Deep Proteomic Profiling of Human Stem Cell-Derived Microglia: Insights Into Inflammatory and Alcohol-Induced...

Area of Science:

• Neuroimmunology
• Neuroscience
• Cell Biology

Background:

• Alcohol use disorder (AUD) involves neuroimmune dysregulation, with microglia implicated in neurotoxicity.
• The specific molecular mechanisms of alcohol-induced microglial changes in humans remain unclear.

Purpose of the Study:

• To comprehensively characterize global molecular changes in human microglia exposed to ethanol.
• To compare ethanol's effects with inflammatory mediators like LPS and TNFα.
• To identify novel pathways involved in human microglial responses to ethanol.

Main Methods:

• Human stem cell-derived microglia (iMGLs) were differentiated and exposed to ethanol, LPS, and TNFα.
• Proteomics was performed using data-independent acquisition (DIA) mass spectrometry.
• Functional assays included Luminex cytokine analysis and phagocytosis assays.

Main Results:

• Ethanol induced distinct, time-dependent proteomic changes in iMGLs, differing from LPS/TNFα.
• Ethanol did not elicit a proinflammatory cytokine response, unlike LPS/TNFα.
• Ethanol exposure for 48 hours increased iMGL phagocytic activity.

Conclusions:

• Ethanol exposure shapes unique, temporally dependent molecular phenotypes in human iMGLs.
• These responses differ significantly from inflammatory stimuli, suggesting specific AUD mechanisms.
• Findings underscore the importance of human-specific models for studying neuroimmune interactions in AUD.