Purpose: The relationship between different forms of persistent radiation damage in irradiated cells was investigated in order to identify a common underlying mechanism.
Material And Methods: V-79 Chinese hamster cells were irradiated with different doses of X-rays, neutrons and alpha-particles. In the progeny of surviving cells, up to 4 weeks after irradiation, delayed reproductive death, delayed micronuclei, delayed appearance of dicentric chromosomes and delayed apoptosis were investigated in parallel.
Results: A similar dose-response relationship was found for all endpoints, with a steep rise at low doses to a plateau at doses > 3 Gy. The target for inducing genomic instability by alpha-particles is larger than the nucleus. All chromosomes are equally involved in delayed breakage reunion events.
Conclusion: The results indicate that non-lethal radiation damage to an extranuclear target leads to a persistent increase in clastogenic activity in the surviving irradiated cells.
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