Effects of sparsely and densely ionizing radiation on monocellular green alga chlorella vulgaris
«Radiation and Risk», 2014, vol. 23, No. 4, pp.55-64
Lyapunova E.R., Komarova L.N.Authors
Lyapunova E.R. – Head of Lab., OINPE MEPhI, Obninsk, Russia. Contacts: Studgorodok 1, Obninsk, Kaluga region, Russia, 249040. Tel.: (484) 397-85-39; e-mail:
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Komarova L.N. – Prof., D.Sc., Biol., OINPE MEPhI, Obninsk, Russia.
Abstract
Though relative biological effectiveness (RBE) of different types of ionizing radiation is intensely studied, mechanisms responsible for difference in the relative biological effectiveness are still not clear. Comparative analysis of effects of sparsely and densely ionizing radiation on monocellular green alga Chlorella vulgaris is presented in the paper. It is shown that survival curves of cells exposed to both types of radiation have exponential shape. In contrast to Chlorella cells, survival curves of other studied biological objects exposed to sparsely ionizing radiation have sigmoid shape. The death of both the alga cells and other objects from exposure to α-particles is significantly higher than after delivery the same dose of sparsely ionizing radiation. Chlorella vulgaris cells have several modes of radiation induced cell death, such as interphase death, apoptosis and necrosis, observed before cells division or after several cell division cycles. If doses of exposure of cells in log to both types of radiation are isoeffective, the number of interphase cell death caused by exposure of log-phase cells to alpha-particles is twofold higher than after gamma-radiation, the ratio is 1.5 for stationary-phase cells. Results of the study will improve understanding of mechanisms of eukaryotic cells inactivation induced by ionizing radiation with different LET.
Key words
γ-radiation, α-particles, LET, Chlorella vulgaris, relative biological effectiveness (RBE), inactivation of cells, modes of cell death, survival curve, logarithmic stage of growth, stationary phase of growth, apoptosis, necrosis.
References
1. Kapultcevich Yu.G. Quantitative principles of radiation damage to the cells. Moscow, Atomizdat, 1978. 230 p. (In Russian).
2. Korogodin V.I. Forms inactivation of yeast cells to ionizing radiation. Biofizika – Biophysics, 1958, vol. 3, no. 2, pp. 206-214. (In Russian).
3. Kapultcevich Yu.G., Korogodin V.I., Petin V.G. Analysis of radiobiological reactions of yeast cells. Radiobiologiya – Radiobiology, 1972, vol. 12, no. 2, pp. 267-274. (In Russian).
4. Korogodin V.I. Problems of post-radiation recovery. Moscow, Atomizdat, 1966. 391 p. (In Russian).
5. Krasavin Е.А. Problems RBE and DNA repair. Noscow, Energoatomizdat, 1989. 192 p. (In Russian).
6. Petin V.G., Kabakova N.M. Comparative study of RBE and radiation yeast cells in various stages of growth. Radiobiologiya – Radiobiology, 1977, vol. 17, no. 1, pp. 31-36. (In Russian).
7. Govorun R.D., Smirnova O.A., Ryzhov N.I. Effect of heavy ions in mammalian cells. Message 2. Assessment of RBE accelerated ions of helium, carbon and neon by cytogenetic indices. Radiobiologiya – Radiobiology, 1982, vol. 22, no. 6. pp. 791-794. (In Russian).
8. Barendsen G.W. The relationships between RBE and LET for different types of lethal damage in mammalian cells: biophysical and molecular mechanisms. Radiat. Res., 1994, vol. 139, no. 4, pp. 257-270.
9. Brooks A.L., Newton G.J., Shyr L.J. The combined effects of a-particles and X-rays on cell killing and micronuclei induction in lung epithelial cells. Int. J. of Radiat. Biol., 1990, vol. 58, pp. 799-811.
10. Nagasawa H. Response of X-ray-sensitive CHO Mutant Cells to radiation. II. Relationship between cell survival and the induction chromosomal damage with low doses of a-particles. Radiat. Res., 1991, vol. 126, pp. 280-288.
11. Bychkovskaya I.B. The problem of distant radiation cell death. Moscow, Energoatomizdat, 1986. 160 p. (In Russian).
12. James A.P. Lethal sectoring in yeast. Genetics, 1973, vol. 73, pp. 165-166.
13. Dertinger H., Jung H. Molecular radiation biology. Berlin, Springer-Verlag, 1970. 250 p.
14. Shevchenko V.A. Radiation genetics of unicellular algae. Moscow, Science, 1979. p. 256. (In Russian).
15. Vekshina L.I., Kogan I.G., Kudryashov E.I., Marenny A.N., Pjatyshev D.R., Sakovich I.S., Shevchenko V.A. The relative biological effectiveness of heavy ions in a single exposure of Chlorella. Kosmicheskaya Biologiya i Meditsina – Space Biology and Medicine, 1970, vol. 5, pp. 39-42. (In Russian).
16. Shevchenko V.A., Vizgin V.P., Alexeenok A.Ya. About the mutation process in populations of unicellular algae in acute and chronic exposure to ionizing radiation. Genetika – Genetics, 1969, vol. 9, no. 5, pp. 61-73. (In Russian).
17. Evseeva T.I., Maistrenko T.A., Geras'kin S.A., Belykh E.S. Mechanisms of action of 232Th and Ce (III) on Chlorella vulgaris Beijer. Assessment of the contribution of radiation exposure 232Th in the induced effect. Radiatsionnaya biologiya. Radioekologiya – Radiation biology. Radioecology, 2008, vol. 48, pp. 370-377. (In Russian).
18. Wong M.H. Effects of cobalt and zinc to Chlorella pyrenoidosa in soft and hard water. Microbiosis., 1980, vol. 28, pp. 19-25.
19. Shevchenko V.A., Abramov V.I., Kalchenko V.A., Fedotov V.S., Rubanovich A.V. Genetic consequences for plant populations of radioactive contamination of the environment after the Chernobyl accident. Radiatsionnaya biologiya. Radioekologiya – Radiation Biology. Radioecology, 1996, vol. 36, pp. 531-545. (In Russian).
20. PND F T 14.1:2:3:4.10-2004. Toxicological analysis methods. The method of determining the toxicity of drinking water and waste water, water extracts from soils, sewage sludge and waste of production and consumption on the change in optical density of the culture of algae Chlorella vulgaris Beijer. (In Russian).
21. Dudchenko T.M. Joint action of ionizing radiation and heavy metals on mice fibroblasts in culture. Cand. biol. sci. diss. synopsis. PhD biol. Kyiv, 2001. 20 p.