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Essential Oil Constituents as Anti-Inflammatory and Neuroprotective Agents: An Insight through Microglia Modulation
Nikola M Stojanović1, Pavle J Ranđelović1, Maja Simonović2,3
1Department of Physiology, Faculty of Medicine, University of Niš, 18000 Niš, Serbia.
Abstract:
Microglia are key players in the brain's innate immune response, contributing to homeostatic and reparative functions but also to inflammatory and underlying mechanisms of neurodegeneration. Targeting microglia and modulating their function may have therapeutic potential for mitigating neuroinflammation and neurodegeneration. The anti-inflammatory properties of essential oils suggest that some of their components may be useful in regulating microglial function and microglial-associated neuroinflammation. This study, starting from the ethnopharmacological premises of the therapeutic benefits of aromatic plants, assessed the evidence for the essential oil modulation of microglia, investigating their potential pharmacological mechanisms. Current knowledge of the phytoconstituents, safety of essential oil components, and anti-inflammatory and potential neuroprotective effects were reviewed. This review encompasses essential oils of Thymus spp., Artemisia spp., Ziziphora clinopodioides, Valeriana jatamansi, Acorus spp., and others as well as some of their components including 1,8-cineole, β-caryophyllene, β-patchoulene, carvacrol, β-ionone, eugenol, geraniol, menthol, linalool, thymol, α-asarone, and α-thujone. Essential oils that target PPAR/PI3K-Akt/MAPK signalling pathways could supplement other approaches to modulate microglial-associated inflammation to treat neurodegenerative diseases, particularly in cases where reactive microglia play a part in the pathophysiological mechanisms underlying neurodegeneration.
Insights
Essential oils show potential for modulating microglia, the brain's immune cells, to combat neuroinflammation and neurodegeneration. Their components may offer therapeutic benefits for treating brain diseases linked to inflammatory processes.
Area of Science:
- Neuroimmunology
- Pharmacology
- Neurodegenerative Diseases
Background:
- Microglia are central to brain immunity, involved in both health and disease, including neuroinflammation and neurodegeneration.
- Modulating microglial activity presents a therapeutic strategy for neuroinflammatory and neurodegenerative conditions.
- Essential oils possess anti-inflammatory properties, suggesting their components could regulate microglial function.
Purpose of the Study:
- To review the evidence for essential oil modulation of microglia.
- To investigate the pharmacological mechanisms underlying these effects.
- To assess the potential of essential oils and their constituents in treating neuroinflammation and neurodegeneration.
Main Methods:
- Systematic review of ethnopharmacological data and scientific literature.
- Analysis of phytoconstituents, safety profiles, and anti-inflammatory/neuroprotective effects of essential oils.
- Examination of signaling pathways, including PPAR/PI3K-Akt/MAPK, involved in microglial modulation.
Main Results:
- Several essential oils (e.g., *Thymus* spp., *Artemisia* spp.) and their components (e.g., 1,8-cineole, carvacrol, thymol) demonstrate microglial modulating properties.
- Key compounds interact with signaling pathways crucial for inflammatory responses in microglia.
- Evidence supports the anti-inflammatory and potential neuroprotective roles of these natural compounds.
Conclusions:
- Essential oils and their constituents offer a promising avenue for therapeutic intervention in neuroinflammation and neurodegeneration.
- Targeting microglial pathways with essential oil components could complement existing treatments for diseases involving reactive microglia.
- Further research into safety and efficacy is warranted for clinical application.
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