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Transcriptome Analysis Unveils That Exosomes Derived from M1-Polarized Microglia Induce Ferroptosis of Neuronal Cells
Abstract:
Microglia play a vital role in neurodegenerative diseases. However, the effects of microglia-derived exosomes on neuronal cells are poorly understood. This study aimed to explore the role of M1-polarized microglia exosomes in neuronal cells by transcriptome analysis. Exosomes isolated from resting M0-phenotype BV2 (M0-BV2) microglia and M1-polarized BV2 (M1-BV2) microglia were analyzed using high-throughput sequencing of the transcriptome. Differentially expressed genes (DEGs) between the two types of exosomes were identified by analyzing the sequencing data. The biological functions and pathways regulated by the identified DEGs were then identified using bioinformatics analyses. Finally, we evaluated the effects of exosomes on neuronal cells by coculturing M0-BV2 and M1-BV2 exosomes with primary neuronal cells. Enrichment analyses revealed that DEGs were significantly enriched in the ferroptosis pathway (p = 0.0137). M0-BV2 exosomes had no distinct effects on ferroptosis in neuronal cells, whereas M1-BV2 exosomes significantly reduced ferroptosis suppressor proteins (GPX4, SLC7A11, and FTH1) and elevated the levels of intracellular and mitochondrial ferrous iron and lipid peroxidation in neuronal cells. Polarized M1-BV2 microglia exosomes can induce ferroptosis in neuronal cells, thereby aggravating neuronal damage. Taken together, these findings enhance knowledge of the pathogenesis of neurological disorders and suggest potential therapeutic targets against neurodegenerative diseases.
Insights
M1-polarized microglia exosomes worsen neurodegeneration by inducing ferroptosis in neurons. These exosomes reduce protective proteins and increase iron, damaging brain cells and highlighting potential therapeutic targets for neurological disorders.
Area of Science:
- Neuroscience
- Cell Biology
- Molecular Biology
Background:
- Microglia are crucial immune cells in the central nervous system, implicated in neurodegenerative diseases.
- The specific impact of microglia-derived exosomes, particularly from M1-polarized states, on neuronal health remains largely unexplored.
- Understanding exosome-mediated communication is key to deciphering neuroinflammation and neuronal damage mechanisms.
Purpose of the Study:
- To investigate the role of M1-polarized microglia-derived exosomes in neuronal cells.
- To identify molecular pathways influenced by these exosomes using transcriptome analysis.
- To assess the direct effects of M1-polarized microglia exosomes on neuronal ferroptosis.
Main Methods:
- Isolation and transcriptome sequencing of exosomes from resting M0-BV2 and M1-BV2 microglia.
- Bioinformatic analysis of differentially expressed genes (DEGs) to identify regulated biological pathways.
- Co-culture experiments with primary neuronal cells to evaluate exosome-induced changes in ferroptosis.
Main Results:
- Transcriptome analysis revealed significant enrichment of DEGs in the ferroptosis pathway.
- Exosomes from M1-BV2 microglia, unlike M0-BV2 exosomes, significantly reduced ferroptosis suppressor proteins (GPX4, SLC7A11, FTH1) in neurons.
- M1-BV2 exosomes increased intracellular and mitochondrial iron levels and lipid peroxidation, indicating induced ferroptosis and neuronal damage.
Conclusions:
- M1-polarized microglia-derived exosomes actively induce ferroptosis in neuronal cells.
- This induction of ferroptosis exacerbates neuronal damage, contributing to the pathogenesis of neurodegenerative diseases.
- These findings offer insights into disease mechanisms and suggest potential therapeutic targets for neurodegenerative conditions.
