Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
12
pubmed:dateCreated
2001-6-22
pubmed:abstractText
Mitochondria can either enhance or suppress cell death. Cytochrome c release from mitochondria and depolarization of the mitochondrial membrane potential (DeltaPsi) are crucial events in triggering apoptosis. In contrast, activation of mitochondrial ATP-sensitive potassium (mitoK(ATP)) channels prevents lethal ischemic injury in vivo, implicating these channels as key players in the process of ischemic preconditioning. We probed the relationship between mitoK(ATP) channels and apoptosis in cultured neonatal rat cardiac ventricular myocytes. Incubation with 200 micromol/L hydrogen peroxide induced TUNEL positivity, cytochrome c translocation, caspase-3 activation, poly(ADP-ribose) polymerase cleavage, and dissipation of DeltaPsi. Pharmacological opening of mitoK(ATP) channels by diazoxide (100 micromol/L) preserved mitochondrial integrity and suppressed all markers of apoptosis. Diazoxide prevented DeltaPsi depolarization in a concentration-dependent manner (EC(50) approximately 40 micromol/L, with saturation by 100 micromol/L), as shown by both flow cytometry and quantitative image analysis of cells stained with fluorescent DeltaPsi indicators. These cytoprotective effects of diazoxide were reproduced by pinacidil, another mitoK(ATP) agonist, and blocked by the mitoK(ATP) channel antagonist 5-hydroxydecanoate (500 micromol/L). Our findings identify a novel mitochondrial pathway that is protective against apoptosis. The results also pinpoint mitoK(ATP) channels as logical therapeutic targets in diseases of enhanced apoptosis and oxidative stress.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
http://linkedlifedata.com/resource/pubmed/chemical/5-hydroxydecanoic acid, http://linkedlifedata.com/resource/pubmed/chemical/Adenosine Triphosphate, http://linkedlifedata.com/resource/pubmed/chemical/Casp3 protein, rat, http://linkedlifedata.com/resource/pubmed/chemical/Caspase 3, http://linkedlifedata.com/resource/pubmed/chemical/Caspases, http://linkedlifedata.com/resource/pubmed/chemical/Cytochrome c Group, http://linkedlifedata.com/resource/pubmed/chemical/Decanoic Acids, http://linkedlifedata.com/resource/pubmed/chemical/Diazoxide, http://linkedlifedata.com/resource/pubmed/chemical/Fluorescent Dyes, http://linkedlifedata.com/resource/pubmed/chemical/Hydrogen Peroxide, http://linkedlifedata.com/resource/pubmed/chemical/Hydroxy Acids, http://linkedlifedata.com/resource/pubmed/chemical/Pinacidil, http://linkedlifedata.com/resource/pubmed/chemical/Potassium Channel Blockers, http://linkedlifedata.com/resource/pubmed/chemical/Potassium Channels
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
1524-4571
pubmed:author
pubmed:issnType
Electronic
pubmed:day
22
pubmed:volume
88
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1267-75
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed-meshheading:11420303-Adenosine Triphosphate, pubmed-meshheading:11420303-Animals, pubmed-meshheading:11420303-Apoptosis, pubmed-meshheading:11420303-Caspase 3, pubmed-meshheading:11420303-Caspases, pubmed-meshheading:11420303-Cells, Cultured, pubmed-meshheading:11420303-Cytochrome c Group, pubmed-meshheading:11420303-Decanoic Acids, pubmed-meshheading:11420303-Diazoxide, pubmed-meshheading:11420303-Dose-Response Relationship, Drug, pubmed-meshheading:11420303-Flow Cytometry, pubmed-meshheading:11420303-Fluorescent Dyes, pubmed-meshheading:11420303-Heart Ventricles, pubmed-meshheading:11420303-Hydrogen Peroxide, pubmed-meshheading:11420303-Hydroxy Acids, pubmed-meshheading:11420303-Image Processing, Computer-Assisted, pubmed-meshheading:11420303-In Situ Nick-End Labeling, pubmed-meshheading:11420303-Membrane Potentials, pubmed-meshheading:11420303-Mitochondria, pubmed-meshheading:11420303-Myocardium, pubmed-meshheading:11420303-Oxidative Stress, pubmed-meshheading:11420303-Pinacidil, pubmed-meshheading:11420303-Potassium Channel Blockers, pubmed-meshheading:11420303-Potassium Channels, pubmed-meshheading:11420303-Protein Transport, pubmed-meshheading:11420303-Rats, pubmed-meshheading:11420303-Rats, Sprague-Dawley
pubmed:year
2001
pubmed:articleTitle
Mitochondrial ATP-sensitive potassium channels inhibit apoptosis induced by oxidative stress in cardiac cells.
pubmed:affiliation
Institute of Molecular Cardiobiology, The Johns Hopkins University, Baltimore, Md, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't