Transforming Growth Factor-β1 Drives Airway Remodeling in Cigarette Smoke–Exposed Tracheal Explants
Why this work is in the frame
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Bibliographic record
Abstract
Small airway remodeling (SAR) is an important cause of airflow obstruction in cigarette smokers, but whether SAR represents a response to smoke-evoked inflammation or is directly mediated by smoke-induced growth factor production is disputed. To examine this process, we exposed rat tracheal explants, a model free of exogenous inflammatory cells, to cigarette smoke in vitro. Cigarette smoke caused release of active transforming growth factor (TGF)-beta1, and this was prevented by the oxidant scavenger tetramethythiourea. Nuclear immunostaining for phospho-Smad2, a TGF-beta downstream signaling molecule, was present in epithelial and interstitial cells within 1 h after exposure. Smoke caused upregulation of gene expression of connective tissue growth factor (CTGF), a mediator of TGF-beta fibrogenic effects, within 2 h, and upregulation of procollagen gene expression at 24 h; both changes could be prevented by the TGF-beta antagonist fetuin (alpha2-HS-glycoprotein). In a cell-free system, recombinant human TGF-beta latency-associated peptide was oxidized by cigarette smoke, and smoke released active TGF-beta1 from recombinant latent TGF-beta1 via an oxidant mechanism. These experiments suggest that SAR in cigarette smokers may be caused by direct, smoke-mediated, oxidant-driven induction of growth factor signaling in the airway wall, and that SAR does not necessarily require exogenous inflammatory cells.
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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 | 0.000 |
| 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 it