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Phytochemicals in Neuroprotection

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Bioactives and Nutraceuticals".

Deadline for manuscript submissions: closed (28 July 2023) | Viewed by 5475

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Guest Editor
School of Science, STEM College, RMIT University, 124 La Trobe Street, Melbourne, VIC 3001, Australia
Interests: medicinal chemistry phytochemical; natural and synthetic molecules; mechanisms to defeat dementia; Alzheimer’s disease; brain-gut axis; dietary directions against dementia; lifestyle modifications
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Special Issue Information

Dear Colleagues,

The brain and body are living laboratories of biosynthesis, metabolism, and catabolism, whereby aging laboratories require increased maintenance to sustain homeostasis and optimal function. Chemistry permeates life and nature, but nature is the best chemist; therefore, a class of molecules that treats multiple age-related diseases would have a major impact on global healthy aging and economics. Phytochemicals and related natural products abundant in foods, beverages and herbs are arguably the most promising family of preventative and protective compounds to alleviate symptoms of multiple diseases or disabilities of human aging. Since human health benefits are influenced by lifestyles, the dietary intake and body–brain interactions of phytochemicals that are abundant in fruits, berries, vegetables, herbs, and beverages are a resource that can provide opportunities for intervention and protection strategies against Alzheimer’s and other neurodegenerative diseases. The science of the molecular mechanisms and metabolic processes of phytochemical consumption occurring in the body and brain can direct, determine and provide new strategies of how to optimize and select constituents that may sustainably provide generic benefits for neurons to defend against insults.

This Special Issue provides insights into the molecular episodes of phytochemicals that can be used to unlock their full translational biochemical health potential for human needs. This also affords an intellectual framework and platform for the design/discovery of more potent products that could potentially become available and be directed towards providing health-sustaining interventions against aging brain diseases.

This Special Issue concerns and revolves around the science and impact of phytochemicals on aging and lifestyles. Some examples include:

  1. Aging: Aging and tea consumption and risk of dementia
  2. Diet: For example, the effect of the MIND diet of obese persons on cognition; chocolate and better health; the effect of berry-based supplements and foods on cognitive function; fruits and vegetables high in polyphenolics can prevent and even reverse age-related cognitive deficits
  3. Exercise: Physical activity and fruit, vegetable consumption, decreases risk of depression by 80%; clustering recapitulates the stimulating effects of exercise on hippocampal cell genesis and memory; exercise training improves memory
  4. Neuroprotection: Effects of phytochemical protection on the body and brain; the mitophagy modulator polyphenols kaempferol and rhapontigenin improve neuroprotection.

Dr. Helmut M. Hugel
Guest Editor

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Keywords

  • dietary phytochemicals
  • fruits & vegetables
  • therapeutic efficacy
  • neurodegenerative disorders
  • neuroprotection
  • cognition enhancing
  • microbial metabolites
  • signaling pathways
  • autophagy
  • vascular pathology
  • biomolecular mechanisms

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Published Papers (2 papers)

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22 pages, 4286 KiB  
Article
Screening of the Anti-Neurodegenerative Activity of Caffeic Acid after Introduction into Inorganic Metal Delivery Systems to Increase Its Solubility as the Result of a Mechanosynthetic Approach
by Anna Stasiłowicz-Krzemień, Natalia Rosiak, Andrzej Miklaszewski and Judyta Cielecka-Piontek
Int. J. Mol. Sci. 2023, 24(11), 9218; https://doi.org/10.3390/ijms24119218 - 24 May 2023
Cited by 3 | Viewed by 1528
Abstract
The proven anti-neurodegenerative properties of caffeic acid in vivo are limited due to its poor solubility, which limits bioavailability. Therefore, caffeic acid delivery systems have been developed to improve caffeic acid solubility. Solid dispersions of caffeic acid and magnesium aluminometasilicate (Neusilin US2—Neu) were [...] Read more.
The proven anti-neurodegenerative properties of caffeic acid in vivo are limited due to its poor solubility, which limits bioavailability. Therefore, caffeic acid delivery systems have been developed to improve caffeic acid solubility. Solid dispersions of caffeic acid and magnesium aluminometasilicate (Neusilin US2—Neu) were prepared using the ball milling and freeze-drying techniques. The solid dispersions of caffeic acid:Neu obtained by ball milling in a 1:1 mass ratio turned out to be the most effective. The identity of the studied system in comparison to the physical mixture was confirmed using the X-Ray Powder Diffractionand Fourier-transform infrared spectroscopy techniques. For caffeic acid with improved solubility, screening tests were carried out to assess its anti-neurodegenerative effect. The obtained results on the inhibition of acetylcholinesterase, butyrylcholinesterase, tyrosinase, and antioxidant potential provide evidence for improvement of caffeic acid’s anti-neurodegenerative activity. As a result of in silico studies, we estimated which caffeic acid domains were involved in interactions with enzymes showing expression relevant to the neuroprotective activity. Importantly, the confirmed improvement in permeability of the soluble version of caffeic acid through membranes simulating the walls of the gastrointestinal tract and blood-brain barrier further strengthen the credibility of the results of in vivo anti-neurodegenerative screening tests. Full article
(This article belongs to the Special Issue Phytochemicals in Neuroprotection)
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32 pages, 1179 KiB  
Review
Flavonols in Action: Targeting Oxidative Stress and Neuroinflammation in Major Depressive Disorder
by Maja Jazvinšćak Jembrek, Nada Oršolić, Dalibor Karlović and Vjekoslav Peitl
Int. J. Mol. Sci. 2023, 24(8), 6888; https://doi.org/10.3390/ijms24086888 - 7 Apr 2023
Cited by 9 | Viewed by 3050
Abstract
Major depressive disorder is one of the most common mental illnesses that highly impairs quality of life. Pharmacological interventions are mainly focused on altered monoamine neurotransmission, which is considered the primary event underlying the disease’s etiology. However, many other neuropathological mechanisms that contribute [...] Read more.
Major depressive disorder is one of the most common mental illnesses that highly impairs quality of life. Pharmacological interventions are mainly focused on altered monoamine neurotransmission, which is considered the primary event underlying the disease’s etiology. However, many other neuropathological mechanisms that contribute to the disease’s progression and clinical symptoms have been identified. These include oxidative stress, neuroinflammation, hippocampal atrophy, reduced synaptic plasticity and neurogenesis, the depletion of neurotrophic factors, and the dysfunction of the hypothalamic–pituitary–adrenal (HPA) axis. Current therapeutic options are often unsatisfactory and associated with adverse effects. This review highlights the most relevant findings concerning the role of flavonols, a ubiquitous class of flavonoids in the human diet, as potential antidepressant agents. In general, flavonols are considered to be both an effective and safe therapeutic option in the management of depression, which is largely based on their prominent antioxidative and anti-inflammatory effects. Moreover, preclinical studies have provided evidence that they are capable of restoring the neuroendocrine control of the HPA axis, promoting neurogenesis, and alleviating depressive-like behavior. Although these findings are promising, they are still far from being implemented in clinical practice. Hence, further studies are needed to more comprehensively evaluate the potential of flavonols with respect to the improvement of clinical signs of depression. Full article
(This article belongs to the Special Issue Phytochemicals in Neuroprotection)
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