Depletion of pulmonary intravascular macrophages partially inhibits lipopolysaccharide-induced lung inflammation in horses
Bibliographic record
Abstract
Horses are unique in their extreme sensitivity to endotoxin-induced cardio-pulmonary shock and mortality. The mechanisms behind increased sensitivity of the horse to endotoxin remain unknown. Pulmonary intravascular macrophages (PIMs) are pro-inflammatory cells occurring in horses. Because the functions of equine PIMs in endotoxemia remain unknown, we studied the role played by equine PIMs in endotoxin-induced pulmonary pathophysiology. We achieved this by using a recently developed protocol to deplete PIMs in order to compare lipopolysaccharide (LPS)-induced pulmonary responses in horses with or without PIMs. Horses treated with gadolinium chloride (GC; 10 mg/kg intravenous) to deplete PIMs or endotoxin-free saline (n = 4) were injected with Escherichia coli LPS (E. coli LPS; 50 ng/kg intravenously) 48 h after GC or saline. Control horses (n = 5) received two injections of endotoxin-free saline at 48 h intervals. All the horses were euthanized 2 h after LPS or saline challenge. Immunohistology for the PIMs showed their reduced numbers in GC-treated horses. The LPS treatment of normal and GC-treated horses increased diastolic and systolic pulmonary arterial pressures at 30 min compared to the saline-treated horses (P < 0.05). However, horses pre-treated with GC did not have an LPS-induced increase in mean pulmonary arterial pressure compared to the LPS-treated horses (P < 0.05). Light and electron microscopic immunocytochemistry detected extensive labeling for LPS in PIMs of LPS-treated horses. Both the LPS-treated groups had more alveolar septal cells positive for TNF-alpha and IL-1beta compared to control horses, which did not receive LPS (P < 0.05). However, GC-treated horses challenged with the LPS showed less IL-1beta-positive cells (P < 0.05). Immuno-electron microscopy localized TNF-alpha and IL-1beta in PIMs. These new data show that PIMs endocytose LPS and contain TNF-alpha and IL-1beta and their depletion partially inhibits LPS-induced pulmonary inflammatory responses.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| 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 | 0.001 |
| 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 source (direct Gemma or distilled Codex), 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".