The influence of human interleukin-1 beta in different concentration on processes of postirradiation recovery of haemopoietic precursors (GM-CFC) and morphology of recognized elements of bone marrow were studied in long-term bone marrow cultures during 28 days after gamma-irradiation with a dose of 2 Gy. It was studied also the action of interleukin-1 beta on proliferation, the contents of GM-CFC and the induction of GM-CSF in non-irradiated cultures. It was shown that the injection of interleukin-1 beta increased proliferation and the content of GM-CFC and also raised an induction of GM-CSF in the non-irradiation cultures. The maximum increase of a level of GM-CSF, amount of GM-CFC and proliferation of GM-CFC was marked in 20 hours after the injection of cytokine. Under irradiation of long-term bone marrow cultures the maximum stimulation effect to recovery of GM-CFC, total number of myelocaryocytes and the content of immature and mature granulocytes were observed after the injection of interleukin-1 beta in concentration of 0.005 microgram/ml 20 hours prior to radiation exposure. The data of this report suggest that one of the mechanisms of radioprotective action of interleukin-1 beta apparently is connected with stimulation action on hematopoietic microenvironment cellular elements that causes the release of GM-CSF or/and other cytokines, and stimulation recovery of haemopoietic precursors.
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