Prolonged loss of nuclear HMGB1 in neurons following modeled TBI and implications for long-term genetic health
Bibliographic record
Abstract
Under normal physiological conditions high mobility group box protein 1 (HMGB1) stabilizes chromatin, controls transcription, and contributes to DNA repair. Cellular stress or injury results in HMGB1 release from the nucleus acting as a proinflammatory cytokine. The objective of this study was to characterize the temporal progression of nuclear HMGB1 loss up to one week following modeled TBI in 250 g male rats and correlate these changes with the response of DNA damage proteins. HMGB1 was present in the cytoplasm and absent from the nucleus of neurons within 6 h of injury. Quantitative immunohistochemistry and Western blot analysis showed a significant decrease in nuclear HMGB1 expression at 6 and 24 h post-injury compared to controls. Approximately 20 % of neurons were lacking nuclear HMGB1 expression at 7 days post-injury. Cells which were negative for nuclear HMGB1 expression labelled positive for HIF1α, PARP, and γH2AX, indicators of oxidative stress and DNA damage. Nuclear HIF1α expression was detected at 6 h after injury. Nuclear expression of HIF1α, PARP, and γH2AX was observed at 7 days post-injury, suggesting activation of oxidative stress response mechanisms and DNA damage repair pathways. The temporal changes in HMGB1 translocation in conjunction with expression of DNA damage markers suggest a relationship between injury-induced HMGB1 loss in neurons and subsequent DNA damage. These results highlight a potential injury response mechanism with long-term implications in relation to genetic health of surviving neurons.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 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".