Abstract 17281: Programmed Necrosis of Ventricular Myocytes During Ischemic Stress Involves a Mitochondrial Regulated Bnip3- RIP-1- Cyclophilin D Signaling Pathway
Bibliographic record
Abstract
Recent animal studies suggest that programmed necrosis plays a critical role in ischemia/reperfusion induced cardiac cell death and in the progression to heart failure. This caspase-independent form of programmed cell death involves RIP1/RIP3 phosphorylation and activation, as well as the formation of the cyclophilin D (CypD)-dependent mitochondrial permeability transition pore (PTP). Our previous work, along with the work of others, suggests that the hypoxia-inducible death gene, Bnip3, may promote a caspase-independent form of cell demise. Therefore, we hypothesized that Bnip3 was capable of triggering programmed necrosis in ventricular myocytes. We demonstrate for the first time that Bnip3-dependent mitochondrial perturbations involving the inner mitochondrial membrane, and cell death, are blocked by the RIP1 inhibitor, necrostatin-1. Furthermore, forced expression of Bnip3 in post-natal cardiac myocytes increased the mitochondrial localization of phospho-RIP3, which was attenuated by deletion of the mitochondrial-targeting transmembrane domain of Bnip3 or in Bnip3-/- cells. In addition, a physical association between Bnip3, RIP1, and CypD by co-immunoprecipitation, was observed in hypoxic myocytes but not normoxic cells, while inhibition of CypD, by cyclosporine A, was sufficient to block Bnip3-induced necrotic-like death. Furthermore, Bnip3 was incapable of inducing PTP opening or cell death in CypD-/- MEFs, despite its ability to interact with RIP1. Thus, our findings implicate CypD as a critical regulator of Bnip3-induced mitochondrial regulated programmed necrosis, and highlight a novel relationship between RIP1- CypD and Bnip3 for programmed necrosis of ventricular myocytes during ischemic injury.
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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 | 0.000 | 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 | 0.000 |
| 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".