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Characterization of Radioprotective, Radiomitigative and Bystander Signaling Modulating Effects of Endogenous
Dusan Vukmirovic1, Nguyen T K Vo2, Colin Seymour2
1a Radiation Sciences Graduate Program.
Radiation Research
|May 7, 2019
Summary
Phenylacetate and tauroursodeoxycholate show potential as radioprotectors against ionizing radiation when administered before exposure. These natural compounds may help protect stem cell reservoirs from radiation damage, but lack radiomitigative effects.
Area of Science:
- Radiation biology
- Cellular and molecular medicine
- Natural product chemistry
Background:
- Ionizing radiation exposure depletes stem cell reservoirs, leading to chronic injury, cancer, and inflammation.
- Effective radioprotective measures, including oral administration of non-toxic natural products, are crucial for mitigating acute and chronic radiation effects.
- Endogenous metabolites are being investigated for their potential radioprotective and radiomitigative properties.
Purpose of the Study:
- To characterize the radioprotective, radiomitigative, and radiation-induced bystander effect-inhibiting properties of phenylacetate, ursodeoxycholate, and tauroursodeoxycholate.
- To evaluate the efficacy of these compounds when administered pre- and post-irradiation, and in bystander cell experiments.
- To assess the potential of these metabolites in protecting against radiation injury and facilitating recovery.
Main Methods:
- Utilized the clonogenic HCT116 p53 wild-type cancer cell line, chosen for its stem cell-like characteristics and high reproductive viability.
- Employed clonogenic assays to quantify cellular responses to radiation, measuring cell survival via macroscopic colony counts.
- Administered test compounds (phenylacetate, ursodeoxycholate, tauroursodeoxycholate) before and after irradiation, and to donor/recipient bystander flasks.
Main Results:
- Phenylacetate and tauroursodeoxycholate demonstrated statistically significant radioprotective effects when administered prior to irradiation, offering protection up to 2 Gy.
- Administration of these compounds post-irradiation did not confer significant radioprotection.
- No radioprotective effects were observed in bystander experiments, indicating these compounds do not mitigate the radiation-induced bystander effect in vitro.
Conclusions:
- Phenylacetate and tauroursodeoxycholate show promise as effective radioprotectors against ionizing radiation when given before exposure.
- These endogenous metabolites do not exhibit radiomitigative properties, meaning they do not aid in recovery after radiation exposure.
- Further research may explore the therapeutic window and mechanisms of these compounds for radiation protection strategies.
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