Abstract 1107: Transforming growth factor-beta (TGF-β) increases Par-4 expression via activation of Smad and NF-κB in endometrial cancer cells
Bibliographic record
Abstract
Abstract Prostate apoptosis response-4 (Par-4) gene was originally identified in prostate cancer cells undergoing apoptosis. Further studies have shown that Par-4 selectively induces apoptosis in cancer cells without effecting normal cells. Recently it has been evidenced that Par-4 has a tumor suppressor role in endometrial cancer. We have previously demonstrated that TGF-β isoforms are expressed in endometrial tumors and determined cellular fate by regulating apoptosis through the activation of NF-κB. In the present study, we have investigated the mechanisms through which TGF-β isoforms regulate Par-4 expression in endometrial cancer cells. KLE and Hec-1-A endometrial cancer cell lines were used as model in this study. Transcript and protein levels were assessed by reverse transcriptase polymerase chain reaction (RT-PCR) and western blotting, respectively. The results revealed that both cell lines express TGF-β receptor I and receptor II. Blocking TGF-β signalling by neutralizing TGF-β antibody reduced endogenous Par-4 mRNA and protein levels. Exogenous treatment with all the TGF-β isoforms (10ng/ml) upregulated Par-4 mRNA and protein levels. Furthermore, there was increase in the levels of phosphorylated Smad2 and Smad3 in response to TGF-β treatment, thus indicating that Smad pathway was activated by TGF-β isoforms in these cells. However, there was no change in the protein levels of total Smad2/3. TGF-β treatment resulted in rapid phosphorylation of IκB-α with no effect on total IκB-α levels thus suggesting an activation, nuclear translocation and increase in transcriptional activity of NF-κB. Collectively, these results suggest that each TGF-β isoform induces Par-4 levels via the activation of Smad and NF-κB pathway in endometrial cancer cells. Since downregulation of Par-4 is a common event in different types of cancers, we suggest in these cases that TGF-β could be an interesting therapy and strategy to induce Par-4 and apoptosis in endometrial cancer cells. Citation Format: {Authors}. {Abstract title} [abstract]. In: Proceedings of the 102nd Annual Meeting of the American Association for Cancer Research; 2011 Apr 2-6; Orlando, FL. Philadelphia (PA): AACR; Cancer Res 2011;71(8 Suppl):Abstract nr 1107. doi:10.1158/1538-7445.AM2011-1107
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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) | 0.003 | 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".