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Transforming growth factor beta inhibits the proliferation of the blast cells of acute myeloblastic leukemia

N Tessier and T Hoang

Clinical Research Institute of Montreal, Quebec, Canada.

The effect of transforming growth factor beta (TGF beta) on proliferation and differentiation of peripheral blast precursors in acute myeloblastic leukemia (AML) was investigated. TGF beta induced a dose-dependent inhibition of blast clonogenic cells in suspension and methylcellulose cultures in the presence of optimal concentrations of stimulators provided by conditioned media from the bladder cell line HTB9 (HTB9-CM) or the recombinant granulocyte-macrophage colony- stimulating factor (GM-CSF). On removal of TGF beta, blast clonogenic cell proliferation recovers to the same level as that observed in control cultures, indicating that the effect is reversible. There was no induction of cell differentiation, as indicated by morphological and functional studies (production of superoxyde anions). Cell cycle analysis by thymidine uptake and flow cytometry with a DNA binding dye indicated that TGF beta caused a delay in progression into S and G2/M phases of the cell cycle without affecting cell viability. Thus, TGF beta appears to have a cytostatic rather than cytolytic effect on blast precursors and might therefore play a role as a negative regulator in hematopoiesis.

Volume 72, Issue 1, pp. 159-164, 07/01/1988
Copyright © 1988 by The American Society of Hematology


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