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Published on: September 4, 2013
Anthocyanin effects on microglia M1/M2 phenotype: Consequence on neuronal fractalkine expression
Manuela Meireles1, Cláudia Marques1, Sónia Norberto1
1Department of Biochemistry, Faculty of Medicine, University of Porto, 4200-319 Porto, Portugal; CINTESIS-Center for Research in Health Technologies and Information Systems, Faculty of Medicine, University of Porto, 4200-319 Porto, Portugal.
Anthocyanins, found in berries, may offer neuroprotection by modulating microglial phenotype and reducing neuroinflammation. These flavonoids interact with microglia biology, potentially influencing microglia-neuron crosstalk for therapeutic benefit.
Area of Science:
- Neuroscience
- Immunology
- Pharmacology
Background:
- Microglia are key players in neuroinflammation, exhibiting diverse activation states.
- Modulating microglial phenotype and microglia-neuron crosstalk presents a potential neurotherapeutic strategy.
- Anthocyanins, berry-derived flavonoids, show promise for neuroprotection, but their effects on microglia are unclear.
Purpose of the Study:
- To investigate the impact of anthocyanins (cyanidin, cyanidin-3-glucose, methylated cyanidin-3-glucose) on microglial phenotype and microglia-neuron crosstalk.
- To assess anthocyanin effects on inflammatory markers and CX3CL1 expression in microglia and neuronal cell lines.
Main Methods:
- N9 microglia and SH-SY5Y neuronal cell lines were treated with anthocyanins under basal and stimulated (LPS/IL-4) conditions.
- Analysis included mRNA expression of inflammatory cytokines (TNF-α, IL-6, IL-1β) and CX3CL1.
- Conditioned media from treated microglia were used to assess effects on SH-SY5Y cells.
Main Results:
- Anthocyanins induced a less pro-inflammatory microglial profile at basal conditions.
- Cyanidin and methylated cyanidin-3-glucose decreased TNF-α mRNA expression.
- Cyanidin-3-glucose lowered LPS-induced IL-6 expression, while cyanidin reverted IL-1β expression.
- Cyanidin increased CX3CL1 mRNA expression in SH-SY5Y cells, suggesting modulation of microglia-neuron crosstalk.
Conclusions:
- Anthocyanins interact with microglia biology, attenuating the M1 pro-inflammatory phenotype.
- While not inducing a strict M2 phenotype, anthocyanins influenced microglia-neuron crosstalk by increasing neuronal CX3CL1 expression.
- These findings suggest potential for nutritional interventions targeting neuroinflammation and microglia-neuron communication.
