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Green tea's catechins demonstrate therapeutic effects against neurodegenerative diseases via anti-inflammatory, antioxidant actions, and activating diverse brain cellular pathways.
The research primarily evaluates the effect of polyphenolic compounds found in green tea, known as catechins, on neurodegenerative diseases. By conducting several interventional and observational studies on humans, the research explores the anti-cancer, anti-obesity, antidiabetic, anti-inflammatory, and neuroprotective properties of these compounds. The biological, pharmacological, antioxidant, and metal chelating abilities of catechins, particularly their influence on different cellular pathways within the brain, are intensively studied.
The results elucidate that catechins exhibit multiple neuroprotective effects. Their anti-inflammatory and antioxidant properties help to inhibit excessive production of cytokines, and inflammatory pathways, while also controlling metal ions and free radicals. Researchers have further established that catechins may curb the phosphorylation of the tau protein and aggregation of amyloid beta, both key markers in neurodegenerative diseases. Additionally, these compounds show potential in reducing alpha-synuclein levels and augmenting dopamine levels. Hence, they significantly contribute to the prevention and treatment of neurodegenerative diseases, including Alzheimer's, Parkinson's, multiple sclerosis, and cognitive deficits.
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Magnesium, essential for harmonising nerve signals and preserving the blood-brain barrier, may be linked to neurodegenerative disorders when its balance is disrupted.
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The researchers performed a narrative review, beginning with a quick overview of the role of magnesium in the brain. Magnesium is crucial for healthy nerve signal transmission and the upkeep of the blood-brain barrier, which protects the brain from harmful substances in the blood. Then, they discussed evidence suggesting a connection between disrupted magnesium balance and a variety of neurodegenerative disorders.
In the discussion of the results, it was posited that a deficiency in magnesium might contribute to low-grade systemic inflammation, which is common in many illnesses. Specifically, they argued that such inflammation in the brain is a characteristic feature of neurodegenerative diseases. The review found evidence that disruptions in the body's magnesium balance could be associated with multiple sclerosis, Alzheimer's, and Parkinson's diseases.
Bioactive components in green tea have demonstrated potential neuroprotective effects and might play a role in preventing Alzheimer’s disease.
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In this study, the researchers focused on the potential preventative effects of bioactive compounds, specifically (-)-epigallocatechin-3-gallate, present in tea, on Alzheimer's disease (AD). This interest was based on recognition of the importance of lifestyle-related factors, including diet, in the primary prevention of AD. They compiled and analyzed the findings from various preclinical studies which pointed towards the neuroprotective qualities of these compounds.
The results reveal an association between the consumption of green tea and a reduction in the risk of age-related cognitive decline and AD. However, these results do not establish a causal relationship. That is, while people who drink green tea appear to have lower rates of AD, the study cannot confirm that green tea consumption is the reason for this reduced prevalence. The researchers also emphasized that while the preventative effects of green tea were deduced from preclinical (animal) studies, human-based clinical trials yielded unsatisfactory evidence regarding tea's preventive or therapeutic effect on AD.
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The research leverages epidemiological studies, clinical trials, cell-based studies and animal tests to examine the effects of green tea, coffee, wine, and curry -- and their key polyphenols -- on human health. The polyphenols investigated include epigallocatechin gallate in green tea, chlorogenic acid in coffee, resveratrol in wine, and curcumin in curry. The study concentrates on the workings of these polyphenols, primarily focusing on reactive oxygen species (ROS), and how they perform both anti- and pro-oxidant functions, fundamentally influencing different enzymes and factors with health contributions.
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