Ectonucleotidase NTPDase2 Is Selectively Down-Regulated in Biliary Cirrhosis
Bibliographic record
Abstract
BACKGROUND: Portal fibroblasts are newly identified, potentially fibrogenic liver cells that are distinct from hepatic stellate cells. The ectonucleotidase* nucleoside triphosphate diphosphohydrolase 2 (NTPDase2) is restricted to portal fibroblasts in the normal liver. However, the fate of NTPDase2 after bile duct ligation (BDL) is unknown. AIMS: The aim of this study was to assess the effect of experimental rat and disease-mediated human biliary cirrhosis on NTPDase2 expression in the liver. METHODS: Cirrhosis was induced in experimental rats via BDL and carbon tetrachloride (CCl4) administration. Archived human liver biopsy specimens from normal liver, primary biliary cirrhosis, or hepatitis C cirrhosis were examined. Changes in expression of NTPDase2 were determined using confocal immunofluorescence, immunoblot, and real-time polymerase chain reaction. RESULTS: Confocal immunofluorescence demonstrated a decrease in NTPDase2 expression after BDL. Immunoblot and real-time polymerase chain reaction demonstrated a decrease in NTPDase2 expression by portal fibroblasts after BDL. No decrease in NTPDase2 protein was noted after CCl4 administration, and NTPDase2 messenger ribonucleic acid was markedly up-regulated after CCl4 administration. Confocal immunofluorescence demonstrated a shift of NTPDase2 expression from portal areas to central areas that colocalized with alpha-smooth muscle actin after CCl4 administration. In human biopsy specimens, NTPDase2 expression was lost in cirrhosis owing to primary biliary cirrhosis, whereas NTPDase2 expression was shifted to bridging fibrous bands in cirrhosis owing to hepatitis C. CONCLUSIONS: Loss of NTPDase2 is a common pathway in both rat and human manifestations of biliary cirrhosis. Conversely, in non-biliary cirrhosis, NTPDase2 is shifted from the portal area to bridging fibrous bands. Elucidations of the mechanisms regulating NTPDase2 expression may lead to new therapeutic approaches to fibrotic liver disease.
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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 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".