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Published on: March 16, 2016
Capsaicin consumption reduces brain amyloid-beta generation and attenuates Alzheimer's disease-type pathology and
Jun Wang1, Bin-Lu Sun2, Yang Xiang3
1Department of Neurology and Center for Clinical Neuroscience, Daping Hospital, Third Military Medical University, 400042, Chongqing, China. qywangjun@163.com.
Abstract:
Alzheimer's disease (AD) is the most common cause of age-related dementia and is currently incurable. The failures of current clinical trials and the establishment of modifiable risk factors have shifted the AD intervention from treatment to prevention in the at-risk population. Previous studies suggest that there is a geographic overlap between AD incidence and spicy food consumption. We previously reported that capsaicin-rich diet consumption was associated with better cognition and lower serum Amyloid-beta (Aβ) levels in people aged 40 years and over. In the present study, we found that intake of capsaicin, the pungent ingredient in chili peppers, reduced brain Aβ burden and rescued cognitive decline in APP/PS1 mice. Our in vivo and in vitro studies revealed that capsaicin shifted Amyloid precursor protein (APP) processing towards α-cleavage and precluded Aβ generation by promoting the maturation of a disintegrin and metalloproteinase 10 (ADAM10). We also found that capsaicin alleviated other AD-type pathologies, such as tau hyperphosphorylation, neuroinflammation and neurodegeneration. The present study suggests that capsaicin is a potential therapeutic candidate for AD and warrants clinical trials on chili peppers or capsaicin as dietary supplementation for the prevention and treatment of AD.
Insights
Capsaicin, found in chili peppers, may help prevent Alzheimer's disease (AD) by reducing brain amyloid-beta and improving cognition. Further clinical trials are recommended for capsaicin as a dietary supplement for AD prevention and treatment.
Area of Science:
- Neuroscience
- Pharmacology
- Nutritional Science
Background:
- Alzheimer's disease (AD) is a leading cause of dementia with no cure.
- Focus is shifting towards prevention due to modifiable risk factors and trial failures.
- Previous research links spicy food consumption to lower AD incidence and better cognition.
Purpose of the Study:
- To investigate the therapeutic potential of capsaicin in Alzheimer's disease.
- To determine capsaicin's effect on amyloid-beta (Aβ) burden and cognitive decline in a mouse model.
- To elucidate the molecular mechanisms underlying capsaicin's action on AD pathologies.
Main Methods:
- Utilized APP/PS1 mouse model for in vivo studies.
- Conducted in vitro experiments to analyze molecular pathways.
- Assessed Aβ levels, cognitive function, tau phosphorylation, neuroinflammation, and neurodegeneration.
Main Results:
- Capsaicin intake reduced brain Aβ burden and rescued cognitive decline in mice.
- Capsaicin promoted APP α-cleavage via ADAM10 maturation, reducing Aβ generation.
- Capsaicin alleviated tau hyperphosphorylation, neuroinflammation, and neurodegeneration.
Conclusions:
- Capsaicin demonstrates potential as a therapeutic agent for Alzheimer's disease.
- Dietary supplementation with capsaicin warrants clinical investigation for AD prevention and treatment.
- Capsaicin targets multiple AD pathologies, suggesting a broad therapeutic effect.
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