Analysis of cartilage biomarkers in the early phases of canine experimental osteoarthritis
Bibliographic record
Abstract
OBJECTIVE: To study 3 body fluids for changes in the levels of 5 biomarkers of cartilage metabolism during the early phases of experimental osteoarthritis (OA). METHODS: Twenty skeletally mature mixed-breed canines underwent unilateral surgical transection of the anterior cruciate ligament. Samples of joint fluid, serum, and urine were obtained preoperatively and just before necropsy (3 weeks or 12 weeks postoperatively). Biomarkers included 2 markers of cartilage matrix synthesis/turnover (aggrecan 846 epitope and C-propeptide of type II collagen) and 3 markers of cartilage degradation (keratan sulfate proteoglycan epitope, the collagenase-generated cleavage epitope of type II collagen [Col2-3/4C(long mono), or CIIC], and crosslinked peptides from the C-telopeptide domain of type II collagen [Col2CTx]). Significant changes in the levels of these biomarkers were determined by paired analyses. RESULTS: Joint pathology was more severe in the 12-week group compared with the 3-week group. In joint fluid, due to limited volume, only Col2-3/4C(long mono) and Col2CTx were measured. Significant elevations in the levels of both of these markers were observed in experimental joints in both the 3-week group and the 12-week group. In serum, the level of aggrecan 846 epitope was elevated at both 3 weeks and 12 weeks, the level of Col2-3/4C(long mono) was elevated at 12 weeks, and the level of Col2CTx was elevated at both 3 weeks and 12 weeks. In urine, the level of Col2-3/4C(long mono) was elevated at 12 weeks after surgery. CONCLUSION: Levels of biomarkers of intact aggrecan proteoglycan (aggrecan 846 epitope) and type II collagen degradation (Col2-3/4C(long mono) and Col2CTx) were elevated early after unilateral stifle joint injury, suggesting that these markers are sensitive and specific for early cartilage changes associated with isolated joint injury in this established model of experimental OA.
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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) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| 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".