Abstract
Experimental evidence has shown that probucol, a hypocholesterolemic agent, is also able to increase glutathione peroxidase (GPx) activity. However, there is a lack of knowledge about the mechanism(s) involved in this event. In this study, in vitro experiments with purified GPx1 from bovine erythrocytes and cultured SH-SY5Y neuroblastoma cells, as well as in silico studies with GPx1, were performed in order to elucidate mechanisms mediating the stimulatory effect of probucol on GPx activity and to investigate the relevance of this event in terms of susceptibility against peroxide-induced cytotoxicity. In vitro experiments with purified GPx1 showed a direct stimulatory effect of probucol on the activity of GPx1, which was related to an increase in Vmax with no changes in KM. Probucol also increased GPx activity in cultured SH-SY5Y neuroblastoma cells, while the levels of GPx1 expression were not changed, corroborating the results found with the purified enzyme. In addition, probucol rendered SH-SY5Y cells more resistant to hydroperoxide-induced cytotoxicity, and this event was abolished in GPx1 knocked-down cells. In silico studies with GPx1 pointed to a potential binding site for probucol at the close vicinity of the GSH pocket. Collectively, the results presented herein indicate that GPx1 plays a central role in the probucol-induced protective effects against peroxide toxicity. This highlights a novel target (GPx1) and a new mechanism of action (direct activation) for an “old drug.” The relevance of such results for in vivo conditions deserves further investigation.
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Abbreviations
- CuOOH:
-
Cumene hydroperoxide
- DCFH-DA:
-
2′,7′-Dichlorodihydrofluorescein diacetate
- DMSO:
-
Dimethyl sulfoxide
- GPx:
-
Glutathione peroxidase
- GR:
-
Glutathione reductase
- GSH:
-
Glutathione
- HEPES:
-
4-(2-Hydroxyethyl)-1-piperazineethanesulfonic acid
- MTT:
-
3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide
- Na2SeO3 :
-
Sodium selenite
- PB:
-
Probucol
- ROS:
-
Reactive oxygen species
- tBuOOH:
-
tert-Butyl hydroperoxide
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Funding
The financial supports by the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) are gratefully acknowledged. We are also grateful to the Laboratório Multiusuário de Estudos em Biologia at the Universidade Federal de Santa Catarina (LAMEB/UFSC) for providing its infrastructure for carrying out biochemical analysis.
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Highlights
•Probucol increased GPx1 Vmax in in vitro conditions with purified enzyme.
•Probucol increased GPx activity in cultured SH-SY5Y cells without changing GPx1 protein levels.
•Probucol-treated SH-SY5Y cells were more resistant to hydroperoxide toxicity.
•Probucol’s protective effect against hydroperoxide toxicity is abolished in GPx1 knocked-down cells.
Electronic Supplementary Material
Supplemental Figure 1
Effect of probucol on the immunoreactivity of GPx1 in human neuroblastoma cells. Cells were pretreated for 6 days with probucol (PB, 3 or 10 μM), sodium selenite (Na2SeO3, positive control, 30 nM) or vehicle. Representative microscopic images of GPx-1 in SH-SY5Y evaluated by immunoreactivity (scale bar = 200 μm). Left panels = GPx1 antibody; Central panels = nuclei stain; Right panels = merge (TIF 1467 kb)
Supplemental Figure 2
Standardization of the transfection assay. Cells were transfected with 3 siRNA targets for GPx1, negative control (scrambled) and transfection control (TYE ™ 563 DS). The photographs were performed at 24 h, 3 and 6 days after transfection with siRNA positive and negative controls (TIF 1678 kb)
Supplemental Figure 3
Messenger RNA expression, GPx1 activity and GPx1 immunoreactivity (Western Blot). After the transfection assays (see Materials and Methods; GPx1 knockdown, initial standardization), GPx1 mRNA expression (A), activity (B) and protein levels (C and D) were determined. Cells were collected at 36 h (mRNA expression) or at 72 h (enzyme activity and Western Blot) after transfection. Fig. D is a representative Western Blot image of Fig. C data. Data (A-C) are mean ± S.E.M. expressed as percentages of control cells (transfected with scrambled) n = 4. * indicate significant (p < 0.05) differences compared to control by one-way ANOVA, followed by Tukey’s post hoc test. (TIFF 93 kb)
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Santos, D.B., Colle, D., Moreira, E.L.G. et al. Probucol Protects Neuronal Cells Against Peroxide-Induced Damage and Directly Activates Glutathione Peroxidase-1. Mol Neurobiol 57, 3245–3257 (2020). https://doi.org/10.1007/s12035-020-01963-w
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DOI: https://doi.org/10.1007/s12035-020-01963-w