Ethanol activates immune response in lymphoblastoid cells.

Area of Science:

• Neuroscience
• Genomics
• Immunology

Background:

• Studying alcohol's short-term effects on human brain gene expression is challenging.
• Immune cells offer an accessible model due to alcohol's impact on neuroimmune signaling.
• These cells may provide valuable biomarkers for alcohol use disorders.

Purpose of the Study:

• To investigate the short-term effects of ethanol exposure on gene expression in lymphoblastoid cell lines (LCLs).
• To compare gene expression patterns between LCLs from alcoholic and control subjects.
• To identify potential gene expression biomarkers for alcohol use disorders.

Main Methods:

• RNA sequencing (RNAseq) was employed to analyze gene expression.
• LCLs from 20 alcoholic and 20 control subjects were exposed to ethanol for 48 hours.
• Differential gene expression analysis was performed using a false discovery rate (FDR) ≤ 0.05.

Main Results:

• Ethanol exposure significantly altered the expression of 4456 genes (35.6% of detected genes), with 52% showing increased expression.
• Activated pathways included NFκB, neuroinflammation, IL6, IL2, IL8, and dendritic cell maturation.
• Decreased signaling was observed in Interferons A and B, EIF2, phospholipase C, and glycolysis pathways.
• Baseline gene expression differences between alcoholic and control subjects were minimal, but suggested compensatory mechanisms.
• Alcoholic subjects showed increased signaling by interferons, TLR2, and TLR3, and lower expression of cholesterol biosynthesis genes, including HMGCR.

Conclusions:

• Lymphoblastoid cell lines exhibit significant gene expression changes in response to ethanol exposure.
• These findings suggest that immune cells can serve as a model for studying alcohol's effects and may yield biomarkers for alcohol use disorders.
• Identifying ethanol-altered genes and pathways can help interpret genetic findings from Genome-Wide Association Studies (GWAS).