Chemotactic factor-induced adherence of tumor cells.

Two peptides which have previously been shown to induce chemotactic motility in a number of tumor cells were tested for their ability to alter the adhesiveness of Walker Carcinosarcoma cells (A chemotactically-responsive rat tumor) and normal rat fibroblasts (which have previously been shown to be chemotactically nonresponsive). Adherence of the tumor cells to nylon fibers was increased in a dose-dependent manner by the two active peptides. Adherence of the fibroblasts was not increased. Nonchemotactic peptide analogues of the two active peptides did not alter the adherence of either cell type. The increased adhesiveness to foreign surfaces may contribute to the chemotactic response.