Cell Growth & Differentiation, Vol 7, Issue 11 1535-1544, Copyright © 1996 by American Association of Cancer Research

ARTICLES

Transforming growth factor beta 1 functions in monocytic differentiation of hematopoietic cells through autocrine and paracrine mechanisms

JM Turley, LA Falk, FW Ruscetti, JJ Kasper, T Francomano, T Fu, OS Bang and MC Birchenall-Roberts
Laboratory of Leukocyte Biology, National Cancer Institute, Frederick, Maryland 21702, USA.

This study examined the role of transforming growth factor beta 1 (TGF-beta 1) in monocytic differentiation of hematopoietic cells. TGF-beta 1 and retinoic acid (RA) inhibited HL-60 cell growth in a dose-dependent fashion. Treatment of HL-60 cells with a combination of TGF-beta 1 and a 50% optimal dose of RA (RA + TGF-beta 1) resulted in increased growth suppression compared to the individual treatments. Morphological studies revealed that TGF-beta 1 induced promonocytic differentiation (68%), RA induced granulocytic differentiation (98%), and RA + TGF-beta 1 induced monocytic (54%) and granulocytic (46%) differentiation of HL-60 cells. Induction of the monocyte-specific marker, nonspecific esterase, was markedly increased by TGF-beta 1 and RA + TGF-beta 1 treatment but not by RA treatment. Both TGF-beta 1 treatment and RA treatment increased TGF-beta ligand and TGF-beta receptor protein and mRNA levels. To determine whether RA mediated HL-60 cell growth inhibition and differentiation through the autocrine expression of TGF-beta 1, experiments using TGF-beta 1 antisense oligonucleotides or TGF-beta 1-neutralizing antibodies were conducted. TGF-beta 1 antisense oligonucleotides and neutralizing antibodies partially blocked RA-induced inhibition of proliferation, and TGF-beta 1 antisense oligonucleotides reversed RA-induced granulocytic maturation, demonstrating that RA signals autocrine expression of TGF-beta 1 and TGF-beta receptors. The effect of TGF-beta 1 on normal hematopoiesis was also studied using primary human fetal liver cells. TGF-beta 1 alone and in the presence of interleukin 3 promoted macrophage differentiation of primitive fetal liver cells. Cell surface expression of the monocyte/macrophage-specific marker c-fms was increased 3.1-fold following TGF-beta 1 treatment. In addition, TGF-beta 1-treated cells displayed a 51% increase in phagocytosis as compared to interleukin 3-treated control cells. These studies define a role for TGF-beta 1 in the autocrine and paracrine regulation of monocyte/macrophage differentiation.

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