The contents of cyclins A1, B1, E1, and D1, cyclin-dependent kinases 2 and 4 (CDK2 and CDK4), cyclin-dependent kinase 2C inhibitor (p18), and cyclin-dependent kinase 1C inhibitor (p57) in whole blood mononuclear cells of practically healthy donors and convalescents from community-acquired pneumonia were measured after cell exposure to low-intensity electromagnetic radiation of 1 GHz. The level of cyclins A1, D1, and B1, p57, and p18 proteins, and CDK2 was reduced in convalescents, while the content of cyclin B1 was elevated in both groups. A strong correlation was found between the content of cyclin B1 and the levels of cyclin A1 and CDK2 in convalescents. Single exposure of whole blood cells to 1-GHz microwaves was accompanied by an increase in the content of the analyzed factors (particularly, cyclins A1 and E1). These data indicate that radiation induced activation of the synthetic phase of the cell cycle.
Keywords: cell cycle; cyclins; microwaves; pneumonia.