C127 cells resistant to transformation by tyrosine protein kinase oncogenes.

C127 is a nontumorigenic mouse cell line widely used in in vitro transformation assays due to its normal morphological appearance and its very low levels of spontaneous transformation. We now report that C127 cells are resistant to transformation by tyrosine protein kinase oncogenes derived from growth factor receptors such as the retroviral v-fms and the human trk transforming genes. In contrast, these cells could be efficiently transformed by members of the ras oncogene family and by serine/threonine kinase oncogenes such as v-mos and v-raf. C127 cells were also found to be resistant to transformation by v-src, the prototype of a large family of tyrosine protein kinase oncogenes whose products are associated with the inner side of the plasma membrane. However, morphologically normal C127 cells expressing pp60v-src acquired a transformed phenotype upon continuous passage in vitro. Somatic cell hybrids (neoR, hygroR) obtained by fusion of G418-resistant C127 cells expressing p70trk (neoR) and hygromycin-resistant NIH3T3 cells (hygroR) exhibited transformed properties as determined by their ability to grow in semisolid agar. In contrast, no such growth was observed when these neoR p70trk-containing C127 cells were fused to control hygroR C127 cells. These results indicate that C127 cells may either lack or express insufficient levels of certain critical substrate(s) necessary for the onset of transformation by tyrosine protein kinase oncogenes.

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