Association of Sp3 and estrogen receptor α with the transcriptionally active trefoil factor 1 promoter in MCF‐7 breast cancer cells
Bibliographic record
Abstract
To further explore the role of Sp1 and Sp3 in the estrogen regulated TFF1 gene transcription, chromatin immunoprecipitation (ChIP) assay was used to determine the association of estrogen receptor alpha (ERalpha), Sp1 and Sp3 with the endogenous trefoil factor 1 (TFF1) gene promoter in MCF-7 breast cancer cells. ERalpha and serine 5 phosphorylated RNA polymerase II, the form of RNA polymerase II associated with transcription initiation, were recruited to the TFF1 gene promoter following estrogen addition to MCF-7 cells cultured under estrogen deplete conditions. Both Sp1 and Sp3 were bound to the TFF1 gene promoter before and after estrogen treatment. Using the re-ChIP assay, we demonstrate that either Sp1 or Sp3 but not both bind to a TFF1 promoter. The co-occupancy of ERalpha and Sp1 on TFF1 promoter remains at similar level with and without estrogen, while that of ERalpha and Sp3 increased in the presence of estrogen. Further, we observed increased co-occupancy of Sp3 and serine 5 phosphorylated RNA polymerase II on the TFF1 promoter after estrogen treatment of cells. Taken together, these results provide evidence that Sp3 and ERalpha are involved in the estrogen induced transcription of the TFF1 gene.
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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".