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Quercetin in brain diseases: Potential and limits.

Federico Dajas1, Juan Andrés Abin-Carriquiry1, Florencia Arredondo1

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Quercetin shows neuroprotective potential by modulating cell signaling and increasing antioxidant proteins. However, high concentrations can be toxic, and its effectiveness in vivo is debated, necessitating further research for therapeutic applications.

Keywords:
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Area of Science:

  • Neuroscience
  • Pharmacology
  • Biochemistry

Background:

  • Quercetin, a widespread flavonoid, is investigated for its role in preventing neurodegenerative and cerebrovascular diseases.
  • It enhances neuronal survival against oxidative stress and modulates cellular signaling pathways.
  • Its neuroprotective effects involve increasing antioxidant and pro-survival proteins and regulating inflammation.

Purpose of the Study:

  • To evaluate the neuroprotective potential of quercetin.
  • To understand the mechanisms underlying quercetin's effects on neuronal cells.
  • To assess the challenges and future directions for quercetin's therapeutic use in neurological conditions.

Main Methods:

  • Neuronal cell culture experiments to assess survival against oxidative insults.
  • Analysis of intracellular signaling pathways, kinase activity, and gene expression.
  • In vivo studies and bioavailability assessments in animal models.
  • Examination of quercetin's effects under varying oxidative conditions (normal vs. ischemic).

Main Results:

  • Quercetin increases neuronal survival and modulates signaling pathways, but high concentrations (>100 μM) induce cytotoxicity and apoptosis via autoxidation.
  • In vivo neuroprotection results are controversial, with low bioavailability and potential pro-oxidant effects in highly oxidative environments.
  • Metabolites may play a role in quercetin's activity, and chronic administration or specific delivery systems may be required for efficacy.

Conclusions:

  • Quercetin exhibits neuroprotective properties, particularly when consumed in natural food matrices, by re-establishing redox regulation and promoting survival signaling.
  • Its use as a free compound in acute treatments is limited by potential toxicity and controversial in vivo efficacy.
  • Further research is needed to develop pharmaceutical formulations or structural modifications to enhance quercetin's therapeutic window and efficacy for neurological disorders.