Acquisition of plasmin activity and induction of arachidonic acid release by<i>Streptococcus suis</i>in contact with human brain microvascular endothelial cells
Bibliographic record
Abstract
Infections caused by Streptococcus suis, a major swine pathogen, include meningitis, arthritis, pneumonia and septicaemia. In this study, we investigated interactions that may occur between human brain microvascular endothelial cells (HBMEC), the main constituent of the blood-brain barrier, and S. suis. We show that S. suis acquires plasmin activity in a time-dependent manner when in contact with cultured HBMEC. Cell-associated plasmin activity reached a plateau following a 48h co-incubation period. Zymography analysis revealed that HBMEC produce urokinase, which is probably involved in activation of plasminogen bound to S. suis. We also show that a S. suis culture supernatant which possesses both phospholipase C and haemolysin (suilysin) activities was able to induce the release of arachidonic acid from the membrane of HBMEC. Evidence suggests that the action of suilysin on HBMEC may be a prerequisite for the action of additional molecules such as phospholipase C. These new biological effects associated with S. suis may play an important role in the migration of S. suis through the blood-brain barrier and in the modulation of local inflammation.
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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 | 0.000 | 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 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".