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The capacity of the bone marrow-derived myelopeptide-1 (MP-1) to affect in vivo and in vitro the functional activity of phagocytes of intact mice and mice treated with a cytostatic agent (cyclophosphane) has been studied. It was found that MP-1 produces a correcting effect on the functional activity of bone marrow and peripheral blood phagocytes. An optimal scheme of the injection of MP-1 to mice with the cyclophosphane-induced immunodeficiency was developed, which provides a maximum immunocorrecting action. MP-1 had the most pronounced effect on the quantitative characteristics and the functional activity of phagocytes of different localization when introduced prior to the cytostatic; under these conditions, the pep tide affects peripheral blood neutrophils. The results obtained enable one to consider MP-1 as a preparation protecting the peripheral blood phagocytes from the damaging action of cyclophosphane.

The applicability of alkaline comet assay to studying the organ specificity of the genotoxic effects of drugs has been estimated using cells from four organs of mice (the liver, lungs, spleen, and brain). It has been found that cyclophosphamide damages DNA in all the four organs; and dioxidine, in all organs except the brain. It is concluded that this method can be used for studying the organ specificity of the DNA-damaging effects of various substances.