Disturbed hepatic carbohydrate management during high metabolic demand in medium-chain acyl-CoA dehydrogenase (MCAD)-deficient mice

Herrema, Hilde, Derks, Terry G J, van Dijk, Theo H, Bloks, Vincent W, Gerding, Albert, Havinga, Rick, Tietge, Uwe J F, Müller, Michael ORCID: https://orcid.org/0000-0002-5930-9905, Smit, G Peter A, Kuipers, Folkert and Reijngoud, Dirk-Jan (2008) Disturbed hepatic carbohydrate management during high metabolic demand in medium-chain acyl-CoA dehydrogenase (MCAD)-deficient mice. Hepatology, 47 (6). pp. 1894-1904. ISSN 1527-3350

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Medium-chain acyl-coenzyme A (CoA) dehydrogenase (MCAD) catalyzes crucial steps in mitochondrial fatty acid oxidation, a process that is of key relevance for maintenance of energy homeostasis, especially during high metabolic demand. To gain insight into the metabolic consequences of MCAD deficiency under these conditions, we compared hepatic carbohydrate metabolism in vivo in wild-type and MCAD(-/-) mice during fasting and during a lipopolysaccharide (LPS)-induced acute phase response (APR). MCAD(-/-) mice did not become more hypoglycemic on fasting or during the APR than wild-type mice did. Nevertheless, microarray analyses revealed increased hepatic peroxisome proliferator-activated receptor gamma coactivator-1alpha (Pgc-1alpha) and decreased peroxisome proliferator-activated receptor alpha (Ppar alpha) and pyruvate dehydrogenase kinase 4 (Pdk4) expression in MCAD(-/-) mice in both conditions, suggesting altered control of hepatic glucose metabolism. Quantitative flux measurements revealed that the de novo synthesis of glucose-6-phosphate (G6P) was not affected on fasting in MCAD(-/-) mice. During the APR, however, this flux was significantly decreased (-20%) in MCAD(-/-) mice compared with wild-type mice. Remarkably, newly formed G6P was preferentially directed toward glycogen in MCAD(-/-) mice under both conditions. Together with diminished de novo synthesis of G6P, this led to a decreased hepatic glucose output during the APR in MCAD(-/-) mice; de novo synthesis of G6P and hepatic glucose output were maintained in wild-type mice under both conditions. APR-associated hypoglycemia, which was observed in wild-type mice as well as MCAD(-/-) mice, was mainly due to enhanced peripheral glucose uptake.

Item Type: Article
Uncontrolled Keywords: acyl-coa dehydrogenase,animals,blood glucose,carbohydrate metabolism,disease models, animal,energy metabolism,fatty acids,gene expression regulation, enzymologic,glucose-6-phosphate,glycogen,hypoglycemia,lipopolysaccharides,liver,liver diseases,male,mice,mice, knockout,mitochondria, liver
Faculty \ School: Faculty of Medicine and Health Sciences > Norwich Medical School
UEA Research Groups: Faculty of Medicine and Health Sciences > Research Groups > Nutrition and Preventive Medicine
Faculty of Medicine and Health Sciences > Research Groups > Gastroenterology and Gut Biology
Depositing User: Pure Connector
Date Deposited: 10 Jun 2014 21:50
Last Modified: 24 Oct 2022 06:07
URI: https://ueaeprints.uea.ac.uk/id/eprint/47711
DOI: 10.1002/hep.22284

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