Abstract
A factor inhibiting the proliferation of splenic colony-forming units, injected bothin vivo and after preincubation of mouse bone marrow cellsin vitro, had a dose-dependent effect on the increased proliferative activity of splenic colony-forming units from the bone marrow of mice treated with testosterone propionate. This was associated with a reduction in the number of early hemopoietic precursors of mouse bone marrow. The counts of clonogenic granulocytic-macrophagal and macrophagal colony-forming units decreased and that of burst-forming units in murine bone marrow increased after exposure to the hormone. Testosterone propionate promoted a decrease of the repopulating potential of bone marrow cells, which recovered after their preincubation with the factor inhibiting the proliferation of splenic colony-forming units.
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