Martines 2019 Sci Rep
|Martines AMF, Gerding A, Stolle S, Vieira-Lara MA, Wolters JC, Jurdzinski A, Bongiovanni L, de Bruin A, van der Vlies P, van der Vries G, Bloks VW, Derks TGJ, Reijngoud DJ, Bakker BM (2019) Transcriptome analysis suggests a compensatory role of the cofactors coenzyme A and NAD+ in medium-chain acyl-CoA dehydrogenase knockout mice. Sci Rep 9:14539.|
Abstract: During fasting, mitochondrial fatty-acid β-oxidation (mFAO) is essential for the generation of glucose by the liver. Children with a loss-of-function deficiency in the mFAO enzyme medium-chain acyl-Coenzyme A dehydrogenase (MCAD) are at serious risk of life-threatening low blood glucose levels during fasting in combination with intercurrent disease. However, a subset of these children remains asymptomatic throughout life. In MCAD-deficient (MCAD-KO) mice, glucose levels are similar to those of wild-type (WT) mice, even during fasting. We investigated if metabolic adaptations in the liver may underlie the robustness of this KO mouse. WT and KO mice were given a high- or low-fat diet and subsequently fasted. We analyzed histology, mitochondrial function, targeted mitochondrial proteomics, and transcriptome in liver tissue. Loss of MCAD led to a decreased capacity to oxidize octanoyl-CoA. This was not compensated for by altered protein levels of the short- and long-chain isoenzymes SCAD and LCAD. In the transcriptome, we identified subtle adaptations in the expression of genes encoding enzymes catalyzing CoA- and NAD(P)(H)-involving reactions and of genes involved in detoxification mechanisms. We discuss how these processes may contribute to robustness in MCAD-KO mice and potentially also in asymptomatic human subjects with a complete loss of MCAD activity.
Labels: MiParea: Respiration, Genetic knockout;overexpression, Exercise physiology;nutrition;life style
Organism: Mouse Tissue;cell: Liver Preparation: Isolated mitochondria
Coupling state: LEAK, OXPHOS Pathway: F, N HRR: Oxygraph-2k