Variable Effects of 3 Different Chondroitin Sulfate Compounds on Human Osteoarthritic Cartilage/Chondrocytes: Relevance of Purity and Production Process
Bibliographic record
Abstract
OBJECTIVE: During osteoarthritis (OA), the altered metabolism of cartilage involves proinflammatory factors and matrix metalloprotease (MMP) activity. Studies showed that chondroitin sulfate (CS) may exert a positive effect on the cartilage. Because of differences in CS in terms of purity and the production/purification process, we compared the effects of 3 different types of CS on human OA cartilage. METHODS: Three types of CS were tested: CS1 (porcine, purity 90.4%), CS2 (bovine, purity 96.2%), and CS3 (bovine, purity 99.9%). Treatment with CS at 200 and 1000 microg/ml was performed on human OA cartilage explants in the presence/absence of interleukin 1ss (IL-1ss), and the protein modulations of factors including prostaglandin E(2) (PGE(2)), IL-6, and MMP-1 measured by ELISA. The CS effect on the expression of collagen type II was also investigated on OA chondrocytes using quantitative polymerase chain reaction. RESULTS: In the presence of IL-1ss, CS2 at 1000 microg/ml significantly inhibited IL-6 and PGE(2) production, and CS3 at 200 microg/ml markedly reduced the level of IL-6. CS1 was much less efficient at reducing the catabolic markers and in the absence of IL-1ss, it significantly increased IL-6 and MMP-1. IL-1ss significantly inhibited the gene expression level of collagen type II; only CS3 was able to limit this inhibition. CS1, in the presence or absence of IL-1ss, further markedly decreased collagen type II expression. CONCLUSION: Our data indicate that among the 3 tested CS, CS1 increased production of some catabolic pathways and inhibited the gene expression level of collagen type II. Our study provides new information in the context of prescribing CS for alleviating OA symptoms, as the purity and/or production/purification of the CS compound could orient the current OA disease process toward increased catabolic pathways.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 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) | 0.001 | 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 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".