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Transforming Growth Factor- 1 Abrogates Fas-Induced Growth Suppression and Apoptosis of Murine Bone Marrow Progenitor Cells
Ingunn Dybedal,
Fengan Guan,
Ole Johan Borge,
Ole Petter Veiby,
Veslemøy Ramsfjell,
Shigekazu Nagata, and
Sten Eirik W. Jacobsen
From the Hipple Cancer Research Center, Dayton, OH; Stem Cell Laboratory, Section for Molecular Medicine and Gene Therapy, the Department of Internal Medicine, University Hospital of Lund, Lund, Sweden; and Osaka Bioscience Institute, Osaka, Japan.
Fas, a member of the tumor necrosis factor (TNF ) receptor superfamily is a critical downregulator of cellular immune responses. Proinflammatory cytokines like interferon- (IFN- ) and TNF- can induce Fas expression and render hematopoietic progenitor cells susceptible to Fas-induced growth suppression and apoptosis. Transforming growth factor- 1 (TGF- 1 ) is an essential anti-inflammatory cytokine, thought to play a key role in regulating hematopoiesis. In the present studies we investigated whether TGF- 1 might regulate growth suppression and apoptosis of murine hematopoietic progenitor cells signaled through Fas. In the presence of TNF, activation of Fas almost completely blocked clonogenic growth of lineage-depleted (Lin-) bone marrow (BM) progenitor cells in response to granulocyte-macrophage colony-stimulating factor (GM-CSF ), CSF-1, or a combination of multiple cytokines. Whereas TGF- 1 alone had no effect or stimulated growth in response to these cytokines, it abrogated Fas-induced growth suppression. Single-cell studies and delayed addition of TGF- 1 showed that the ability of TGF- 1 to inhibit Fas-induced growth suppression was directly mediated on the progenitor cells and not indirect through potentially contaminating accessory cells. Furthermore, TGF- 1 blocked Fas-induced apoptosis of Lin- BM cells, but did not affect Fas-induced apoptosis of thymocytes. TGF- 1 also downregulated the expression of Fas on Lin- BM cells. Thus, TGF- 1 potently and directly inhibits activation-dependent and Fas-mediated growth suppression and apoptosis of murine BM progenitor cells, an effect that appears to be distinct from its ability to induce progenitor cell-cycle arrest. Consequently, TGF- 1 might act to protect hematopoietic progenitor cells from enhanced Fas expression and function associated with proinflammatory responses.
Blood, Vol. 90 No. 9 (November 1), 1997:
pp. 3395-3403
© 1997 by The American Society of Hematology.

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