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Modulating the inflammatory properties of activated microglia with Docosahexaenoic acid and Aspirin
Lauren K Pettit1, Christopher Varsanyi, James Tadros
1Kean University, 1000 Morris Avenue, Union, NJ 07083, USA.
Background:
Microglia are considered the "resident macrophages" of the brain. When in their resting state, microglia perform routine maintenance and immune surveillance. Once activated, either by injury or an immune stimulus, microglia secrete a variety of pro-inflammatory molecules, such as Nitric Oxide, superoxide, and inflammatory cytokines. Up-regulation of pro-inflammatory molecules is transient, and does not cause neurodegeneration. However, if up-regulation lasts for an extended period of time, neurodegeneration ensues.Many neurodegenerative diseases are characterized by chronic inflammation due to microglial activation. Non-Steroidal Anti-Inflammatory Drugs (NSAIDs) have been proposed as possible preventative treatments for neurodegenerative diseases, due to their anti-inflammatory properties. Docosahexaenoic Acid (DHA) is an omega-3 polyunsaturated fatty acid (PUFA) that has potent anti-inflammatory properties.This research work sought to elucidate whether microglial activation can be modulated by combining Aspirin, a classical NSAID, with Docosahexaenoic Acid, a natural anti-inflammatory agent. The combined ability of Aspirin and DHA to modulate microglial activation was determined in the context of pro-inflammatory cytokines, Nitric Oxide levels, as well as total Glutathione levels.
Results:
Docosahexaenoic Acid increased total Glutathione levels in microglia cells and enhanced their anti-oxidative capacity. It reduced production of the pro-inflammatory cytokines TNF-α and IL-6 induced through TLR-3 and TLR-4 activation. Furthermore, it reduced production of Nitric Oxide. Aspirin showed similar anti-inflammatory effects with respect to TNF-α during TLR-3 and TLR-7 stimulation. Aspirin did not show any redection in terms of Nitric Oxide production. Combination of Aspirin and Docosahexaenoic Acid showed augmentation in total Glutathione production during TLR-7 stimulation as well as a reduction in IL-6, TNF-α and Nitric Oxide.
Conclusions:
Collectively, these findings highlight the combination of Docosahexaenoic Acid and Aspirin as a possible measure against inflammation of the nervous system, thus leading to protection against neurodegenerative diseases with an inflammatory etiology.
Insights
Combining Aspirin and Docosahexaenoic Acid (DHA) reduces neuroinflammation by modulating microglial activation. This combination enhances antioxidant capacity and lowers pro-inflammatory markers, offering potential protection against neurodegenerative diseases.
Area of Science:
- Neuroscience
- Immunology
- Pharmacology
Background:
- Microglia, the brain's resident macrophages, play a dual role in immune surveillance and inflammatory responses.
- Chronic microglial activation contributes to neurodegeneration in various neurological diseases.
- Non-Steroidal Anti-Inflammatory Drugs (NSAIDs) and Docosahexaenoic Acid (DHA) possess anti-inflammatory properties.
Purpose of the Study:
- To investigate the combined effect of Aspirin (an NSAID) and DHA (an omega-3 fatty acid) on microglial activation.
- To determine the impact of this combination on pro-inflammatory cytokines, Nitric Oxide, and Glutathione levels.
Main Methods:
- Microglial cell cultures were stimulated via Toll-like receptors (TLRs) to induce activation.
- Assays were performed to measure levels of pro-inflammatory cytokines (TNF-α, IL-6), Nitric Oxide, and total Glutathione.
- The effects of DHA, Aspirin, and their combination were evaluated.
Main Results:
- DHA alone increased Glutathione, reduced Nitric Oxide, TNF-α, and IL-6 production.
- Aspirin alone reduced TNF-α but did not affect Nitric Oxide levels.
- The combination of Aspirin and DHA demonstrated synergistic effects, augmenting Glutathione and reducing TNF-α, IL-6, and Nitric Oxide.
Conclusions:
- The combination of DHA and Aspirin shows significant potential in mitigating neuroinflammation.
- This synergistic approach may offer a novel therapeutic strategy for neurodegenerative diseases with inflammatory components.
