Interaction of 5-aza-2′-deoxycytidine and depsipeptide on antineoplastic activity and activation of 14-3-3σ, E-cadherin and tissue inhibitor of metalloproteinase 3 expression in human breast carcinoma cells
Why this work is in the frame
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Bibliographic record
Abstract
Genes that suppress tumorigenesis can be silenced by epigenetic events, such as aberrant DNA methylation and modification of chromatin structure. Inhibitors of DNA methylase and histone deacetylase (HDAC) can potentially reverse these events. The aim of this study was to determine the in vitro antineoplastic activity of 5-aza-2'-deoxycytidine (5-AZA-CdR), a potent inhibitor of DNA methylase, in combination with depsipeptide (depsi), an inhibitor of HDAC, on human breast carcinoma cells. We observed a synergistic antineoplastic interaction between 5-AZA-CdR and depsi in their capacity to inhibit colony formation of Hs578T and MCF-7 breast carcinoma cells. In order to understand the molecular mechanism of this interaction, we investigated the effect of these drugs on the activation of the 14-3-3sigma, E-cadherin and tissue inhibitor of metalloproteinase 3 (TIMP3) cancer-related genes, which were reported to be silenced by aberrant methylation in many breast tumor cell lines. 14-3-3sigma was reported to produce G cell cycle arrest following DNA damage. E-cadherin and TIMP3 function as suppressors of tumor metastasis. Semi-quantitative RT-PCR was used to determine the effect of the co-administration of 5-AZA-CdR and depsi on four breast carcinoma cell lines for the reactivation of these genes. We observed a synergistic activation of E-cadherin by the combination in Hs578T, MDA-MB-231 and MDA-MB-435 tumor cells. For 14-3-3sigma, we demonstrated an additive to synergistic activation by the combination for Hs578T and MDA-MB-435 tumor cells, respectively. In the MCF-7 tumor cells, the drug combination produced a synergistic activation of TIMP3. The association between the synergistic antineoplastic activity and the synergistic activation of the target genes in this study suggests that the mechanism of anticancer activity of 5-AZA-CdR, in combination with depsi, is probably related to their enhanced activation of different types of tumor suppressor genes that have been silenced by epigenetic events.(2)
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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