PROTEINASE-ACTIVATED RECEPTOR 2: POTENTIAL ROLE IN OSTEOARTHRITIC ENTHESEAL PATHOLOGY
Bibliographic record
Abstract
Osteoarthritis (OA) is no longer considered a cartilage-centric disease with remodelling of other joint tissues now recognized. While understudied, entheseal pathology is considered a secondary OA feature. A pivotal role for proteinase-activated receptor 2 (PAR2) in OA has been demonstrated previously in cartilage and subchondral bone at early time points, however the entheseal role of PAR2 has not been reported. OA was induced by destabilization of the medial meniscus (DMM) in wild type (WT) and PAR2 deficient (KO) animals. At 4 weeks and one year post surgery, knee joints were harvested for histological analysis. Medial collateral ligament (MCL) width was measured by 2D planimetry analysis. Immunohistochemistry was used to characterize the MCL and anterior cruciate ligament (ACL). Data were expressed as mean±SEM (n=4–6/group) and analysed using Student9s t-test, with p MCL width increased between 4 weeks and 1 year in WT DMM (0.24 ±0.07 vs 0.40 ±0.008mm respectively, p + cells in addition to IL-33 and histamine. At one year post-surgery, a cellular infiltrate was observed in MCL DMM WT but absent in KO mice. Histological evaluation revealed an absence of F4/80 + cells but the presence of a PAR2 + population, subsequently identified as hypertrophic-like chondrocytes (RUNX2) and chondrocytes-like cells (SOX9). Deletion of PAR2 affords long-term protection against ligament remodelling and demonstrates a critical role for this receptor in both OA joint pathology and ligament injuries. While PAR2 appears to be a credible therapeutic target in OA entheseal pathology, further understanding of the molecular mechanism regulated by this receptor will be required.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 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) | 0.001 | 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".