Production of Basic Fibroblast Growth Factor‐like Factor by Cultured Human Cholangiocellular Carcinoma Cells

An extract of cultured human cholangiocellular carcinoma cells (HuCC‐T1) was found to contain high mitogenic activity for BALB/c3T3 cells. The growth factor eliciting most of the mitogenic activity was purified and concluded to be identical with basic fibroblast growth factor (bFGF)‐like factor on the basis of its molecular weight and heparin‐Sepharose elution profile, and the results of immunoblotting and radioimmunoassay. HuCC‐T1 cells also secreted bFGF‐like factor into serum‐free medium. A combination of insulin and transferrin or bovine serum albumin stimulated the growth of HuCC‐T1 cells in serum‐free medium. However, bFGF did not stimulate their growth in the presence and absence of these supplements. Neutralizing monoclonal antibody against bFGF did not inhibit growth. These results indicate that bFGF‐like factor is not a growth factor for this cell line.