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A "Failed" Assay Development for the Discovery of Rescuing Small Molecules from the Radiation Damage
Kuo-Kuang Wen1, Stephen Roy2, Isabella M Grumbach2
1University of Iowa High Throughput Screening (UIHTS) Core, University of Iowa, Iowa City, IA, USA.
Abstract:
With improving survival rates for cancer patients, the side effects of radiation therapy, especially for pediatric or more sensitive adult patients, have raised interest in preventive or rescue treatment to overcome the detrimental effects of efficient radiation therapies. For the discovery of rescuing small molecules for radiation damage to the endothelium, we have been developing a 96-well microplate-based in vitro assay for high-throughput compatible measurement of radiation-induced cell damage and its rescue by phenotypic high-content imaging. In contrast to traditional radiation assays with detached cells for clonogenic formation, we observed cells with live-cell imaging in two different kinds of endothelial cells, up to three different cell densities, two gamma-infrared radiation dose rates, more than four different radiation doses, and acute (within 24 h with one to two h intervals) and chronic (up to 7 days) responses by phenotypic changes (digital phase contrast) and functional assays (nuclear, live-cell, and dead-cell staining) at the end of the assay. Multiple potential small molecules, which have been reported for rescuing radiation damage, have been tested as assay controls with dose responses. At the end, we did not move ahead with the pilot screening. The lessons learned from this "failed" assay development are shared.
Insights
Developing a high-throughput assay to find small molecules that rescue radiation damage in endothelial cells is crucial for cancer patient care. This study details the assay development process and lessons learned.
Area of Science:
- Oncology
- Cell Biology
- Radiotherapy
Background:
- Improving cancer survival necessitates mitigating radiation therapy side effects, particularly in sensitive populations.
- Endothelial cells are crucial targets for radiation damage, impacting treatment efficacy and patient outcomes.
- There is a need for effective preventive or rescue treatments against radiation-induced endothelial damage.
Purpose of the Study:
- To develop a high-throughput in vitro assay for measuring radiation-induced endothelial cell damage.
- To identify small molecules capable of rescuing endothelial cells from radiation damage using phenotypic high-content imaging.
- To share insights and lessons learned from the assay development process.
Main Methods:
- A 96-well microplate-based assay was developed for high-throughput screening.
- Live-cell imaging was employed to observe endothelial cells under various radiation doses and conditions.
- Phenotypic changes and functional assays (nuclear, live-cell, dead-cell staining) were used to assess radiation damage and rescue effects.
- Multiple radiation doses, dose rates, cell densities, and time points (acute and chronic) were investigated.
Main Results:
- The assay allowed for the observation of radiation effects on endothelial cells across diverse experimental conditions.
- Dose-response assessments were performed for known radiation-protective small molecules.
- Despite extensive development, the pilot screening phase was ultimately not pursued.
- Valuable lessons were learned regarding assay optimization and limitations.
Conclusions:
- The developed assay provides a robust platform for evaluating radiation-induced endothelial cell damage and potential rescue strategies.
- The insights gained from this assay development are crucial for future high-throughput screening efforts.
- Further refinement is needed before full-scale screening for novel radioprotective agents can commence.
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