Abstract
Purpose: To investigate the potential of interferon β to enhance the cytotoxic activity of ionizing irradiation against glioma cells, and to elucidate the possible mechanisms responsible for conflicting clinical results. Methods and Materials: Five glioblastoma cell lines (U87MG, U118MG, U373MG, MO59K, MO59J) with different radiosensitivity and genetic background were used. Experiments were performed in exponentially growing cultures, and cell survival was measured by a colony-forming assay. Cells were incubated with natural interferon β (n-IFN-β; 30-3000 IU/mL) for 24 h followed by single dose irradiation with 1 to 6 Gy of γ-rays. Results: Significant differences in n-IFN-β sensitivity were found. The cell lines also differed in their radiation sensitivity, and there was no correlation between the n-IFN-β and the radiation sensitivity. In three of five cell lines, the interaction of n-IFN-β and irradiation was infra-additive; in one cell line, it was additive. For MO59J cells only, which are NHEJ-deficient, supra-additivity was observed. Conclusion: Our results confirm the remarkable heterogeneity that is characteristic of malignant glioma. The combined effect of n-IFN-β and radiation was mostly infra-additive or additive; synergistic interaction might occur in tumor cells that already have acquired repair deficiencies because of their genetic instability, as shown for the MO59J cell line.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1348-1357 |
| Number of pages | 10 |
| Journal | International Journal of Radiation Oncology Biology Physics |
| Volume | 55 |
| Issue number | 5 |
| DOIs | |
| State | Published - Apr 1 2003 |
| Externally published | Yes |
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Keywords
- Glioblastoma
- In vitro
- Interferon beta
- Radiosensitization
ASJC Scopus subject areas
- Oncology
- Radiology Nuclear Medicine and imaging
- Radiation
Cite this
Lack of interferon beta-induced radiosensitization in four out of five human glioblastoma cell lines. / Schmidberger, Heinz; Rave-Fränk, Margret; Lehmann, Jörg; Weiss, Elisabeth; Gerl, Lara; Dettmer, Nadine; Glomme, Sabine; Hess, C. F.
In: International Journal of Radiation Oncology Biology Physics, Vol. 55, No. 5, 01.04.2003, p. 1348-1357.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Lack of interferon beta-induced radiosensitization in four out of five human glioblastoma cell lines
AU - Schmidberger, Heinz
AU - Rave-Fränk, Margret
AU - Lehmann, Jörg
AU - Weiss, Elisabeth
AU - Gerl, Lara
AU - Dettmer, Nadine
AU - Glomme, Sabine
AU - Hess, C. F.
PY - 2003/4/1
Y1 - 2003/4/1
N2 - Purpose: To investigate the potential of interferon β to enhance the cytotoxic activity of ionizing irradiation against glioma cells, and to elucidate the possible mechanisms responsible for conflicting clinical results. Methods and Materials: Five glioblastoma cell lines (U87MG, U118MG, U373MG, MO59K, MO59J) with different radiosensitivity and genetic background were used. Experiments were performed in exponentially growing cultures, and cell survival was measured by a colony-forming assay. Cells were incubated with natural interferon β (n-IFN-β; 30-3000 IU/mL) for 24 h followed by single dose irradiation with 1 to 6 Gy of γ-rays. Results: Significant differences in n-IFN-β sensitivity were found. The cell lines also differed in their radiation sensitivity, and there was no correlation between the n-IFN-β and the radiation sensitivity. In three of five cell lines, the interaction of n-IFN-β and irradiation was infra-additive; in one cell line, it was additive. For MO59J cells only, which are NHEJ-deficient, supra-additivity was observed. Conclusion: Our results confirm the remarkable heterogeneity that is characteristic of malignant glioma. The combined effect of n-IFN-β and radiation was mostly infra-additive or additive; synergistic interaction might occur in tumor cells that already have acquired repair deficiencies because of their genetic instability, as shown for the MO59J cell line.
AB - Purpose: To investigate the potential of interferon β to enhance the cytotoxic activity of ionizing irradiation against glioma cells, and to elucidate the possible mechanisms responsible for conflicting clinical results. Methods and Materials: Five glioblastoma cell lines (U87MG, U118MG, U373MG, MO59K, MO59J) with different radiosensitivity and genetic background were used. Experiments were performed in exponentially growing cultures, and cell survival was measured by a colony-forming assay. Cells were incubated with natural interferon β (n-IFN-β; 30-3000 IU/mL) for 24 h followed by single dose irradiation with 1 to 6 Gy of γ-rays. Results: Significant differences in n-IFN-β sensitivity were found. The cell lines also differed in their radiation sensitivity, and there was no correlation between the n-IFN-β and the radiation sensitivity. In three of five cell lines, the interaction of n-IFN-β and irradiation was infra-additive; in one cell line, it was additive. For MO59J cells only, which are NHEJ-deficient, supra-additivity was observed. Conclusion: Our results confirm the remarkable heterogeneity that is characteristic of malignant glioma. The combined effect of n-IFN-β and radiation was mostly infra-additive or additive; synergistic interaction might occur in tumor cells that already have acquired repair deficiencies because of their genetic instability, as shown for the MO59J cell line.
KW - Glioblastoma
KW - In vitro
KW - Interferon beta
KW - Radiosensitization
UR - http://www.scopus.com/inward/record.url?scp=0345269070&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0345269070&partnerID=8YFLogxK
U2 - 10.1016/S0360-3016(02)04575-3
DO - 10.1016/S0360-3016(02)04575-3
M3 - Article
C2 - 12654447
AN - SCOPUS:0345269070
VL - 55
SP - 1348
EP - 1357
JO - International Journal of Radiation Oncology Biology Physics
JF - International Journal of Radiation Oncology Biology Physics
SN - 0360-3016
IS - 5
ER -