抄録
Suramin has been shown to inhibit the binding of various growth factors to their receptors. Shionogi Carcinoma 115 cells (SC 115 cells) and Chiba Subline 2 cells (CS 2 cells) are clones of an androgen-responsive mouse tumor cell and its autonomous subline, respectively. Since the growth of SC 115 and CS 2 cells are assumed to be regulated by their own fibroblast growth factor (FGF)-like growth factors, the present study was undertaken to examine the effect of suramin on these cells.
Suramin inhibited the growth of SC 115 and CS 2 cells in a dose dependent manner. The inhibition of suramin was reversible up to 50μg/ml. Suramin reversibly changed the shape of these cells from fibroblast-like to polygonal and epithelial-like ones, and inhibited 3H-thymidine incorporation into these cells which was evoked by acidic and basic FGFs, and conditioned medium obtained from CS 2 cells. The binding of 125I-basic FGF to SC 115 and CS 2 cells was inhibited by suramin. However, suramin had no effect on growth factor production and the hst-1 gene expression on CS 2 cells. In conclusion, suramin inhibited the autocrine and paracrine growth of SC 115 and CS 2 cells by blocking the binding of autocrine growth factors to their receptors.
