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A high-throughput screen for alpha particle radiation protectants.

Jonathan H Seideman1, David Shum, Hakim Djaballah

  • 1Molecular Pharmacology and Chemistry Program, Memorial Sloan-Kettering Cancer Center, New York, New York 10065, USA.

Assay and Drug Development Technologies
|July 28, 2010
PubMed
Summary

A new high-throughput screening assay identified epoxy-4,5-α-dihydroxysantonin (EDHS) as a potential protector against alpha particle radiation toxicity. This discovery validates a novel method for finding radioprotective compounds against alpha particle damage.

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Area of Science:

  • Radiobiology
  • Toxicology
  • Drug Discovery

Background:

  • Alpha particle radiation poses risks as environmental/occupational carcinogens and in radiation accidents.
  • Alpha particles cause DNA damage via direct action, limiting the efficacy of traditional radical scavengers.
  • Oncology utilizes alpha particle-emitting radioisotopes for targeted cancer therapy.

Purpose of the Study:

  • To develop a high-throughput screening (HTS) assay for identifying novel compounds protecting mammalian cells from alpha particle radiation.
  • To screen a library of 3,119 compounds using the alpha-emitter ²²⁵Ac.
  • To discover compounds that mitigate alpha particle toxicity through mechanisms distinct from radical scavenging.

Main Methods:

  • Developed a robust and reproducible assay monitoring myeloid leukemic cell line viability after alpha particle exposure.
  • Utilized ²²⁵Ac as the alpha particle source in a pilot high-throughput screen (HTS) of 3,119 compounds.
  • Assay validation demonstrated a Z' factor of 0.66 and a signal-to-noise ratio of nearly 10:1.

Main Results:

  • Identified one compound, epoxy-4,5-α-dihydroxysantonin (EDHS), exhibiting significant protective activity against alpha particle exposure.
  • The identified compound suggests potential for novel protective mechanisms beyond radical scavenging.
  • The HTS methodology proved effective and validated for discovering alpha particle protective agents.

Conclusions:

  • The developed HTS assay is a validated tool for discovering novel radioprotective compounds against alpha particle toxicity.
  • Epoxy-4,5-α-dihydroxysantonin (EDHS) is a promising lead compound for further investigation into alpha particle mitigation.
  • Further application of this assay could identify agents to reduce alpha particle-induced toxicity and carcinogenesis.