Franko, A., von Kleist-Retzow, J. C., Boese, M., Sanchez-Lasheras, C., Brodesser, S., Krut, O., Kunz, W. S., Wiedermann, D., Hoehn, M., Stoehr, O., Moll, L., Freude, S., Krone, W., Schubert, M. and Wiesner, R. J. (2012). Complete failure of insulin-transmitted signaling, but not obesity-induced insulin resistance, impairs respiratory chain function in muscle. J. Mol. Med., 90 (10). S. 1145 - 1161. NEW YORK: SPRINGER. ISSN 0946-2716

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Abstract

The role of mitochondrial dysfunction in the development of insulin resistance and type 2 diabetes remains controversial. In order to specifically define the relationship between insulin receptor (InsR) signaling, insulin resistance, hyperglycemia, hyperlipidemia and mitochondrial function, we analyzed mitochondrial performance of insulin-sensitive, slow-oxidative muscle in four different mouse models. In obese but normoglycemic ob/ob mice as well as in obese but diabetic mice under high-fat diet, mitochondrial performance remained unchanged even though intramyocellular diacylglycerols (DAGs), triacylglycerols (TAGs), and ceramides accumulated. In contrast, in muscle-specific InsR knockout (MIRKO) and streptozotocin (STZ)-treated hypoinsulinemic, hyperglycemic mice, levels of mitochondrial respiratory chain complexes and mitochondrial function were markedly reduced. In STZ, but not in MIRKO mice, this was caused by reduced transcription of mitochondrial genes mediated via decreased PGC-1 alpha expression. We conclude that mitochondrial dysfunction is not causally involved in the pathogenesis of obesity-associated insulin resistance under normoglycemic conditions. However, obesity-associated type 2 diabetes and accumulation of DAGs or TAGs is not associated with impaired mitochondrial function. In contrast, chronic hypoinsulinemia and hyperglycemia as seen in STZ-treated mice as well as InsR deficiency in muscle of MIRKO mice lead to mitochondrial dysfunction. We postulate that decreased mitochondrial mass and/or performance in skeletal muscle of non-diabetic, obese or type 2 diabetic, obese patients observed in clinical studies must be explained by genetic predisposition, physical inactivity, or other still unknown factors.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Franko, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
von Kleist-Retzow, J. C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Boese, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sanchez-Lasheras, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Brodesser, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Krut, O.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kunz, W. S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wiedermann, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hoehn, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Stoehr, O.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Moll, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Freude, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Krone, W.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schubert, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wiesner, R. J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-482058
DOI: 10.1007/s00109-012-0887-y
Journal or Publication Title: J. Mol. Med.
Volume: 90
Number: 10
Page Range: S. 1145 - 1161
Date: 2012
Publisher: SPRINGER
Place of Publication: NEW YORK
ISSN: 0946-2716
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
MITOCHONDRIAL ATP PRODUCTION; FATTY-ACID OXIDATION; SKELETAL-MUSCLE; OB/OB MICE; DYSFUNCTION; METABOLISM; LIVER; PHOSPHORYLATION; SUPERCOMPLEXES; SPHINGOLIPIDSMultiple languages
Genetics & Heredity; Medicine, Research & ExperimentalMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/48205

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