Mitochondrial H₂O₂ emission and cellular redox state link excess fat intake to insulin resistance in both rodents and humans

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dc.contributor.authorAnderson, Ethanen_US
dc.contributor.authorLustig, Mary E.en_US
dc.contributor.authorBoyle, Kristen E.en_US
dc.contributor.authorWoodlief, Tracey L.en_US
dc.contributor.authorKane, Daniel A.en_US
dc.contributor.authorLin, Chien-Teen_US
dc.contributor.authorPrice, Jesse W. IIIen_US
dc.contributor.authorKang, Lien_US
dc.contributor.authorRabinovitch, Peter S.en_US
dc.contributor.authorSzeto, Hazel H.en_US
dc.contributor.authorHoumard, Joseph A.en_US
dc.contributor.authorCortright, Ronald N.en_US
dc.contributor.authorWasserman, David H.en_US
dc.contributor.authorNeufer, P. Darrellen_US
dc.date.accessioned2010-11-08T16:23:13Zen_US
dc.date.accessioned2011-05-17T00:09:38Z
dc.date.available2010-11-08T16:23:13Zen_US
dc.date.available2011-05-17T00:09:38Z
dc.date.issued2009-03en_US
dc.description.abstractHigh dietary fat intake leads to insulin resistance in skeletal muscle, and this represents a major risk factor for type 2 diabetes and cardiovascular disease. Mitochondrial dysfunction and oxidative stress have been implicated in the disease process, but the underlying mechanisms are still unknown. Here we show that in skeletal muscle of both rodents and humans, a diet high in fat increases the H₂O₂-emitting potential of mitochondria, shifts the cellular redox environment to a more oxidized state, and decreases the redox-buffering capacity in the absence of any change in mitochondrial respiratory function. Furthermore, we show that attenuating mitochondrial H₂O₂ emission, either by treating rats with a mitochondrial-targeted antioxidant or by genetically engineering the overexpression of catalase in mitochondria of muscle in mice, completely preserves insulin sensitivity despite a high-fat diet. These findings place the etiology of insulin resistance in the context of mitochondrial bioenergetics by demonstrating that mitochondrial H₂O₂ emission serves as both a gauge of energy balance and a regulator of cellular redox environment, linking intracellular metabolic balance to the control of insulin sensitivity. Original version available at http://www.jci.org/articles/view/37048en_US
dc.identifier.citationJ Clin Invest. 2009 March 2; 119(3): 573–581. Published online 2009 February 2.en_US
dc.identifier.pmidPMC2648700en_US
dc.identifier.urihttp://hdl.handle.net/10342/2973en_US
dc.language.isoen_USen_US
dc.relation.urihttp://www.jci.org/articles/view/37048en_US
dc.rightsPermission granted by author to Kent Nixon Myers to upload this article on 09/23/2010.en_US
dc.rightsPermission granted by author to Kent Nixon Myers to upload this article on 11/22/2010.en_US
dc.subjectDietary faten_US
dc.subjectInsulin resistanceen_US
dc.subjectSkeletal muscleen_US
dc.subjectDiabetesen_US
dc.subjectCardiovascular Diseasesen_US
dc.titleMitochondrial H₂O₂ emission and cellular redox state link excess fat intake to insulin resistance in both rodents and humansen_US

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