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Growth regulatory pathways in myeloma. Evidence for autocrine oncostatin M expression.

J J Westendorf and D F Jelinek
J Immunol October 1, 1996, 157 (7) 3081-3088;
J J Westendorf
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D F Jelinek
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Abstract

Expression of autocrine growth factors by myeloma cells is an important mechanism that may contribute to tumor expansion. IL-6 is one of several cytokines that uses the signal transducer gp130 as a receptor component. Of these cytokines, those that have been shown to be paracrine growth factors for some myeloma cells include IL-6, IL-11, ciliary neurotrophic factor, leukemia inhibitory factor, and oncostatin M (OSM). Only IL-6, however, has been identified as an autocrine growth factor for myeloma cells. In this study we used a panel of three IL-6-responsive myeloma cell lines to investigate the expression of other autocrine growth factor loops. Initial studies employing neutralizing mAbs to IL-6 or gp130 revealed that the growth of the DP-6 and KP-6 cell lines was inhibited by both mAbs, whereas the growth of the KAS-6/1 cell line was inhibited only by the anti-gp130 mAb. Anti-OSM neutralizing mAb also inhibited KAS-6/1 cell growth. Autocrine OSM production by the KAS-6/1 cells was confirmed using a sensitive ELISA. Although the anti-OSM mAb had no significant effects on KP-6 and DP-6 cell growth, OSM was detected in DP-6 supernatants. These results suggest that OSM production and responsiveness by myeloma cells are distinct phenotypes and not necessarily related in all myeloma cells. Finally, we analyzed the significance of OSM-mediated myeloma cell growth by assessing the effects of OSM on normal, in vitro-generated plasmablasts. OSM markedly enhanced plasmablast Ig secretion but did not affect growth. Thus, the nature of the response elicited by OSM in myeloma cells is distinct from its effects on normal B lineage cells. Moreover, because gp130-mediated signaling results in myeloma cell growth, autocrine expression of any gp130-utilizing cytokine has the potential to significantly augment tumor expansion.

  • Copyright © 1996 by American Association of Immunologists

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The Journal of Immunology
Vol. 157, Issue 7
1 Oct 1996
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Growth regulatory pathways in myeloma. Evidence for autocrine oncostatin M expression.
J J Westendorf, D F Jelinek
The Journal of Immunology October 1, 1996, 157 (7) 3081-3088;

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Growth regulatory pathways in myeloma. Evidence for autocrine oncostatin M expression.
J J Westendorf, D F Jelinek
The Journal of Immunology October 1, 1996, 157 (7) 3081-3088;
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Print ISSN 0022-1767        Online ISSN 1550-6606