Integrating Bulk and Single-Cell Transcriptomic Data to Identify Ferroptosis-Associated Inflammatory Gene in...

Area of Science:

• Neuroscience
• Immunology
• Genetics

Background:

• Ferroptosis, an iron-dependent cell death, is implicated in various diseases but its role in Alzheimer's disease (AD) neuroinflammation and the brain-peripheral axis is unclear.
• Understanding the molecular links between ferroptosis, immune responses, and AD pathogenesis is crucial for developing effective treatments.

Purpose of the Study:

• To investigate the cellular and molecular mechanisms connecting ferroptosis, immune inflammation, and the brain-peripheral blood axis in Alzheimer's disease.
• To identify novel candidate genes and pathways involved in AD pathogenesis using integrated multi-omics data.

Main Methods:

• Integrated bulk and single-cell RNA sequencing (RNA-seq) from AD brain and peripheral blood.
• Differential gene expression analysis, weighted gene co-expression network analysis (WGCNA), and cell-type-specific analysis.
• Validation of candidate genes in ferroptosis models using RT-qPCR and immunofluorescence.

Main Results:

• SLC11A1, an inflammatory gene, was identified as significantly upregulated in AD brain microglia and peripheral blood monocytes.
• A specific M1-type microglia subpopulation associated with ferroptosis expressed peripheral monocyte markers, suggesting a potential origin and role in neuroinflammation.
• Experimental validation confirmed SLC11A1 upregulation in ferroptosis-induced inflammatory microglia.

Conclusions:

• SLC11A1 plays a critical role in Alzheimer's disease, particularly in ferroptosis-mediated neuroinflammation.
• The study provides a novel molecular mechanistic insight into AD pathogenesis involving the brain-peripheral axis.
• Identified SLC11A1 as a potential therapeutic target for Alzheimer's disease.