Journal
NUTRIENTS
Volume 15, Issue 2, Pages -Publisher
MDPI
DOI: 10.3390/nu15020449
Keywords
neurodegeneration; plant by-products; phenolic compounds; neuroprotection; oxidative stress; protein aggregation; neuroinflammation; mitochondrial dysfunction; AChE
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Neurodegenerative diseases are characterized by cell damage, impaired nervous system connections, and neuronal death, leading to the loss of essential motor and cognitive functions. Bioactive compounds, particularly phenolic compounds found in plant by-products, have shown promising neuroprotective effects and could be an optimal strategy for valorizing agricultural residues. This review summarizes the triggers of neurodegeneration, examines the role of plant extracts in neuroprotection, and discusses the potential neuroprotective effects of phenolic compounds.
Neurodegenerative diseases are known for their wide range of harmful conditions related to progressive cell damage, nervous system connections and neuronal death. These pathologies promote the loss of essential motor and cognitive functions, such as mobility, learning and sensation. Neurodegeneration affects millions of people worldwide, and no integral cure has been created yet. Here, bioactive compounds have been proven to exert numerous beneficial effects due to their remarkable bioactivity, so they could be considered as great options for the development of new neuroprotective strategies. Phenolic bioactives have been reported to be found in edible part of plants; however, over the last years, a large amount of research has focused on the phenolic richness that plant by-products possess, which sometimes even exceeds the content in the pulp. Thus, their possible application as an emergent neuroprotective technique could also be considered as an optimal strategy to revalorize these agricultural residues (those originated from plant processing). This review aims to summarize main triggers of neurodegeneration, revise the state of the art in plant extracts and their role in avoiding neurodegeneration and discuss how their main phenolic compounds could exert their neuroprotective effects. For this purpose, a diverse search of studies has been conducted, gathering a large number of papers where by-products were used as strong sources of phenolic compounds for their neuroprotective properties. Finally, although a lack of investigation is quite remarkable and greatly limits the use of these compounds, phenolics remain attractive for research into new multifactorial anti-neurodegenerative nutraceuticals.
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