The role of the chitinase3-like protein HC-gp39 in connective tissue physiology and pathology /
Bibliographic record
Abstract
We report that the chitinase-like protein, human cartilage glycoprotein 39 (HC-gp39) is a growth and survival factor. It promotes connective tissue cell survival and growth, and counteracts catabolic processes. Dose-dependent growth stimulation was observed when human synoviocytes and fibroblasts were exposed to HC-gp39. Both the ERK1/2 MAP kinase and the PI3 kinase pathways were activated by HC-gp39. Thus HC-gp39 elicits a signaling cascade leading to increased connective tissue cell proliferation, suggesting that HC-gp39 may play a major role in the pathological conditions leading to tissue fibrosis. In addition to acting as a mitogen, HC-gp39 also reduces stress-induced apoptosis in human connective tissue cells. HC-gp39 significantly inhibited H2 O2 activation of SAPK/JNK and p38 in chondrocytes. A reduction of caspase-3 activation, poly(ADP-ribose) polymerase (PARP) cleavage and apoptotic cell number was also seen. These results suggest that HC-gp39 plays an important role in the survival of connective tissue cells. The protective effect is further illustrated by the ability of HC-gp39 to reduce cellular responses to inflammatory cytokines. IL-1 or TNF-alpha stimulated phosphorylation of SAPK/JNK and p38 were greatly reduced by HC-gp39. Signalling through the NF-kappab pathway was unaffected. These actions resulted in a significant reduction of MMP1, MMP3, MMP13 and IL-8 production, suggesting that HC-gp39 can participate in the catabolic aspects of tissue remodelling as a repair or protecting factor counteracting the catabolic processes. Although HC-gp39 affected the response to IL-1 and TNF-alpha, these cytokines had no effect on the high expression level of HC-gp39 in chondrocytes cultures. However, inhibition of the NF-B signalling pathway, which has been implicated as a major effectory mechanism for TNF-alpha, significantly decreased HC-gp39 protein and mRNA levels in a concentration and time dependent manner. Increased NF-kappaB
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| 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".