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Assessment of Glutamine as a Fuel Source for Alveolar Macrophages Exposed to Chronic Ethanol Using an Extracellular Flux Bioanalyzer
Published on: November 15, 2024
Glutathione availability modulates alveolar macrophage function in the chronic ethanol-fed rat
Lou Ann S Brown1, Xiao-Du Ping, Frank L Harris
1Department of Pediatrics, Emory University School of Medicine, Atlanta, GA 30322, USA. lbrow03@emory.edu
American Journal of Physiology. Lung Cellular and Molecular Physiology
|November 24, 2006
Summary
Chronic alcohol exposure impairs lung macrophage function by decreasing glutathione, leading to oxidative stress and reduced bacterial clearance. Supplementing glutathione precursors restored macrophage function and viability in alcoholic rats.
Area of Science:
- Pulmonary immunology
- Cellular toxicology
- Oxidative stress research
Background:
- Chronic alcohol consumption is linked to impaired alveolar macrophage function.
- The precise mechanism behind alcohol-induced macrophage dysfunction, particularly concerning phagocytosis, remains unclear.
- Previous work indicated alcohol decreases alveolar glutathione levels.
Purpose of the Study:
- To investigate if ethanol-induced alveolar macrophage dysfunction is caused by decreased glutathione and subsequent oxidative stress.
- To determine the impact of ethanol on macrophage phagocytosis and apoptosis.
- To assess the therapeutic potential of glutathione precursors in mitigating alcohol's effects on lung macrophages.
Main Methods:
- Rats were fed ethanol for 6 weeks to induce chronic alcohol exposure.
- Glutathione levels and the GSH/GSSG redox potential were measured in alveolar macrophages.
- Macrophage phagocytic capacity was assessed using fluorescent Staphylococcus aureus.
- Apoptosis rates in alveolar macrophages were quantified.
- Glutathione precursors (procysteine or N-acetyl cysteine) were administered with the ethanol diet.
Main Results:
- Ethanol ingestion led to increased oxidant stress in alveolar macrophages, evidenced by altered GSH/GSSG redox potential.
- Phagocytosis of Staphylococcus aureus by macrophages from ethanol-fed rats was significantly reduced (20%) compared to controls (80%).
- Ethanol-induced macrophage dysfunction was associated with increased apoptosis.
- Administration of glutathione precursors normalized glutathione levels, oxidant stress, macrophage phagocytosis, and viability.
Conclusions:
- Decreased glutathione availability in the alcoholic lung contributes to alveolar macrophage dysfunction.
- Oxidative stress, resulting from glutathione depletion, impairs both the function and viability of alveolar macrophages.
- Glutathione precursor supplementation can reverse ethanol-induced oxidative stress and restore macrophage immune function.
