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Hydroxytyrosol Decreases LPS- and α-Synuclein-Induced Microglial Activation In Vitro
Marta Gallardo-Fernández1, Ruth Hornedo-Ortega2, Isabel M Alonso-Bellido3,4
1Departamento de Nutrición y Bromatología, Toxicología y Medicina Legal, Área de Nutrición y Bromatología, Facultad de Farmacia, Universidad de Sevilla, C/Profesor García González, 2, 41012 Sevilla, Spain.
Abstract:
Neuroinflammation is a common feature shared by neurodegenerative disorders, such as Parkinson's disease (PD), and seems to play a key role in their development and progression. Microglia cells, the principal orchestrators of neuroinflammation, can be polarized in different phenotypes, which means they are able to have anti-inflammatory, pro-inflammatory, or neurodegenerative effects. Increasing evidence supports that the traditional Mediterranean dietary pattern is related to the reduction of cognitive decline in neurodegenerative diseases. A considerable intake of plant foods, fish, and extra virgin olive oil (EVOO), as well as a moderate consumption of red wine, all characteristic of the Mediterranean diet (MD), are behind these effects. These foods are especially rich in polyphenols, being the most relevant in the MD hydroxytyrosol (HT) and their derivatives present in EVOO, which have demonstrated a wide array of biological activities. Here, we demonstrate that HT is able to reduce the inflammation induced by two different stimuli: lipopolysaccharide and α-synuclein. We also study the possible molecular mechanisms involved in the anti-inflammatory effect of HT, including the study of nuclear factor kappa B (NF-кB), mitogen-activated protein kinases (MAPKs), nicotinamide adenine dinucleotide phosphate (NADPH) oxidase, and inflammasome. Our data support the use of HT to prevent the inflammation associated with PD and shed light into the relationship between MD and this neurological disorder.
Insights
Hydroxytyrosol (HT), a polyphenol found in extra virgin olive oil, reduces neuroinflammation associated with Parkinson's disease (PD). This finding supports the Mediterranean diet's protective role in neurological disorders.
Area of Science:
- Neuroscience
- Immunology
- Nutritional Science
Background:
- Neuroinflammation is a key factor in neurodegenerative diseases like Parkinson's disease (PD).
- Microglia, the brain's immune cells, play a central role in neuroinflammation and can adopt various functional phenotypes.
- The Mediterranean diet (MD), rich in polyphenols like hydroxytyrosol (HT), is linked to reduced cognitive decline in neurodegenerative conditions.
Purpose of the Study:
- To investigate the anti-inflammatory effects of hydroxytyrosol (HT) on neuroinflammation.
- To explore the molecular mechanisms underlying HT's anti-inflammatory action in the context of PD.
- To elucidate the connection between the Mediterranean diet and neuroprotection.
Main Methods:
- Investigated HT's effect on inflammation induced by lipopolysaccharide and alpha-synuclein.
- Analyzed molecular pathways including NF-κB, MAPKs, NADPH oxidase, and inflammasome activation.
- Utilized cell-based models relevant to neuroinflammation and PD.
Main Results:
- Hydroxytyrosol (HT) demonstrated a significant reduction in inflammation triggered by both lipopolysaccharide and alpha-synuclein.
- HT modulated key inflammatory signaling pathways, including NF-κB and inflammasome activation.
- The study identified specific molecular targets for HT's anti-inflammatory effects relevant to PD.
Conclusions:
- Hydroxytyrosol (HT) possesses potent anti-inflammatory properties beneficial for mitigating neuroinflammation in Parkinson's disease.
- HT's mechanism involves the regulation of critical inflammatory signaling pathways.
- These findings highlight the therapeutic potential of HT and support the role of the Mediterranean diet in neurological health.
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