Versican expression and turnover in hepatic stellate cell activation
Bibliographic record
Abstract
The pathophysiologic processes of extracellular matrix deposition and turnover in liver injury are central to our understanding of liver fibrosis and the development of antifibrotic therapies. Here we report expression of versican and the proteoglycan degrading enzymes ADAMTS1 and 4 by hepatic stellate cells (HSCs) activated to a myofibroblastic phenotype in tissue culture. HSCs were isolated from C57B/6 mice by pronase/collagenase digestion and density gradient centrifugation and activated by culture on plastic. Versican expression was detected in HSCs at all stages of activation in culture. Expression increased gradually from days 1 through to 7, then more dramatically, up to 5 fold, by days 10 and 14. Immunofluorescence microscopy confirmed versican production by activated HSCs. Western blotting of activated HSC media demonstrated secretion of both intact versican and versican proteolytic products. Expression of the known versican processing enzymes, ADAMTS1 and 4, was detected at all time points but was suppressed during early stages of HSC activation (days 2 through 7) relative to day 1 levels. Versican synthesis and turnover appear to be important components of HSC activation. Its regulated turnover may play a role in modulating normal and fibrotic remodeling in the liver. The reduction in ADAMTS expression could contribute to the deposition of a versican rich matrix in which tissue remodeling occurs. Grant Funding Source : Northern Medical Program
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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".