Meconium Enhances the Release of Nitric Oxide in Human Airway Epithelial Cells
Bibliographic record
Abstract
Meconium aspiration syndrome (MAS) is a cause of significant morbidity and mortality in the perinatal period. Despite the clinical relevance of MAS, its pathogenesis is poorly understood and the role played by epithelial-derived metabolites not well defined. In this study, we evaluated whether exposure to meconium affects the release of nitric oxide production in human airway epithelial cells. Monolayers of A549 cells, a transformed human epithelial cell line, were incubated with various concentrations of meconium. Control cells were incubated with serum-free medium in a similar manner. The supernatant fluid was removed at various time points and assayed for nitrite production. In selected experiments, the effects of dexamethasone (10(-6) M), L-nitroarginine methyl ester (L-NAME, 10(-6) M) and indomethacin (10(-6) M) on nitrite release were evaluated. Results were obtained in terms of pmol/mg protein and expressed as % control (mean +/- SE). We found exposure to meconium produced a significant release of nitrite from A549 cells. Dexamethasone, L-NAME and indomethacin inhibited meconium-induced release of nitrite. Our findings demonstrate meconium enhances the production of nitric oxide from A549 cells suggesting that airway epithelial cells and their metabolic products may play an important role in the pathogenesis of MAS.
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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 | 0.000 |
| 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 | 0.001 |
| 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 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".