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Pathogenesis of Alcoholic Fatty Liver a Narrative Review.
Helmut K Seitz1, Bernardo Moreira1, Manuela G Neuman2
1Centre of Liver and Alcohol Associated Diseases, Ethianum Clinic, Faculty of Medicine, University of Heidelberg, 69120 Heidelberg, Germany.
Life (Basel, Switzerland)
|August 26, 2023
Summary
Alcohol disrupts liver fat metabolism by inhibiting AMPK and promoting fatty acid synthesis, leading to fat accumulation. Gut dysbiosis and inflammation further worsen alcoholic fatty liver disease (ALD).
Area of Science:
- Hepatology
- Metabolic pathways
- Alcoholic liver disease pathogenesis
Background:
- Alcohol consumption significantly impacts hepatic lipid metabolism, leading to fat accumulation.
- Obesity and dietary fat composition can modulate alcohol's effects on the liver.
- Alcohol disrupts key signaling pathways involved in lipid regulation and cellular stress responses.
Purpose of the Study:
- To elucidate the multifaceted mechanisms by which alcohol induces hepatic lipid accumulation.
- To investigate the role of signaling pathways like AMPK, PPARα, and SREBP1c in alcoholic fatty liver.
- To explore the contribution of alcohol-induced gut dysbiosis and inflammation to liver damage.
Main Methods:
- Analysis of alcohol's effects on adenosine monophosphate activated kinase (AMPK) and downstream targets.
- Investigation of cytochrome P4502E1 (CYP2E1)-mediated oxidative stress and mitochondrial damage.
- Assessment of alcohol-induced changes in adiponectin, very-low-density lipoprotein (VLDL) secretion, and gut microbiota.
Main Results:
- Alcohol inhibits AMPK, reducing fatty acid oxidation and promoting fatty acid synthesis.
- Oxidative stress from CYP2E1 damages mitochondria, further impairing fatty acid beta-oxidation.
- Alcohol-induced gut dysbiosis, bacterial translocation, and inflammatory pathways (NFκB) contribute to liver injury and fibrosis.
Conclusions:
- Alcohol disrupts hepatic lipid metabolism through multiple interacting pathways, including AMPK inhibition and altered lipid synthesis/oxidation.
- Gut dysbiosis and associated inflammation play a critical role in the progression of alcoholic fatty liver disease.
- Targeting these metabolic and inflammatory pathways may offer therapeutic strategies for alcoholic liver disease.
Keywords:
adenosine monophosphate activated kinasealcoholic fatty livercytochrome P450 2E1oxidative stressperoxisome proliferator activated receptor αsterol regulatory element binding protein 1cMore Related Videos
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