Presenilin-1 Mutations Increase Levels of Ryanodine Receptors and Calcium Release in PC12 Cells and Cortical Neurons
Why this work is in the frame
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Bibliographic record
Abstract
Many cases of early-onset inherited Alzheimer's disease (AD) are caused by mutations in the presenilin-1 (PS1) gene. PS1 mutations may perturb cellular Ca(2+) homeostasis and thereby render neurons vulnerable to excitotoxicity and apoptosis. We now report that PC12 cells expressing PS1 mutations and primary hippocampal neurons from PS1 mutant knockin mice exhibit greatly increased levels of ryanodine receptors (RyR) and enhanced Ca(2+) release following stimulation with caffeine. Double-labeling immunostaining and co-immunoprecipitation analyses indicate that PS1 and RyR are colocalized and interact physically. Caffeine treatment sensitizes neurons expressing mutant PS1 to apoptosis induced by amyloid beta-peptide, a neurotic peptide linked to the pathogenesis of AD. When taken together with recent evidence for alterations in RyR in brains of AD patients, our data suggest that PS1 mutations may promote neuronal degeneration in AD by increasing transcription and translation of RyR and altering functional properties of ryanodine-sensitive Ca(2+) pools.
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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 | 0.002 |
| 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 | 0.001 |
| 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 it