Abstract 14243: The Apelin Mimetic Peptide (2Nal) Partially Inhibits the Transient Outward Potassium Current (Ito) in Rat Cardiomyocytes; a Potential Pharmacological Agent Against Brugada Syndrome
Bibliographic record
Abstract
Introduction: Brugada syndrome (BrS) is an inherited disease characterized by ventricular cardiac arrhythmias leading to sudden cardiac death. One potential cause for arrhythmias is a disruption of the balance between the depolarizing fast sodium inward current (I Na ) and its opposing transient outward currents (I to ) favoring a faster repolarization during phase one of the action potential (AP). Hypothesis: BrS is mainly associated with a reduction in I Na amplitude caused by dominant mutations in the gene SCN5A encoding cardiac sodium channels. However, recent studies have shown that gain-of-function mutations in KCND3, the gene encoding Kv4.3 channels, increase I to amplitude. Therefore, targeting I to to modulate the balance of current during phase one of the AP represents a promising therapeutic approach to BrS, Methods: We used Patch-Clamp technique to test the effect of 2Nal, a newly synthesized peptide derived from apelin, on I to in rat ventricular cardiomyocytes. Apelin is an endogenous neurotransmitter with strong inotropic effects on cardiac cells. Results: We found that apelin had no effect on I to . In contrast, 2Nal maximally inhibited 46.9% ± 3.4 (n=9) of I to with an IC 50 =0.29 nM but did not change its kinetics, thus indicating that 2Nal acts as a partial blocker. The voltage dependence of potassium channels availability was not modified, suggesting that 2Nal simply reduced the conductance of each channel contributing to I to . Conclusions: Because of its partial antagonist effect on ITo, 2Nal provide a safety margin that could be potentially useful for the treatment of Brugada syndrome.
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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 | 0.001 |
| 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) | 0.000 | 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".