Examining the non-homologous repair process following cisplatin and radiation treatments
Bibliographic record
Abstract
PURPOSE: To investigate the extent of non-homologous end-joining (NHEJ) in the mechanism of cisplatin radiosensitization. MATERIALS AND METHODS: Ku80-deficient cells are deficient in the non-homologous DNA double-strand break repair process, while the wild-type MEF cells maintain full mammalian cell repair capabilities. Both cell lines were exposed to clinically applicable doses of cisplatin (1, 3 and 6 microg x ml(-1)) for 1 h immediately before exposure to 250 kV X-rays. Radiation responses were plotted for each cell line and for all doses of cisplatin to observe relative levels of radiosensitization. Split-dose experiments were also performed on each cell line to measure levels of sublethal damage repair. RESULTS: Radiosensitization was observed in the wild-type cells but not in the Ku80 cells when treated with a combination of 1 microg x ml(-1) cisplatin followed by X-rays, implying that the NHEJ pathway may play a large role in cisplatin radiosensitization. Concurrent administration of this cisplatin dose with radiation produced similar levels of radiosensitization. Conversely, 3 and 6 microg x ml(-1) cisplatin applied immediately before radiation revealed an increasing resistance to radiation in both cell lines--possibly due to resistant subpopulations of cells remaining after subsequent lethal doses of cisplatin. Further experiments revealed that the high concentrations of cisplatin did not alter cell cycle distribution. Finally, split-dose experiments revealed that the NHEJ pathway also plays a significant role in sublethal damage repair. CONCLUSIONS: The study reveals that clinically applicable doses of cisplatin treatment results in the radiosensitization of mammalian cells due to the inhibition of the operation of NHEJ.
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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".