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Author Spotlight: In Vitro Co-Culture Model for Studying Microglia-Neuronal Interactions in Disease Conditions
Published on: July 26, 2024
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Microglial polarization differentially affects neuronal vulnerability to the β-amyloid protein: Modulation by
Sara Merlo1, Grazia Ilaria Caruso1, Laura Bonfili2
1Department of Biomedical and Biotechnological Sciences, Section of Pharmacology, University of Catania, Via Santa Sofia 97, 95123 Catania, Italy.
Biochemical Pharmacology
|June 24, 2022
Summary
Melatonin (MEL) reduces inflammation in Alzheimer's disease (AD) by modulating microglial cells. This neuroprotective effect involves restoring proteasome function and benefits neuronal cells challenged by beta-amyloid (Aβ42).
Area of Science:
- Neuroscience
- Immunology
- Pharmacology
Background:
- Microglial cells are implicated in Alzheimer's disease (AD) neuroinflammation, but their precise role is debated.
- Beta-amyloid (Aβ42) peptide is a key factor in AD pathogenesis, triggering microglial activation and neuroinflammation.
- Melatonin (MEL) is a hormone with known anti-inflammatory and antioxidant properties.
Purpose of the Study:
- To investigate how melatonin modulates microglial cell activation induced by Aβ42.
- To examine the effects of melatonin on microglial-neuronal cell cross-talk in an AD context.
- To explore the underlying mechanisms of melatonin's neuroprotective actions.
Main Methods:
- Human microglial HMC3 cells were treated with Aβ42 and melatonin (added concurrently or post-treatment).
- Neuronal-like SH-SY5Y cells were exposed to Aβ42 or conditioned media from treated microglia.
- Assays included measuring inflammatory markers, protein expression (SIRT1, BDNF, synaptophysin, VAMP2), caspase-1 activity, ERK phosphorylation, proteasome activity, and neuritic length.
Main Results:
- Melatonin promoted an anti-inflammatory microglial phenotype, preserving SIRT1 and BDNF expression.
- Melatonin prevented caspase-1 upregulation and phospho-ERK induction, and partially restored proteasome function.
- Conditioned media from melatonin-treated microglia protected neuronal cells from Aβ42-induced synaptic protein loss and neuritic shortening.
Conclusions:
- Melatonin exhibits significant anti-inflammatory effects on microglia, even after pro-inflammatory activation.
- Melatonin's neuroprotective actions involve modulating microglial proteasome function and enhancing neuronal resilience.
- These findings highlight melatonin as a potential therapeutic agent for Alzheimer's disease.
