Cell Growth & Differentiation, Vol 4, Issue 1 25-30, Copyright © 1993 by American Association of Cancer Research

ARTICLES

Actions and interactions of glucocorticoids and transforming growth factor beta on two related human myeloma cell lines

BH Johnson, M Gomi, SB Jakowlew, K Moriwaki and EB Thompson
Department of Human Biological Chemistry and Genetics, University of Texas Medical Branch, Galveston 77550.

To evaluate possible involvement of a paracrine/autocrine inhibitory growth factor in myeloma cell growth, we studied the expression and actions of two forms of transforming growth factor beta (TGF-beta 1 and TGF-beta 2) on two closely related myeloma cell lines, OPM-1 and OPM-2. Earlier studies showed that both cell lines contain glucocorticoid receptors, but only OPM-2 cells are growth inhibited by dexamethasone (Dex). We found that OPM-2 growth was inhibited by TGF-beta, with TGF-beta 1 exerting a greater effect than TGF-beta 2, and Dex plus TGF-beta 1 acting synergistically. In OPM-1 (Dex insensitive), TGF-beta mRNA was not expressed, whereas it was induced by Dex in OPM-2. It was also possible to block partially the growth inhibition of Dex in OPM-2 cells by the addition of anti-TGF-beta 1 antibodies. These data suggest that the glucocorticoid effect(s) on myeloma cells may be mediated at least in part through modulation of internal and/or external levels of TGF-beta 1.

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