Cell density-dependent proliferative effects of transforming growth factor (TGF)-β1, β2, and β3 in human chondrosarcoma cells HCS-2/8 are associated with changes in the expression of TGF-β receptor type I

In this study, the growth properties of the human chondrosarcoma cell line HCS-2/8, its response to transforming growth factor (TGF)-beta isoforms 1, 2, and 3, and its expression of TGF-beta receptors I and II were examined. We demonstrated that these tumor cells are not contact-inhibited and that they can proliferate in the absence of additional serum growth factors. In sparse cultures, all TGF-beta forms inhibited the growth of HCS-2/8 cells, whereas they induced a 2-fold increase of DNA synthesis in serum-fed confluent cultures. In serum-free confluent conditions only TGF-beta1 stimulated the proliferation rate, whereas TGF-beta2 was without effect and TGF-beta3 was rather inhibitory. The bimodal effect of TGF-beta forms was associated with a greater level of TGF-beta receptor I mRNA in confluent HCS-2/8 than in sparse cultures suggesting that the growth response to TGF-beta forms is dependent on the receptor profile expressed.