Analysis of Responses to St. John's Wort in the Feline Pulmonary Vascular Bed
Bibliographic record
Abstract
OBJECTIVE: To test the hypothesis that St. John's wort induces a depressor response in the feline pulmonary vascular bed and identify the pathways involved in the mediation or modulation of these effects. DESIGN: Prospective vehicle controlled study. SETTING: University research laboratory. SUBJECTS: Intact chest preparation; adult mongrel cats. INTERVENTIONS: In separate experiments, the effects of L-N5-(1-Iminoethyl) ornithine hydrochloride (L-NIO), a nitric oxide synthase inhibitor, glibenclamide, an ATP-sensitive K+ channel blocker, meclofenamate, a non-selective cyclo-oxygenase (COX) inhibitor, nicardipine, a calcium channel blocker, bicuculline, a GABAA receptor antagonist, and saclofen, a GABAB antagonist, were investigated on pulmonary arterial responses of St. John's wort (SJW), pinacidil, an ATP-sensitive K+ channel activator, bradykinin, an inducer of nitric oxide synthase, 3-aminopropyl (methyl) phosphinic acid, hydrochloride (SKF-97541), a GABAB receptor agonist and muscimol, a GABAA receptor agonist. MEASUREMENTS AND MAIN RESULTS: Lobar arterial perfusion pressure and systemic pressure were continuously monitored, electronically averaged and permanently recorded. Under elevated tone conditions in the isolated left lower lobe vascular bed of the cat, SJW induced a dose-dependent vasodepressor response that was not significantly altered after administration of L-NIO, glibenclamide, meclofenamate or saclofen. Responses to SJW were significantly reduced after administration of either nicardipine or bicuculline. When the calcium channel blocker nicardipine was administered in addition to the GABA blocker bicuculline, there was near complete attenuation of the SJW-induced vasodepressor responses. CONCLUSIONS: The results of the present study suggest that SJW has potent vasodepressor activity in the pulmonary vascular bed of the cat and that this response is mediated or modulated by both a calcium channel and GABA receptor sensitive pathway.
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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 | 0.002 |
| 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 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".