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Apoptosis induced by high- and low-LET radiations
J H Hendry1, C S Potten, A Merritt
1CRC Department of Experimental Radiation Oncology, Paterson Institute for Cancer Research, Christie Hospital (NHS) Trust, Manchester, UK.
Radiation and Environmental Biophysics
|March 1, 1995
Summary
Irradiation can induce apoptosis, a form of cell death, particularly after high linear energy transfer (LET) radiation. The p53 protein appears crucial for this radiation-induced apoptosis.
Area of Science:
- Radiation biology
- Cellular biology
- Molecular oncology
Background:
- Irradiation induces apoptosis in specific tissues.
- High linear energy transfer (LET) radiation also triggers apoptosis.
- The relative biological effectiveness (RBE) for neutron irradiation is significant.
Purpose of the Study:
- To investigate the role of p53 in radiation-induced apoptosis.
- To characterize the effectiveness of high-LET radiation in inducing cell death.
Main Methods:
- Analysis of apoptosis induction following irradiation.
- Comparison of apoptosis in wild-type and p53-null animal models.
- Assessment of relative biological effectiveness (RBE) for neutron irradiation.
Main Results:
- Apoptosis is a key mechanism of cell death post-irradiation in certain cell types.
- High-LET irradiation, including neutrons (14 MeV to 600 MeV), demonstrates a high RBE (3-4) for inducing apoptosis in intestinal crypts.
- Radiation-induced apoptosis is absent in p53-null animals, indicating p53's critical role.
Conclusions:
- p53 is essential for mediating radiation-induced apoptosis.
- High-LET radiation is a potent inducer of apoptosis, with significant RBE values.
- Understanding p53's role is vital for radiation therapy and radiobiology research.