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α-Mangostin Inhibits α-Synuclein-Induced Microglial Neuroinflammation and Neurotoxicity
Zhaoyang Hu1, Wei Wang2, Jing Ling3
1Hangzhou Cancer Institute, Hangzhou Cancer Hospital, Hangzhou, 310007, Zhejiang, China.
Abstract:
Microglia-mediated neuroinflammation induced by α-synuclein in the substantianigra likely either initiates or aggravates nigral neuro degeneration in Parkinson's disease (PD). We aimed to explore the effects of α-mangostin (α-M), a polyphenolicxanthone derivative from mangosteen on α-synuclein-stimulated DA neurodegeneration. Primary microglia, mesencephalic neuron, mesencephalic neuron-glianeuronal cultures, and transwell co-cultures were prepared separately. Liquid scintillation counting was used to determine the radioactivity in DA uptake. Enzyme-linked immunosorbent assay (ELISA) was performed in the IL-1β, IL-6, and TNF-α assay. The expression of proteins was analyzed by Western blot. α-M inhibited the increased levels of pro-inflammatory cytokines, NO, and ROS in α-synuclein-stimulated primary microglia. Mechanistic study revealed that α-M functioned by inhibition of nuclear factor kappa B (NF-κB) and NADPH oxidase. Further, α-M protected α-synuclein-induced microglial and direct neurotoxicity. Although detailed mechanisms remain to be defined, our observations suggest a potential compound, which inhibits microglial activation induced by α-synuclein by targeting NADPH oxidase, might be a therapeutic possibility in preventing PD progression.
Insights
Alpha-mangostin (α-M) reduces neuroinflammation in Parkinson's disease models by inhibiting microglial activation. This compound shows potential for preventing Parkinson's disease progression by targeting key inflammatory pathways.
Area of Science:
- Neuroscience
- Pharmacology
- Immunology
Background:
- Microglia-driven neuroinflammation from alpha-synuclein aggregation is implicated in Parkinson's disease (PD) pathogenesis.
- Alpha-synuclein accumulation in the substantia nigra contributes to neurodegeneration in PD.
Purpose of the Study:
- To investigate the neuroprotective effects of alpha-mangostin (α-M) on alpha-synuclein-induced neurodegeneration.
- To explore the mechanisms by which α-M modulates microglial activation and neuroinflammation.
Main Methods:
- Primary microglia and mesencephalic neuronal cultures were utilized.
- Assays included liquid scintillation counting for dopamine uptake, ELISA for cytokines (IL-1β, IL-6, TNF-α), and Western blot for protein expression.
- Investigated the role of NF-κB and NADPH oxidase pathways.
Main Results:
- α-M significantly inhibited pro-inflammatory cytokines, nitric oxide (NO), and reactive oxygen species (ROS) in alpha-synuclein-stimulated microglia.
- α-M demonstrated neuroprotection against alpha-synuclein-induced microglial and direct neuronal toxicity.
- Mechanistic studies indicated that α-M inhibits the NF-κB and NADPH oxidase pathways.
Conclusions:
- Alpha-mangostin exhibits anti-inflammatory and neuroprotective properties against alpha-synuclein toxicity.
- Targeting microglial activation via NADPH oxidase inhibition presents a potential therapeutic strategy for Parkinson's disease.
- Further research is warranted to fully elucidate the therapeutic potential of α-M in PD.
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