Title : Genetically increasing flux through β-oxidation in skeletal muscle increases mitochondrial reductive stress and glucose intolerance.

Pub. Date : 2021 May 1

PMID : 33813880






4 Functional Relationships(s)
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1 In mice overexpressing peroxisome proliferator activated receptor-alpha in muscle (MCK-PPARalpha), lipid supported mitochondrial respiration, membrane potential (DeltaPsim) and H2O2 production rate (JH2O2) were increased, which coincided with a more oxidized cytosolic redox environment, reduced muscle glucose uptake, and whole-body glucose intolerance despite an increased rate of energy expenditure. Glucose peroxisome proliferator activated receptor alpha Mus musculus
2 Crossing MCAT (mitochondrial-targeted catalase) with MCK-PPARalpha mice normalized JH2O2 production, redox environment and glucose tolerance, but surprisingly both basal and absolute insulin-stimulated rates of glucose uptake in muscle remained depressed. Glucose peroxisome proliferator activated receptor alpha Mus musculus
3 Also surprising, when placed on a high fat diet MCK-PPARalpha mice were characterized by much lower whole body, fat and lean mass as well as improved glucose tolerance relative to wild-type mice, providing additional evidence that overexpression of PPARalpha in muscle imposes more extensive metabolic stress than experienced by wild-type mice on a high fat diet. Glucose peroxisome proliferator activated receptor alpha Mus musculus
4 Also surprising, when placed on a high fat diet MCK-PPARalpha mice were characterized by much lower whole body, fat and lean mass as well as improved glucose tolerance relative to wild-type mice, providing additional evidence that overexpression of PPARalpha in muscle imposes more extensive metabolic stress than experienced by wild-type mice on a high fat diet. Glucose peroxisome proliferator activated receptor alpha Mus musculus