The content of CD117(+)cells in the kidneys and CD45(low)CD117(+)cells in the bone marrow and blood of mice were studied after partial nephrectomy and under conditions of macrophage stimulation with 3-aminophthalhydrazide. The counts of tubular CD117(+)epitheliocytes sharply increased and the content of CD45(low)CD117(+)cells in the bone marrow decreased after renal damage. Injection of 3-aminophthalhydrazide stimulated the expression of CD117 by renal epitheliocytes and led to reduction of CD45(low)CD117(+)cell counts in the bone marrow and blood. Macrophages stimulated proliferative processes in the kidney and differentiation of stem cells in the bone marrow due to synergic effects of their cytokines and stem cell factor.