Clonal variants of differentiated P19 embryonal carcinoma cells exhibit epidermal growth factor receptor kinase activity.

Differentiated clonal cell lines were isolated from pluripotent P19 embryonal carcinoma (EC) cells treated as aggregates with retinoic acid. Two were characterized in detail. The lines differ in morphology, proliferation rate, the production of plasminogen activator, and in their mitogenic response to insulin but both produce extracellular matrix proteins and can be serially passaged over extended periods, in contrast to differentiated derivatives of many other EC lines. Further, both lines have receptors for and respond mitogenically to epidermal growth factor (EGF). Endogenous phosphorylation of several proteins, including the EGF receptor (150 kDa) and a 38-kDa protein, is induced by EGF in membranes isolated from these cells. Preincubation of membranes with EGF renders them able to catalyze phosphorylation of tyrosine residues in exogenously added peptide substrates. High voltage electrophoresis confirmed the tyrosine specificity of the phosphorylation on the 150- and 38-kDa bands. By contrast, similar experiments in undifferentiated cells showed that intact P19 EC neither bind nor respond to EGF mitogenically and EGF induces no changes in phosphorylation in isolated membranes.

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