Enhanced Expression of Alpha-Fetoprotein Gene in Cultured Rat Liver Epithelial Cells Treated with N-Methyl-N’-Nitro-N-Nitrosoguanidine
Why this work is in the frame
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Bibliographic record
Abstract
The expression of alpha-fetoprotein (AFP) gene in a cultured normal rat liver epithelial cell line (WB-F344) and its chemical carcinogen-treated clonal derivatives was examined. WB-F344 cells expressed low levels of AFP and albumin mRNAs. Clonal cell strains and tumor cell lines derived from WB-F344 cells which had been treated multiple times with N-methyl-N'-nitro-N-nitrosoguanidine (MNNG) showed heterogeneous levels of expression of AFP mRNA. Enhanced expression was seen in 8 of 18 (44%) cell strains/lines which expressed high gamma-glutamyltranspeptidase (GGT) activity, and in 4 of 6 (67%) of GGT-negative cell strains/lines. Southern blot analyses of DNAs after digestion by HpaII endonuclease indicated that MNNG-treated cells frequently showed hypomethylation of the AFP gene. Tumor cell lines derived from WB-F344 cells which were transformed by a single treatment with MNNG consistently expressed higher levels of AFP mRNA than tumor cell lines derived from spontaneously transformed WB-F344 cells. These results suggest that enhanced expression of AFP in MNNG-treated cultured rat liver epithelial cells may be related to the effect of treatment with this carcinogen, which is known to induce DNA hypomethylation.
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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 it