1805-P: Dietary Nitrate Prevents High-Fat Diet-Induced Glucose Intolerance and Liver-Specific Reactive Oxygen Species Emission
Bibliographic record
Abstract
Introduction: The liver is particularly susceptible to the detrimental effects of a high fat diet (HFD), and rapidly develops insulin resistance. While the underlying mechanisms associated with hepatic insulin resistance are not fully understood, mitochondria play a crucial role in regulating lipid metabolism and redox balance. Recently, dietary nitrate was shown to attenuate HFD-induced glucose intolerance, however the mechanism(s) remains unknown. Therefore, in the present study we examined the possibility that dietary nitrate increased mitochondrial lipid-supported respiration and/or attenuated reactive oxygen species (ROS) emission. Methods: Male C57Bl/6J mice (n = 22) were randomly assigned to consume a control diet (10% fat), HFD (60% fat), or HFD with 4mM sodium nitrate in drinking water for 8 weeks. Whole body glucose tolerance and energy expenditure (indirect calorimetry) were determined, and mitochondrial respiration and reactive oxygen species (ROS) emission were assessed in liver samples. Results: Compared to control animals, the consumption of HFD increased whole body fat oxidation and body mass, and induced glucose intolerance. The consumption of dietary nitrate did not affect HFD-mediated changes in energy expenditure, rates of fat oxidation or body mass, but nevertheless attenuated the induction of glucose intolerance. Within the liver, HFD-feeding in the presence or absence of dietary nitrate, did not alter pyruvate or lipid (palmitoyl-CoA) supported respiration, or the sensitivity to malonyl-CoA-mediated inhibition of lipid-supported respiration. In contrast, while HFD increased the endogenous ROS production, nitrate prevented this response. Conclusion: These data demonstrate that nitrate supplementation attenuated the HFD-mediated induction of whole-body glucose intolerance in association with a reduction in ROS emission within the liver. Future research needs to determine causality between these observations. Disclosure G. DesOrmeaux: None. H.L. Petrick: None. H. Brunetta: None. G. Holloway: None. Funding Natural Sciences and Engineering Research Council of Canada (400362)
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.002 |
| Insufficient payload (model declined to judge) | 0.005 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".