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Protective effects of anthocyanins against brain ischemic damage

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Abstract

Anthocyanins are considered as bioactive components of plant-based diets that provide protection against ischemic cardiovascular pathologies by mechanisms dependent on their antioxidant and reductive capacities. However, it is not clear whether similar anthocyanin-mediated mechanisms can provide protection against ischemia-induced brain mitochondrial injury and cell death. In this study, we compared effects of three cyanidin-3-glycosides – glucoside (Cy3G), galactoside (Cy3Gal) and rutinoside (Cy3R), with pelargonxidin-3-glucoside (Pg3G) and found that at 10–20 μM concentrations they have no direct effect on respiratory functions of mitochondria isolated from normal or ischemia-damaged rat brain slices. However, intravenous injection of Cy3Gal and Cy3G (0,025 mg/kg or 0,05 mg/kg what matches 10 μM or 20 μM respectively) but not Cy3R in rats protected against ischemia-induced caspase activation and necrotic cell death, and reduced infarct size in cerebral cortex and cerebellum. These effects correlated with cytochrome c reducing capacity of cyanidin-3-glycosides. In contrast, intravenous injection of 0,025 mg/kg Pg3G which has the lowest cytochrome c reducing capacity among investigated anthocyanins, had no effect on ischemia-induced caspase activation and necrosis but reduced brain infarct size whereas intravenous injection of 0,05 mg/kg of Pg3G slightly promoted necrosis in the brain. Our data suggest that reductive rather than antioxidant capacities of anthocyanins may be important components in providing protection against ischemic brain damage.

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Data availability

The data that support the findings of this study are available from the corresponding author upon reasonable request.

Abbreviations

Cy3G:

cyanidin-3-glucoside, anthocyanin

Cy3Gal:

cyanidin-3-galactoside, anthocyanin

Cy3R:

cyanidin-3-rutinoside, anthocyanin

Pg3G:

pelargonidin-3-glucoside, anthocyanin

AA:

ascorbic acid

DHA:

dehydroascorbic acid

LDH:

lactate dehydrogenase

DEVD:

acetyl-Asp-Glu-Val-Asp-7-amido-4-methylcoumarin

TTC:

2,3,5,-triphenyltetrazolium chloride.

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Funding

This project has received funding from European Social Fund (project No 09.3.3-LMT-K-712-01-0131) under grant agreement with the Research Council of Lithuania (LMTLT).

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Contributions

Authors’ contributions: VB designed the research, ER carried out the procedures with animals. KP and KS performed the experiments. All authors analyzed data and contributed to the final version of the manuscript.

Corresponding author

Correspondence to Kristina Skemiene.

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All experimental procedures were reviewed and approved by the National Ethical Committee for Animal Care (Lisences No 0217 and No 0228) according to Directive 86/609/EEC. The rats were maintained and handled at Lithuanian University of Health Sciences animal house in agreement with the Guide for the Care and Use of Laboratory Rats.

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Not applicable.

Competing interests

The authors declare that they have no competing interests.

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Skemiene, K., Pampuscenko, K., Rekuviene, E. et al. Protective effects of anthocyanins against brain ischemic damage. J Bioenerg Biomembr 52, 71–82 (2020). https://doi.org/10.1007/s10863-020-09825-9

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  • DOI: https://doi.org/10.1007/s10863-020-09825-9

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