1
|
Huumonen K, Korkalainen M, Boman E, Heikkilä J, Höytö A, Lahtinen T, Luukkonen J, Viluksela M, Naarala J, Juutilainen J. Dose- and time-dependent changes of micronucleus frequency and gene expression in the progeny of irradiated cells: two components in radiation-induced genomic instability? Mutat Res 2014; 765:32-39. [PMID: 24797401 DOI: 10.1016/j.mrfmmm.2014.04.010] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2013] [Revised: 04/11/2014] [Accepted: 04/12/2014] [Indexed: 06/03/2023]
Abstract
Murine embryonic C3H/10T½ fibroblasts were exposed to X-rays at doses of 0.2, 0.5, 1, 2 or 5 Gy. To follow the development of radiation-induced genomic instability (RIGI), the frequency of micronuclei was measured with flow cytometry at 2 days after exposure and in the progeny of the irradiated cells at 8 and 15 days after exposure. Gene expression was measured at the same points in time by PCR arrays profiling the expression of 84 cancer-relevant genes. The micronucleus results showed a gradual decrease in the slope of the dose-response curve between days 2 and 15. The data were consistent with a model assuming two components in RIGI. The first component is characterized by dose-dependent increase in micronuclei. It may persist more than ten cell generations depending on dose, but eventually disappears. The second component is more persistent and independent of dose above a threshold higher than 0.2 Gy. Gene expression analysis 2 days after irradiation at 5 Gy showed consistent changes in genes that typically respond to DNA damage. However, the consistency of changes decreased with time, suggesting that non-specificity and increased heterogeneity of gene expression are characteristic to the second, more persistent component of RIGI.
Collapse
Affiliation(s)
- Katriina Huumonen
- University of Eastern Finland, Department of Environmental Science, P.O. Box 1627, 70211 Kuopio, Finland
| | - Merja Korkalainen
- National Institute for Health and Welfare, Department of Environmental Health, P.O. Box 95, 70701 Kuopio, Finland
| | - Eeva Boman
- Kuopio University Hospital, Cancer Center, P.O. Box 1777, 70211 Kuopio, Finland
| | - Janne Heikkilä
- Kuopio University Hospital, Cancer Center, P.O. Box 1777, 70211 Kuopio, Finland
| | - Anne Höytö
- University of Eastern Finland, Department of Environmental Science, P.O. Box 1627, 70211 Kuopio, Finland
| | - Tapani Lahtinen
- Kuopio University Hospital, Cancer Center, P.O. Box 1777, 70211 Kuopio, Finland
| | - Jukka Luukkonen
- University of Eastern Finland, Department of Environmental Science, P.O. Box 1627, 70211 Kuopio, Finland
| | - Matti Viluksela
- National Institute for Health and Welfare, Department of Environmental Health, P.O. Box 95, 70701 Kuopio, Finland
| | - Jonne Naarala
- University of Eastern Finland, Department of Environmental Science, P.O. Box 1627, 70211 Kuopio, Finland
| | - Jukka Juutilainen
- University of Eastern Finland, Department of Environmental Science, P.O. Box 1627, 70211 Kuopio, Finland.
| |
Collapse
|
2
|
Andreev SG, Eidelman YA, Salnikov IV, Slanina SV. Modeling study of dose-response relationships for radiation-induced chromosomal instability. DOKL BIOCHEM BIOPHYS 2013; 451:171-5. [PMID: 23975393 DOI: 10.1134/s1607672913040017] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2012] [Indexed: 11/23/2022]
Affiliation(s)
- S G Andreev
- Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, ul. Kosygina 4, Moscow, 119334, Russia
| | | | | | | |
Collapse
|