Effects of Grape Skin Extract on Age-Related Mitochondrial Dysfunction, Memory and Life Span in C57BL/6J Mice
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Abstract
Dementia contributes substantially to the burden of disability experienced at old age, and mitochondrial dysfunction (MD) was identified as common final pathway in brain aging and Alzheimer’s disease. Due to its early appearance, MD is a promising target for nutritional prevention strategies and polyphenols as potential neurohormetic inducers may be strong neuroprotective candidates. This study aimed to investigate the effects of a polyphenol-rich grape skin extract (PGE) on age-related dysfunctions of brain mitochondria, memory, life span and potential hormetic pathways in C57BL/6J mice. PGE was administered at a dose of 200 mg/kg body weight/d in a 3-week short-term, 6-month long-term and life-long study. MD in the brains of aged mice (19–22 months old) compared to young mice (3 months old) was demonstrated by lower ATP levels and by impaired mitochondrial respiratory complex activity (except for mice treated with antioxidant-depleted food pellets). Long-term PGE feeding partly enhanced brain mitochondrial respiration with only minor beneficial effect on brain ATP levels and memory of aged mice. Life-long PGE feeding led to a transient but significant shift of survival curve toward higher survival rates but without effect on the overall survival. The moderate effects of PGE were associated with elevated SIRT1 but not SIRT3 mRNA expressions in brain and liver tissue. The beneficial effects of the grape extract may have been influenced by the profile of bioavailable polyphenols and the starting point of interventions.
Keywords
Brain aging Mitochondria Grape polyphenols Memory Life span HormesisNotes
Acknowledgments
The polyphenol-rich grape skin extract was kindly provided by Breko GmbH, Bremen, Germany, and was analyzed by the group of Prof. P. Winterhalter, Institute of Food Chemistry, Braunschweig University of Technology, Germany. This work was funded by the Alzheimer Forschung Initiative e.V. (Grant No. #14838).
Compliance with Ethical Standards
Conflicts of interest
The authors state that they have no conflict of interest.
Animal Rights
All animal studies were approved by the local authorities for animal welfare, and all experiments were carried out according to the European Communities Council Directive (86/609/EEC) by individuals with appropriate training.
Supplementary material
References
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