Abstract

Hematopoietic stem cell inhibition factor (SCIF), liberated by lymphocytes treated with antilymphocytic globulin, causes inhibition of migration of the spleen cells of intact mice. The degree of inhibition of migration corresponds to the colony-inhibiting activity of the SCIF. Macrophage migration inhibition factor (MMIF) obtained in the H-2 system has a stimulating effect on exocolonization in mice on treatment of a bone-marrow graft in vitro. The colony-stimulating activity of MMIF corresponds to its inhibitory effect on migration of spleen cells. Incubation of bone marrow cells with MMIF for 30 min is more effective than incubation for 2 h. It is suggested that SCIF and MMIF are not identical with one another.

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