Regulation of Apoptosis and Cell Cycle in Irradiated Mouse Brain.
- Author:
Won Yong OH
1
;
Mi Hee SONG
;
Eun Ji CHUNG
;
Jin Sil SEONG
;
Chang Ok SUH
Author Information
1. Department of Therapeutic Radiology, National Medical Center.
- Publication Type:Original Article
- Keywords:
Mouse brain(cerebrum) irradiation;
Apoptosis;
Cell cycle
- MeSH:
Animals;
Apoptosis*;
Blotting, Western;
Brain*;
Cell Cycle*;
Cobalt;
Cyclin D1;
Cyclins;
Flow Cytometry;
Humans;
In Situ Nick-End Labeling;
Male;
Mice*;
S Phase
- From:The Journal of the Korean Society for Therapeutic Radiology and Oncology
2001;19(2):146-152
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
PURPOSE: To investigate the regulation of apoptosis and cell cycle in mouse brain irradiation. MATERIALS AND METHODS: 8-week old male mice, C57B1/6J were given whole body gamma-radiation with a single dose of 25 Gy using Cobalt 60 irradiator. At different times 1, 2, 4, 8 and 24hr after irradiation, mice were killed and brain tissues were collected. Apoptotic cells were scored by TUNEL assay. Expression of p53, Bcl-2, and Bax and cell cycle regulating molecules; cyclins B1, D1, E and cdk2, cdk4, p34cdc2 were analysed by Western blotting. Cell cycle was analysed by Flow cytometry. RESULTS: The peak of radiation induced apoptosis is shown at 8 hour after radiation. With a single 25 Gy irradiation, the peak of apoptotic index in C57B1/6J is 24.0+/-0.25 (p<0.05) at 8 hour after radiation. Radiation upregulated the expression of p53/tubulin, Bax/tubulin, and Bcl-2/tubulin with 1.3, 1.1 and 1.45 fold increase, respectively were shown at the peak level at 8 hour after radiation. The levels of cell cycle regulating molecules after radiation are not changed significantly except cyclin D1 with 1.3 fold increase. Fractions of Go-G1, G2-M and S phase in the cell cycle does not specific changes by time. CONCLUSIONS: In mouse brain tissue, radiation induced apoptosis is particularly shown in a specific area, subependyma. These results and lack of radiation induced changes in cell cycle offer better understanding of radiation response of normal brain tissue.
