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The Journal of Immunology, Vol 143, Issue 5 1591-1597, Copyright © 1989 by American Association of Immunologists
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DH Broide, SI Wasserman, J Alvaro-Gracia, NJ Zvaifler and GS Firestein
Department of Medicine, University of California, San Diego 92103.
Transforming growth factor-beta 1 (TGF-beta 1) is an important regulator of cell growth, differentiation, and function. We show that TGF-beta 1 selectively inhibits IL-3-dependent mouse bone marrow derived mast cell (MBMMC) proliferation without affecting MBMMC function or differentiation. TGF-beta 1 significantly decreased [3H]thymidine uptake by IL-3-dependent MBMMC in a dose-dependent manner with 50% inhibition of proliferation occurring with a TGF-beta 1 concentration of 0.1 ng/ml. A brief (i.e., 30 min) incubation of MBMMC with TGF-beta 1 is sufficient to inhibit IL-3-induced proliferation of MBMMC (cultured in the absence of TGF-beta 1) for 24 to 48 h. The inhibitory effect of TGF-beta 1 on the IL-3-dependent proliferation of MBMMC is not cytotoxic as evident from the absence of MBMMC trypan blue staining, the retained functional characteristics of the MBMMC cultured in TGF-beta 1, and the reversibility of the TGF-beta 1 induced inhibition of IL-3 dependent MBMMC proliferation. MBMMC grown in TGF- beta 1 acutely (24 to 48 h) or chronically (7 to 14 days) do not exhibit functional differences in performed or newly generated mediator secretion (Ag/IgE or calcium ionophore A23187 induced MBMMC beta- hexosaminidase or leukotriene C4 release) from MBMMC grown in the absence of TGF-beta 1. In addition, MBMMC cultured for 2 wk in TGF-beta 1 do not show evidence of differentiation as assessed by cellular histamine content or Alcian blue/safranin staining. Thus, TGF-beta 1 is an important negative regulator of IL-3-dependent mast cell proliferation in vitro, selectively inhibiting IL-3-dependent MBMMC proliferation without affecting MBMMC function or differentiation.
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