Evidence of Hepatic Glucagon Resistance Associated with Hepatic Steatosis: Reversal Effect of Training
Bibliographic record
Abstract
The present study was undertaken to test the hypothesis that a high-fat diet-induced hepatic steatosis is associated with a reduction in hepatic glucose output (HGO) in response to a hyperglucagonemic infusion, and that this postulated state of hepatic glucagon resistance in high-fat fed rats is attenuated by concurrent exercise training. In four groups of anesthetized rats, glucagon (2 ug/kg/min iv) was infused over a period of 60 min to measure HGO. Two groups of rats were either fed a standard (SD) or a high-fat (HF; 42 % kcal) diet for eight weeks and were assigned either to a Sedentary (Sed) or a treadmill-trained (TR) group. Training was initiated two weeks after the beginning of the diet protocol and was progressively increased over a period of 6 weeks reaching 60 min at 26 m/min, 10 % grade, for the last 3 weeks. The HF compared to the SD diet resulted in approximately 28 % higher (p < 0.01) liver triglyceride levels in Sed rats. This increase was completely prevented by the exercise training program in the HF-TR group. Plasma glucagon ( approximately 90,000 pg/ml) and insulin ( approximately 500 pmol/l) levels were increased to a similar extent in all four groups, with the exception of higher (p<0.05) insulin levels in SD-Sed group. Glucagon induced-hyperglycemia ( approximately 300 mg/dl) was higher (p<0.05) in the SD-Sed than in HF-Sed and SD-TR groups. Glucagon infusion resulted in a significantly (p<0.05) lower increase ( approximately 35 %) in HGO in HF-Sed compared to SD-Sed group. The lower level of HGO in HF-Sed compared to SD-Sed rats was observed whether HGO was measured after 25, 40, or 60 min of glucagon infusion. Exercise training in HF fed rats resulted in a significant (p<0.05) attenuation (50 %) of the state of HF-induced glucagon resistance. Comparisons of all individual liver triglyceride and 60-min HGO values revealed that liver triglyceride values were highly (p<0.001) predictive of the decreased glucagon action on HGO (R= -0.849). The present results indicate that the feeding of a high-fat diet induces a state of hepatic glucagon resistance, which is partially attenuated by concurrent exercise training. It is suggested that liver lipid infiltration may interfere with the action of glucagon, thus inducing glucagon resistance in liver.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
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 teacher head, 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".