Linked Life Data

12423342

Source:http://linkedlifedata.com/resource/pubmed/id/12423342

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
22
pubmed:dateCreated
2002-11-8
pubmed:abstractText
The oxidant function of pro-apoptotic protein Bax was investigated through heterologous expression in yeast. Direct measurements of fatty acid content show that Bax-expression induces oxidation of mitochondrial lipids. This effect is prevented by the coexpression of Bcl-xL. The oxidation actually could be followed on isolated mitochondria as respiration-induced peroxidation of polyunsaturated cis-parinaric acid and on whole cells as the increase in the amount of thiobarbituric acid-reactive products. Treatments that increase the unsaturation ratio of lipids, making them more sensitive to oxidation, increase kinetics of Bax-induced death. Conversely, inhibitors of lipid oxidation and treatments that decrease the unsaturation ratio of fatty acids decrease kinetics of Bax-induced death. Taken together, these results show that Bax-induced mitochondrial lipid oxidation is relevant to Bax-induced cell death. Conversely, lipid oxidation is poorly related to the massive Bax-induced superoxide and hydrogen peroxide accumulation, which occurs at the same time, as chemical or enzymatic scavenging of ROS does not prevent lipid oxidation nor has any effects on kinetics of Bax-induced cell death. Whatever the origin of mitochondrial lipid oxidation, these data show that it represents a major step in the cascade of events leading to Bax-induced cell death. These results are discussed in the light of the role of lipid oxidation both in mammalian apoptosis and in other forms of cell death in other organisms.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Nov
pubmed:issn
0014-2956
pubmed:author
pubmed:issnType
Print
pubmed:volume
269
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
5440-50
pubmed:dateRevised
2007-7-23
pubmed:meshHeading
pubmed-meshheading:12423342-Apoptosis, pubmed-meshheading:12423342-Cell Death, pubmed-meshheading:12423342-Fatty Acids, pubmed-meshheading:12423342-Genotype, pubmed-meshheading:12423342-Kinetics, pubmed-meshheading:12423342-Lipid Metabolism, pubmed-meshheading:12423342-Mitochondria, pubmed-meshheading:12423342-Oxygen, pubmed-meshheading:12423342-Phospholipids, pubmed-meshheading:12423342-Proto-Oncogene Proteins, pubmed-meshheading:12423342-Proto-Oncogene Proteins c-bcl-2, pubmed-meshheading:12423342-Reactive Oxygen Species, pubmed-meshheading:12423342-Spheroplasts, pubmed-meshheading:12423342-Superoxide Dismutase, pubmed-meshheading:12423342-Thiobarbituric Acid Reactive Substances, pubmed-meshheading:12423342-Time Factors, pubmed-meshheading:12423342-bcl-2-Associated X Protein, pubmed-meshheading:12423342-bcl-X Protein
pubmed:year
2002
pubmed:articleTitle
Bax-induced cell death in yeast depends on mitochondrial lipid oxidation.
pubmed:affiliation
UMR5095 C.N.R.S./Université de Bordeaux 2, Bordeaux, France; UMR5544 C.N.R.S./Université de Bordeaux 2, Bordeaux, France.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't