Proliferative activity of the hematopoietic stem cell in antigenically stimulated splenectomized mice

Proliferative activity of hemopoietic bone-marrow stem cells has been studied in splenectomized mice in response to sheep red blood cells (2 X 10(8], pneumococcal polysaccharide (100 micrograms) and lipopolysaccharide E. coli (100 micrograms) injections. Spleen and its lymphoid cellular elements were shown to be of great importance for the regulation of the functional activity of hemopoietic stem cells under the antigenic influence.