Drug-Disease Interaction: Reduced Verapamil Response in Isoproterenol-Induced Myocardial Injury in Rats
Bibliographic record
Abstract
Inflammation is involved in the pathogenesis of cardiovascular diseases. We investigated whether the response to verapamil is altered in experimental acute myocardial injury (AMI). Two groups of male Sprague-Dawley rats (230-280 g) were divided into control (n = 8) and post-AMI (n = 13). Myocardial injury was induced by 2 daily doses of 150 mg·kg(-1) isoproterenol (ISP). Subcutaneous ECG leads were implanted, and 2 days following the second injection, each rat was dosed with 25 mg·kg(-1) verapamil per os, and an ECG was recorded over 4 h after dosing. The animals were euthanized and blood samples collected for analysis of inflammatory mediators and cardiac troponin I (cTnI). Cardiac L-type calcium channel (Ca(v)1.2) protein levels and mRNA were determined by Western blot and real-time PCR, respectively. ISP treatment caused a 170% increase in serum cTnI, J point elevation, R wave amplitude reduction and Q wave development. Cardiac injury caused a 75% reduction in verapamil potency by prolonging the PR interval and reducing the heart rate. Cardiac tissue injury also caused a significant reduction in the Ca(v)1.2 protein level. Verapamil response was significantly correlated with cTnI. The reduced potency of verapamil in myocardial injury appears to result from a reduction in the drug target protein Ca(v)1.2. If extrapolated to humans, our observations may suggest that downregulation of calcium channel proteins is a contributory factor in the poor outcome in myocardial infarction.
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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 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 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 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 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".