Impact of Low-level Ionizing Radiation on Cell Death During Zebrafish Embryonic Development

Health Physics
Christina BarrettKara L Cerveny

Abstract

Ionizing radiation (IR) has been linked to multiple types of cellular responses, but its effects on developing organisms are still poorly understood. The authors investigated whether zebrafish embryos exhibit differential responses relative to IR dose and developmental age at time of exposure. Early-stage zebrafish embryos were exposed to different levels of gamma radiation and then, at varying points after irradiation, assayed for morphological defects and levels of cell death. To quantify in vivo cellular responses to low-dose IR exposure and explore how tissue-specific cell functions affect radiation response, apoptotic cells were counted in three regions: the tail, urogenital papilla, and left eye. The authors found that increased gamma radiation doses correlated with increased levels of apoptosis in the developing tail and eye, whereas cells of the urogenital papilla appeared to undergo apoptosis independently of radiation dose. This suggests that the linear-no-threshold model may not be appropriate in all contexts. Grouping embryos by age at IR exposure revealed that gamma radiation exposure resulted in higher levels of apoptosis in embryos irradiated at 2 d post fertilization (dpf), suggesting a radiosensitive stage of d...Continue Reading

References

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Apoptosis

Apoptosis is a specific process that leads to programmed cell death through the activation of an evolutionary conserved intracellular pathway leading to pathognomic cellular changes distinct from cellular necrosis