The involvement of acetaldehyde in ethanol-induced cell cycle impairment

Marc A. Scheer, Katrina J. Schneider, Rochelle L. Finnigan, Eamon P. Maloney, Mark A. Wells, Dahn L Clemens

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Background: Hepatocytes metabolize the vast majority of ingested ethanol. This metabolic activity results in hepatic toxicity and impairs the ability of hepatocytes to replicate. Previous work by our group has shown that ethanol metabolism results in a G2/M cell cycle arrest. The intent of these studies was to discern the roles of acetaldehyde and reactive oxygen, two of the major by-products of ethanol metabolism, in the G2/M cell cycle arrest. Methods: To investigate the role of ethanol metabolites in the cell cycle arrest, VA-13 and VL-17A cells were used. These are recombinant Hep G2 cells that express alcohol dehydrogenase or alcohol dehydrogenase and cytochrome P450 2E1, respectively. Cells were cultured with or without ethanol, lacking or containing the antioxidants N-acetylcysteine (NAC) or trolox, for three days. Cellular accumulation was monitored by the DNA content of the cultures. The accumulation of the cyclin-dependent kinase, Cdc2 in the inactive phosphorylated form (p-Cdc2) and the cyclin-dependent kinase inhibitor p21 were determined by immunoblot analysis. Results: Cultures maintained in the presence of ethanol demonstrated a G2/M cell cycle arrest that was associated with a reduction in DNA content and increased levels of p-Cdc2 and p21, compared with cells cultured in its absence. Inclusion of antioxidants in the ethanol containing media was unable to rescue the cells from the cell cycle arrest or these ethanol metabolism-mediated effects. Additionally, culturing the cells in the presence of acetaldehyde alone resulted in increased levels of p-Cdc2 and p21. Conclusions: Acetaldehyde produced during ethanol oxidation has a major role in the ethanol metabolism-mediated G2/M cell cycle arrest, and the concurrent accumulation of p21 and p-Cdc2. Although reactive oxygen species are thought to have a significant role in ethanol-induced hepatocellular damage, they may have a less important role in the inability of hepatocytes to replace dead or damaged cells.

Original languageEnglish (US)
JournalBiomolecules
Volume6
Issue number2
DOIs
StatePublished - Mar 31 2016

Fingerprint

Acetaldehyde
Cell Cycle
Ethanol
Cells
G2 Phase Cell Cycle Checkpoints
Metabolism
Hepatocytes
Alcohol Dehydrogenase
Cell Cycle Checkpoints
Cultured Cells
Antioxidants
Cyclin-Dependent Kinase Inhibitor p21
Cytochrome P-450 CYP2E1
Cyclin-Dependent Kinases
DNA
Hep G2 Cells
Acetylcysteine
Metabolites
Byproducts
Toxicity

Keywords

  • Acetaldehyde
  • Cell cycle arrest
  • Cyclin-dependent kinase inhibitors
  • Cyclin-dependent kinases
  • Ethanol metabolism

ASJC Scopus subject areas

  • Medicine(all)
  • Biochemistry
  • Molecular Biology

Cite this

Scheer, M. A., Schneider, K. J., Finnigan, R. L., Maloney, E. P., Wells, M. A., & Clemens, D. L. (2016). The involvement of acetaldehyde in ethanol-induced cell cycle impairment. Biomolecules, 6(2). https://doi.org/10.3390/biom6020017

The involvement of acetaldehyde in ethanol-induced cell cycle impairment. / Scheer, Marc A.; Schneider, Katrina J.; Finnigan, Rochelle L.; Maloney, Eamon P.; Wells, Mark A.; Clemens, Dahn L.

In: Biomolecules, Vol. 6, No. 2, 31.03.2016.

Research output: Contribution to journalArticle

Scheer, MA, Schneider, KJ, Finnigan, RL, Maloney, EP, Wells, MA & Clemens, DL 2016, 'The involvement of acetaldehyde in ethanol-induced cell cycle impairment', Biomolecules, vol. 6, no. 2. https://doi.org/10.3390/biom6020017
Scheer, Marc A. ; Schneider, Katrina J. ; Finnigan, Rochelle L. ; Maloney, Eamon P. ; Wells, Mark A. ; Clemens, Dahn L. / The involvement of acetaldehyde in ethanol-induced cell cycle impairment. In: Biomolecules. 2016 ; Vol. 6, No. 2.
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AB - Background: Hepatocytes metabolize the vast majority of ingested ethanol. This metabolic activity results in hepatic toxicity and impairs the ability of hepatocytes to replicate. Previous work by our group has shown that ethanol metabolism results in a G2/M cell cycle arrest. The intent of these studies was to discern the roles of acetaldehyde and reactive oxygen, two of the major by-products of ethanol metabolism, in the G2/M cell cycle arrest. Methods: To investigate the role of ethanol metabolites in the cell cycle arrest, VA-13 and VL-17A cells were used. These are recombinant Hep G2 cells that express alcohol dehydrogenase or alcohol dehydrogenase and cytochrome P450 2E1, respectively. Cells were cultured with or without ethanol, lacking or containing the antioxidants N-acetylcysteine (NAC) or trolox, for three days. Cellular accumulation was monitored by the DNA content of the cultures. The accumulation of the cyclin-dependent kinase, Cdc2 in the inactive phosphorylated form (p-Cdc2) and the cyclin-dependent kinase inhibitor p21 were determined by immunoblot analysis. Results: Cultures maintained in the presence of ethanol demonstrated a G2/M cell cycle arrest that was associated with a reduction in DNA content and increased levels of p-Cdc2 and p21, compared with cells cultured in its absence. Inclusion of antioxidants in the ethanol containing media was unable to rescue the cells from the cell cycle arrest or these ethanol metabolism-mediated effects. Additionally, culturing the cells in the presence of acetaldehyde alone resulted in increased levels of p-Cdc2 and p21. Conclusions: Acetaldehyde produced during ethanol oxidation has a major role in the ethanol metabolism-mediated G2/M cell cycle arrest, and the concurrent accumulation of p21 and p-Cdc2. Although reactive oxygen species are thought to have a significant role in ethanol-induced hepatocellular damage, they may have a less important role in the inability of hepatocytes to replace dead or damaged cells.

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