Toxicological Sciences 53, 369-376 (2000)
Copyright © 2000 by the Society of Toxicology
Induction of Cell-Proliferation Hormesis and Cell-Survival Adaptive Response in Mouse Hematopoietic Cells by Whole-Body Low-Dose Radiation
,
,1
* Institute of Hematopoietic Disorders,
Department of Toxicology, School of Preventive Medicine, Norman Bethune University of Medical Sciences, Changchun 130021, People's Republic of China; and
Department of Pathology, University of Western Ontario, London, Ontario N6A 5C1, Canada
Hormesis and a cytogenetic adaptive response induced by low-dose radiation (LDR) have been extensively documented. However, few studies have investigated the induction of an adaptive response by LDR for cell survival in vitro. In the present study, we investigated whether LDR could induce hormesis in hematopoietic cells and the adaptive response of these cells to subsequent high-dose radiation-induced cytotoxic effects. Mice were exposed in whole-body to 0 (as control), 0.05, 0.25, 0.50, 0.75, and 1.00 Gy of X-rays. They were killed 12, 24, 48, and 72 h later to observe the stimulating effect of LDR on total bone marrow cells per femur and bone marrow progenitor, colony-forming unit-granulocyte-macrophage (CFU-GM). Exposure to 0.5 Gy of X-rays resulted in significantly stimulating effects on both parameters with a maximum effect at 48 h, showing a cell-proliferation hormesis. In the next experiment, mice were irradiated by 0.5 Gy X-rays as an adaptive exposure (D1), and 6, 12, 24, 48, and 72 h later, they were exposed to 6 Gy X-rays as a challenging exposure (D2). Forty-eight h after D2, cytotoxic effects were analyzed using peripheral blood cells (red blood cells, white blood cells, and platelets) and bone marrow cells (total bone marrow cells of the femur, and bone marrow progenitors such as CFU-GM and erythroid burst-forming unit, BFU-E). An adaptive response to D2-induced cytotoxic effect, named as the cell-survival adaptive response, was found in both peripheral blood cells and bone marrow cells when D1 and D2 exposures were given at intervals of 24–48 h. These results suggested that LDR could induce both cell-proliferation hormesis and cell-survival adaptive response to subsequent high-dose radiation in bone marrow cells. It may be of potential importance, if this phenomenon is confirmed clinically, since it may be applied to reduce the adverse effect of radiotherapy.
Key Words: low-dose radiation; hematopoietic cells; hormesis; adaptive response; cell-survival response.
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