Acute radiation syndrome-related gene expression in irradiated peripheral blood cell populations.

PURPOSE

In a nuclear or radiological event, an early diagnostic tool is needed to distinguish the worried well from those individuals who may later develop life-threatenFing hematologic acute radiation syndrome. We examined the contribution of the peripheral blood's cell populations on radiation-induced gene expression (GE) changes.

MATERIALS AND METHODS

EDTA-whole-blood from six healthy donors was X-irradiated with 0 and 4Gy and T-lymphocytes, B-lymphocytes, NK-cells and granulocytes were separated using immunomagnetic methods. GE were examined in cell populations and whole blood.

RESULTS

The cell populations contributed to the total RNA amount with a ratio of 11.6 for T-lymphocytes, 1.2 for B-cells, 1.2 for NK-cells, 1.0 for granulocytes. To estimate the contribution of GE per cell population, the baseline (0Gy) and the radiation-induced fold-change in GE relative to unexposed was considered for each gene. The T-lymphocytes (74.8%/80.5%) contributed predominantly to the radiation-induced up-regulation observed for and the B-lymphocytes (97.1%/83.8%) for down-regulated with a similar effect on whole blood gene expression measurements reflecting a corresponding order of magnitude.

CONCLUSIONS

T- and B-lymphocytes contributed predominantly to the radiation-induced up-regulation of and down-regulation of . This study underlines the use of for biodosimetry purposes and for effect prediction of acute health effects.