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Influence of Interferon Preparations on the Proliferative Capacity of Human and Mouse Bone Marrow Cells in Vitro

Departments of Experimental Pathology [E. van 't H., M. J. de V.], Virology [H. S.], and Hematology [B. L.], Erasmus University Rotterdam, P. O. Box 1738, Rotterdam, The Netherlands

The toxicity of interferon to bone marrow was studied by the use of in vitro colony forming assays for hemopoietic cells. In the same study the relative inhibitory effects of two clinically common interferon preparations, leukocyte and fibroblast interferons, were compared with regard to their effect on both myeloid [colony-forming unit, culture (CFU_e)] and erythroid [colony-forming unit, erythroid (CFU_e)] progenitor cells. CFU_e formation in human bone marrow cells in vitro appeared to be fairly resistant to both interferons. Only high doses of both interferons gave a marked inhibition of CFU_e.

However, the toxicity of leukocyte and fibroblast interferon was divergent for CFU_c in human bone marrow. Leukocyte Interferon appeared to be considerably more inhibitory for CFU_c than was fibroblast interferon.

The effects of mouse interferon, induced in L929 cells, on the growth of CFU_c and CFU_e in murine bone marrow cells were comparable with those of fibroblast interferon on human cells.

The toxicity of human and murine interferon was species specific. Except for the toxicity of leukocyte interferon to CFU_c in human bone marrow, the toxicity of interferon was marked only with concentrations of inter feron far exceeding the amount necessary to produce an antiviral state in vitro.

Received 8/26/77. Accepted 1/11/78.

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