Characterization and mutual ligand-induced modulation of epidermal growth factor and interferon-α receptors on renal carcinoma cells in vitro

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Abstract
We have determined the binding of epidermal growth factor (EGF) and interferon (IFN)-alpha to their specific receptors on four renal carcinoma cell lines. CaKi-2, a-498 and ACHN cell lines express high numbers, and CaKi-1 expresses low number of EGF receptors (EGFRs). On all four renal carcinoma cell lines, we have also detected specific IFN-alpha binding sites. EGF and IFN-alpha binding to their receptors caused modulation of the other ligand's receptor binding. Scatchard analyses of binding data showed that IFN-alpha treatment leads to an increase of EGFR number in three out of four cell lines and to a decrease of EGFR number in one out of four (CaKi-1). No significant changes in EGF binding affinities were detected. EGF induced a reduction in IFN-alpha receptor number in all four cell lines without significant changes in IFN-alpha binding affinities. We hypothesize that presence of EGF in the microenvironment of renal cancer cells may modulate the biological effects of IFN and consequently decrease its antiproliferative activity.

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