Unknown

Dataset Information

0

Adaptation of myocardial substrate metabolism to a ketogenic nutrient environment.


ABSTRACT: Heart muscle is metabolically versatile, converting energy stored in fatty acids, glucose, lactate, amino acids, and ketone bodies. Here, we use mouse models in ketotic nutritional states (24 h of fasting and a very low carbohydrate ketogenic diet) to demonstrate that heart muscle engages a metabolic response that limits ketone body utilization. Pathway reconstruction from microarray data sets, gene expression analysis, protein immunoblotting, and immunohistochemical analysis of myocardial tissue from nutritionally modified mouse models reveal that ketotic states promote transcriptional suppression of the key ketolytic enzyme, succinyl-CoA:3-oxoacid CoA transferase (SCOT; encoded by Oxct1), as well as peroxisome proliferator-activated receptor alpha-dependent induction of the key ketogenic enzyme HMGCS2. Consistent with reduction of SCOT, NMR profiling demonstrates that maintenance on a ketogenic diet causes a 25% reduction of myocardial (13)C enrichment of glutamate when (13)C-labeled ketone bodies are delivered in vivo or ex vivo, indicating reduced procession of ketones through oxidative metabolism. Accordingly, unmetabolized substrate concentrations are higher within the hearts of ketogenic diet-fed mice challenged with ketones compared with those of chow-fed controls. Furthermore, reduced ketone body oxidation correlates with failure of ketone bodies to inhibit fatty acid oxidation. These results indicate that ketotic nutrient environments engage mechanisms that curtail ketolytic capacity, controlling the utilization of ketone bodies in ketotic states.

SUBMITTER: Wentz AE 

PROVIDER: S-EPMC2915681 | biostudies-literature | 2010 Aug

REPOSITORIES: biostudies-literature

altmetric image

Publications

Adaptation of myocardial substrate metabolism to a ketogenic nutrient environment.

Wentz Anna E AE   d'Avignon D André DA   Weber Mary L ML   Cotter David G DG   Doherty Jason M JM   Kerns Robnet R   Nagarajan Rakesh R   Reddy Naveen N   Sambandam Nandakumar N   Crawford Peter A PA  

The Journal of biological chemistry 20100607 32


Heart muscle is metabolically versatile, converting energy stored in fatty acids, glucose, lactate, amino acids, and ketone bodies. Here, we use mouse models in ketotic nutritional states (24 h of fasting and a very low carbohydrate ketogenic diet) to demonstrate that heart muscle engages a metabolic response that limits ketone body utilization. Pathway reconstruction from microarray data sets, gene expression analysis, protein immunoblotting, and immunohistochemical analysis of myocardial tissu  ...[more]

Similar Datasets

| S-EPMC5989729 | biostudies-literature
| S-EPMC6179903 | biostudies-literature
2010-06-16 | E-GEOD-21368 | biostudies-arrayexpress
| S-EPMC3894218 | biostudies-literature
| S-EPMC2700149 | biostudies-literature
2014-03-31 | E-GEOD-53333 | biostudies-arrayexpress
| S-EPMC6358685 | biostudies-literature
| S-EPMC5752273 | biostudies-literature
| S-EPMC7260802 | biostudies-literature
2010-06-07 | GSE21368 | GEO