Linked Life Data

16962935

Source:http://linkedlifedata.com/resource/pubmed/id/16962935

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
7
pubmed:dateCreated
2006-9-11
pubmed:abstractText
Ethanol treatment causes an increase in expression of TGF-beta1 and CYP2E1 in the centrilobular area. Alcoholic liver disease is usually initiated in the centrilobular region of the liver. We hypothesized that the combination of TGF-beta1 and CYP2E1 produces increased oxidative stress and liver cell toxicity. To test this possibility, we studied the effects of TGF-beta1 on the viability of HepG2 E47 cells that express human CYP2E1, and C34 HepG2 cells, which do not express CYP2E1. E47 cells underwent greater growth inhibition and enhanced apoptosis after TGF-beta1 treatment, as compared to the C34 cells. There was an enhanced production of reactive oxygen species (ROS) and a decline in reduced glutathione (GSH) levels in the TGF-beta1-treated E47 cells and the enhanced cell death could be prevented by antioxidants. The CYP2E1 inhibitor diallyl sulfide prevented the potentiated cell death in E47 cells validating the role of CYP2E1. Mitochondrial membrane potential declined in the TGF-beta1-treated E47 cells, prior to developing toxicity, and cell death could be prevented by trifluoperazine, an inhibitor of the mitochondrial membrane permeability transition. TGF-beta1 also produced a loss of cell viability in hepatocytes from pyrazole-treated rats with elevated levels of CYP2E1, compared to control hepatocytes. In conclusion, increased toxic interactions by TGF-beta1 plus CYP2E1 can occur by a mechanism involving increased production of intracellular ROS and depletion of GSH, resulting in mitochondrial membrane damage and loss of membrane potential, followed by apoptosis. Potentiation of TGF-beta1-induced cell death by CYP2E1 may contribute to mechanisms of alcohol-induced liver disease.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Oct
pubmed:issn
0891-5849
pubmed:author
pubmed:issnType
Print
pubmed:day
1
pubmed:volume
41
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1100-12
pubmed:dateRevised
2007-12-3
pubmed:meshHeading
pubmed:year
2006
pubmed:articleTitle
Increased toxicity by transforming growth factor-beta 1 in liver cells overexpressing CYP2E1.
pubmed:affiliation
Department of Pharmacology and Biological Chemistry, Mount Sinai School of Medicine, One Gustave L. Place, New York, NY 10029, USA.
pubmed:publicationType
Journal Article, Research Support, N.I.H., Extramural