Oxidative Stress Mediates the Trasnformation of Rodent Hepatic Stellate Cells to Myofibroblasts in Culture
Bibliographic record
Abstract
HSC are heterogeneous regarding the expression of Hedgehog (Hh) and Wnt, pathways activated during development. Also, the Hh pathway is up‐regulated during HSC activation ( Lab Invest 2005, 85:1368–80). We now investigated expression of the Hh and Wnt pathways during HSC activation in culture. Activation of HSC is reversible when cells of early passages are stored in liquid N2, as when re‐plated, mRNA levels of PDGF‐β and α‐SMA are very low but are up‐regulated with a maximum increase by 5 days. This increase is blunted by catalase and N‐acetylcysteine. HSC activation is also accompanied by upregulation of mRNAs for the Wnt pathway members N‐cadherin, β‐catenin, GSK 3β and lymphoid enhancer factor, events that are reproduced by PDGF‐BB. ROS production and expression of α‐SMA mRNA by cultured HSC obtained from Rac‐transgenic mice are elevated as compared to control HSC. Rac HSC have increased Hh activity as evidenced by increased transcription of Patched, and overexpression of Smoothened and Gli2/3. These findings establish a direct connection between ROS and HSC activation. We propose that differentiation and not activation should be used to define the transformation of HSC to myofibroblasts. RO1 AA 10541 (MR) and RO1 AA10154 (AMD).
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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 | 0.000 | 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 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 0.001 |
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".