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[Cytogenetic adaptive response induced by low dose radiation]
Yi Chuan Xue Bao = Acta Genetica Sinica
|January 1, 1991
Summary
A low dose of x-rays can protect cells from future radiation damage, an adaptive response lasting up to three cell cycles. This protective effect can be re-established with repeated low-dose exposures, demonstrating radio-protection.
Area of Science:
- Radiobiology
- Cell Biology
- Genetics
Background:
- Low-dose radiation exposure can induce protective mechanisms in cells.
- Understanding cellular responses to radiation is crucial for radiation protection and therapy.
Purpose of the Study:
- To investigate the adaptive response of cells to low-dose x-ray pre-exposure.
- To determine the duration and re-inducibility of this adaptive response.
- To explore the in vivo induction of adaptive response in mammalian cells.
Main Methods:
- In vitro irradiation of human and rabbit lymphocytes with varying x-ray doses and cell cycle phase analysis.
- In vivo irradiation of mouse bone marrow and germ cells.
- Assessment of chromosome aberration frequency as a measure of cellular damage.
Main Results:
- Pre-exposure to 0.01 Gy x-rays significantly reduced chromosome aberrations from a subsequent 1.5 Gy dose (P < 0.01).
- The adaptive response persisted for approximately three cell cycles.
- The adaptive response could be revived upon re-exposure to low-dose radiation after the third cell cycle.
- Adaptive response was also observed in vivo in mouse bone marrow and germ cells.
Conclusions:
- A transient adaptive response to radiation-induced chromosome damage is induced by low-dose x-ray pre-exposure.
- This radio-protective effect is dose-rate dependent and can be re-established.
- The findings have implications for understanding cellular radio-resistance and potential applications in radiation protection.