Cited by 86Alcohol Consumption and Health EffectsDrug-Induced Hepatotoxicity and ProtectionLiver physiology and pathology

Plasma membrane hydroxyethyl radical adducts cause antibody-dependent cytotoxicity in rat hepatocytes exposed to alcohol

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Clot, P, Parola, M, Bellomo, G, Dianzani, U, Carini, R, Tabone, M, Arico, S, Ingelman- Sundberg, M +1 more·1997·Gastroenterology

Abstract

Background & aims We reported previously that patients with alcoholic liver disease (ALD) have circulating immunoglobulins reacting with cytochrome P4502E1 (CYP2E1) complexed with hydroxyethyl free radicals. The aim of this study was to investigate whether hydroxyethyl radical adducts are present on the plasma membranes of ethanol-treated hepatocytes and their role in antibody-dependent cytotoxicity.Methods Immunofluorescence confocal laser microscopy, Western blotting, and antibody-dependent cell-mediated cytotoxicity assay were used.Results Isolated rat hepatocytes incubated in vitro with ethanol or obtained from ethanol-treated animals showed strong surface fluorescence when exposed to rabbit anti-hydroxyethyl radical serum or sera from patients with ALD. No surface fluorescence was evident on control hepatocytes or after scavenging hydroxyethyl radicals with 4-pyridyl-1-oxide-t-butyl nitrone. The presence of CYP2E1-hydroxyethyl radical adducts on hepatocyte plasma membranes was shown by Western blot and by immunofluorescence using double staining for human and rabbit anti-CYP2E1 immunoglobulin G. Cytotoxicity was observed in ethanol-treated hepatocytes incubated with immunoglobulin G from patients with ALD and normal human blood mononuclear cells. This effect was blocked by preabsorbing the sera with human albumin complexed with hydroxyethyl radicals, which also eliminated the antibody reaction with the plasma membranes.Conclusions Hydroxyethyl radicals bound to CYP2E1 on hepatocyte plasma membranes can target immune reactions triggered by alcohol abuse.

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Cited by

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Authors
Clot, P., Parola, M., Bellomo, G., Dianzani, U., Carini, R., Tabone, M., Arico, S., Ingelman- Sundberg, M., & Albano, E.
Affiliations
University of Turin (IT)
Venue
Gastroenterology
Publisher
Elsevier BV
Published
1997-07
Volume
113
Issue
1
Pages
265-276
ISSN
0016-5085 (ISSN-L)
OpenAlex
W2068601876
Cited by
86
References
4
Citations by year
2022: 1 · 2021: 1 · 2018: 3 · 2016: 1 · 2015: 3 · 2014: 2 · 2013: 3 · 2012: 1
FWCI
5.10
Type
journal article
Language
en
Open access
Locations
  • Gastroenterology (publishedVersion)
  • PubMed (publishedVersion)
  • Institutional Research Information System University of Turin (University of Turin) (submittedVersion)
Topics
  • Health Sciences › Medicine › Pathology and Forensic Medicine › Alcohol Consumption and Health Effects
  • Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmacology › Drug-Induced Hepatotoxicity and Protection
  • Health Sciences › Medicine › Hepatology › Liver physiology and pathology
Keywords
CYP2E1, alcoholic liver disease, antibody-dependent cellular cytotoxicity, hepatocyte plasma membrane, ethanol, autoantibodies, alcohol abuse, IgG
MeSH terms
Ethanol, Animals, Antibody-Dependent Cell Cytotoxicity, Cell Membrane, Free Radicals, Humans, Liver, Liver Diseases, Alcoholic, Male, Microsomes, Liver, Rabbits, Blotting, Western, Rats, Sprague-Dawley, Microscopy, Confocal, Cytochrome P-450 CYP2E1, Rats

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