Effects of gamma ionizing radiation exposure on Danio rerio embryo-larval stages - comparison with tritium exposure

Beatrice Gagnaire (1) , Caroline Arcanjo (1) , Isabelle Cavalie (1) , Virginie Camilleri (1) , Olivier Simon (1) , Nicolas Dubourg (1) , Magali Floriani (1) , Christelle Adam-Guillermin (2)

1 IRSN/PSE-ENV/SRTE/LECO - Laboratoire d'écotoxicologie des radionucléides
2 IRSN/PSE-SANTE/SDOS/LMDN - Laboratoire de micro-irradiation, de métrologie et de dosimétrie neutrons

The objective was to investigate the effects of ionizing radiation induced in zebrafish early life stages by coupling responses obtained at the molecular (genotoxicity, ROS production, gene expression) and phenotypic (tissue alteration, embryo-larval development) levels. Here we present results obtained after exposure of 3 hpf larvae to 10 days of gamma irradiation at 3.3x101, 1.3x102 and 1.2x103 µGy/h. Dose rates used in these studies were chosen to be in the ‘derived consideration reference level’ (DCRL) for gamma irradiation where deleterious effects can appear in freshwater fish. Also, these dose rates were similar to the ones already tested on tritium (beta ionizing radiation) in our previous work, in order to compare both types of ionizing radiation. Results showed that gamma irradiation did not induce any effect on survival and hatching. No effect was observed on DNA damages, but ROS production was increased. Muscle damages were observed for all tested dose rates, similarly to previous results obtained with tritium (beta ionizing radiation) at similar dose rates. Some molecular responses therefore appeared to be relevant for the study of gamma ionizing radiation effects in zebrafish.

Domaines: Sciences de l'environnement

Beatrice Gagnaire, Caroline Arcanjo, Isabelle Cavalie, Virginie Camilleri, Olivier Simon, et al.. Effects of gamma ionizing radiation exposure on Danio rerio embryo-larval stages - comparison with tritium exposure. Journal of Hazardous Materials, 2021, 408, pp.124866. ⟨10.1016/j.jhazmat.2020.124866⟩. ⟨hal-03155486⟩