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http://hdl.handle.net/2445/177273
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DC Field | Value | Language |
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dc.contributor.author | Satapati, Santhosh | - |
dc.contributor.author | Sunny, Nishanth E. | - |
dc.contributor.author | Kucejova, Blanka | - |
dc.contributor.author | Fu, Xiaorong | - |
dc.contributor.author | He, Tian Teng | - |
dc.contributor.author | Méndez-Lucas, Andrés | - |
dc.contributor.author | Shelton, John M. | - |
dc.contributor.author | Perales Losa, Carlos | - |
dc.contributor.author | Browning, Jeffrey D. | - |
dc.contributor.author | Burgess, Shawn C. | - |
dc.date.accessioned | 2021-05-13T14:14:13Z | - |
dc.date.available | 2021-05-13T14:14:13Z | - |
dc.date.issued | 2012-06-01 | - |
dc.identifier.issn | 0022-2275 | - |
dc.identifier.uri | http://hdl.handle.net/2445/177273 | - |
dc.description.abstract | The manner in which insulin resistance impinges on hepatic mitochondrial function is complex. Although liver insulin resistance is associated with respiratory dysfunction, the effect on fat oxidation remains controversial, and biosynthetic pathways that traverse mitochondria are actually increased. The tricarboxylic acid (TCA) cycle is the site of terminal fat oxidation, chief source of electrons for respiration, and a metabolic progenitor of gluconeogenesis. Therefore, we tested whether insulin resistance promotes hepatic TCA cycle flux in mice progressing to insulin resistance and fatty liver on a high-fat diet (HFD) for 32 weeks using standard biomolecular and in vivo (2)H/(13)C tracer methods. Relative mitochondrial content increased, but respiratory efficiency declined by 32 weeks of HFD. Fasting ketogenesis became unresponsive to feeding or insulin clamp, indicating blunted but constitutively active mitochondrial β-oxidation. Impaired insulin signaling was marked by elevated in vivo gluconeogenesis and anaplerotic and oxidative TCA cycle flux. The induction of TCA cycle function corresponded to the development of mitochondrial respiratory dysfunction, hepatic oxidative stress, and inflammation. Thus, the hepatic TCA cycle appears to enable mitochondrial dysfunction during insulin resistance by increasing electron deposition into an inefficient respiratory chain prone to reactive oxygen species production and by providing mitochondria-derived substrate for elevated gluconeogenesis. | - |
dc.format.extent | 13 p. | - |
dc.format.mimetype | application/pdf | - |
dc.language.iso | eng | - |
dc.publisher | American Society for Biochemistry and Molecular Biology | - |
dc.relation.isformatof | Reproducció del document publicat a: https://doi.org/10.1194/jlr.M023382 | - |
dc.relation.ispartof | Journal of Lipid Research, 2012, vol. 53, num. 6, p. 1080-1092 | - |
dc.relation.uri | https://doi.org/10.1194/jlr.M023382 | - |
dc.rights | (c) American Society for Biochemistry and Molecular Biology, 2012 | - |
dc.source | Articles publicats en revistes (Ciències Fisiològiques) | - |
dc.subject.classification | Àcid cítric | - |
dc.subject.classification | Dieta | - |
dc.subject.classification | Àcids grassos | - |
dc.subject.classification | Fetge | - |
dc.subject.classification | Resistència a la insulina | - |
dc.subject.other | Citric acid | - |
dc.subject.other | Diet | - |
dc.subject.other | Fatty acids | - |
dc.subject.other | Liver | - |
dc.subject.other | Insulin resistance | - |
dc.title | Elevated TCA cycle function in the pathology of diet-induced hepatic insulin resistance and fatty liver | - |
dc.type | info:eu-repo/semantics/article | - |
dc.type | info:eu-repo/semantics/publishedVersion | - |
dc.identifier.idgrec | 632428 | - |
dc.date.updated | 2021-05-13T14:14:13Z | - |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | - |
dc.identifier.pmid | 22493093 | - |
Appears in Collections: | Articles publicats en revistes (Ciències Fisiològiques) |
Files in This Item:
File | Description | Size | Format | |
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632428.pdf | 1.36 MB | Adobe PDF | View/Open |
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