Abstract
This study investigated the effects of gamma-radiation on Tetrahymena pyriformis. The experimental approach consists of exposing T. pyriformis growing in presence of Cesium-137 (137Cs) at dose rates of 1, 2, 4, and 6 cGy h−1 and Cobalt-60 (60Co) at dose rates of 8, 10, 15, and 20 cGy h−1. The radiation doses effects on growth, morphology, some metabolic enzymes, and reactive oxygen species (ROS) markers have been evaluated. When cells were growing in irradiating conditions at dose rates beyond 4 cGy h−1, a decreasing of cells and generation numbers with a prolongation of generation time and a change of morphological aspect with rounding-off of cells were observed compared to the control. The 50%-inhibitory dose (ID50) for radiation was estimated at 1568.72 ± 158.45 cGy. The gamma-radiation at dose rates more than 6 cGy h−1, affected both glyceraldehyde 3-phosphate dehydrogenase and succinate dehydrogenase by inhibiting their activities. All of these effects were more pronounced when cells were irradiated at the dose rate of 20 cGy h−1 using 60Co source. For ROS markers generated by gamma-radiation in T. pyriformis, the results showed an increase of the lipid peroxidation in cells grown in presence of gamma-radiation at dose rates more than 6 cGy h−1 and an enhancement in catalase and superoxide dismutase activities from the dose rate of 1 cGy h−1. These encouraging results suggested the use of T. pyriformis as a unicellular model cell to investigate other aspects of the response to ionizing radiation.
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Acknowledgements
The authors would like to thank Dr. El Abbadi N, Dr. Moussaif A, Dr. Sbihi Y, Dr. Bouayyadi A, Mr Amaarof M, Mr Moulahid H and Mrs Bellemjid N (CNESTEN, Rabat, Morocco) for their assistance, helpful suggestions and statistical analysis support.
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This work was supported by the National Center for Nuclear Energy, Science and Technology (CNESTEN) as an internal project grant.
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Conceptualization: [AI, AM]; Methodology: [SZ, AI, AM]; Formal analysis and investigation: [SZ, MK, AI]; Writing-original draft preparation: [AI, AM]; Writing-review and editing: [AI, AM]; Funding acquisition: [ME]; Supervision: [ME, AM]. All authors read and approved the final version of the manuscript.
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Ziyadi, S., Iddar, A., Kabine, M. et al. Changes in Growth, Morphology, and Physiology of Tetrahymena pyriformis Exposed to Continuous Cesium-137 and Cobalt-60 Gamma-Radiation. Curr Microbiol 79, 61 (2022). https://doi.org/10.1007/s00284-021-02684-6
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DOI: https://doi.org/10.1007/s00284-021-02684-6