Abstract 273: Pressure Overload Induces Cardiac Insulin Resistance in an Angiotensin II-Independent Manner
Bibliographic record
Abstract
Aims: Pressure overload is able to provoke the cardiac insulin resistance via angiotensin II (AngII). However, the direct effect of pressure overload on the myocardial insulin sensitivity was poorly understood. This study was aimed to explore whether and how pressure overload impairs myocardial insulin sensitivity independent of AngII. Methods and Results: To mimic cardiac pressure overload, C57BL/6 mice were subjected to transverse aortic constriction (TAC) for 2 weeks in vivo . Cultured neonatal rat cardiomyocytes (NRCMs) were imposed with mechanical stretch for 24 hours in vitro . Although pressure overload dramatically restrained the glucose uptake and expression of glucose transporter 4 (GLUT4) in the myocardial membrane, it didn’t increase the local expression of AngII in TAC mouse hearts and mechanically-stretched NRCMs. C57BL/6 mice were treated with Enalapril and then subjected to TAC for 2 weeks. The glucose uptake and expression of GLUT4 in the myocardial membrane were dramatically restrained in the left ventricles (LVs) of 2 week TAC mice, which were preserved in mice treated with Enalapril. Angiotensinogen knock out ( ATG -/- ) mice were subjected to TAC for 2 weeks. Angiotensin converting enzyme (ACE)-deficient NRCMs were mechanically stretched. Insulin sensitivity was significantly impaired by TAC in ATG -/- mouse hearts and mechanical stretch in NRCMs evidenced by a notably decreased glucose uptake and expression of GLUT4 in myocardial membrane. Pressure overload impaired the myocardial insulin signals including decreased phosphorylation of insulin receptor, insulin receptor substrate 1 and Akt. Candesartan, an AngII receptor 1 (AT1R) blocker, partly attenuated the myocardial insulin resistance induced by mechanical stress in vivo and in vitro . Conclusion: In conclusion, we unraveled that pressure overload is able to provoke myocardial insulin resistance independent of AngII which was partly mediated by AT1R.
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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 | 0.002 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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".