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Regular physical activity of moderate intensity over a long period (swimming at water temperature of 33-35°C without load, 2 h per day, 5 days a week for 4 months) activated hemopoiesis in mice: stimulation of myelopoiesis in the bone marrow and increase in the percentage of erythropoietic elements in the spleen were observed. In the peripheral blood, the relative content of lymphocytes increased, that of granulocytes decreased, and plasma cells appeared. Stimulation of erythropoiesis in the spleen can be partially responsible for suppression of immune responses during physical exercise.

Semiallogenic transfer of lymphoid cells from parental DBA/2 strain to (C57Bl/6xDBA/2)F1 hybrids induces two variants of chronic graft-versus-host reaction with predominant activation of donor Th1 or Th2 cells [2] in genetically homologous recipients: first, severe inhibition of the humoral immune response, or second, autoimmune disease (lupus nephritis) against the background of suppressed cell and humoral immunity. These variants of chronic graft-versus-host reaction are characterized by different changes in interleukin-1 level.