-6
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DOI: https://doi.org/10.1007/s12035-018-0939-6