Interleukin-6 and transforming growth factor-beta synergistically stimulate chondrosarcoma cell proliferation.

Abstract:

:This study examines the regulation of Swarm rat chondrosarcoma (SRC) cell proliferation in vitro. In serum-free cultures, SRC cells showed only transient DNA synthesis and this was increased by serum. Transforming growth factor-beta (TGF-beta) was identified as an essential serum component, since the mitogenic effect of sera was related to their TGF-beta content and neutralized by antibody to TGF-beta. Among a large panel of agents tested, TGF-beta was the only factor that stimulated proliferation in serum-free media. The TGF-beta isoforms TGF-beta 1 and TGF-beta 2 induced similar dose-dependent increases with maximal 62.5-fold stimulation at 10 ng/ml. Interleukin-6 (IL-6) was identified as a new factor that stimulated SRC proliferation. IL-6 effects were serum-dependent and their magnitude correlated with the TGF-beta content in different serum preparations. In serum-free cultures where IL-6 by itself had no detectable effect it caused up to 7.6-fold increased proliferation in the presence of small doses of TGF-beta (0.01-0.1 ng/ml). This synergy was unique, since no other factor tested synergized with IL-6 or TGF-beta. In examining potential mechanisms for this synergy it was found that TGF-beta increased IL-6 receptor expression. In summary, these results identify IL-6 as a new and TGF-beta as the most potent growth factor for chondrosarcoma cells and describe novel interactions between these factors in the regulation of cell growth.

journal_name

J Cell Physiol

authors

Guerne PA,Lotz M

doi

10.1002/jcp.1041490115

subject

Has Abstract

pub_date

1991-10-01 00:00:00

pages

117-24

issue

1

eissn

0021-9541

issn

1097-4652

journal_volume

149

pub_type

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