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Mouse NIH 3T3 cells expressing the human c-fms protooncogene encoding the receptor for colony-stimulating factor 1 (CSF-1) are able to proliferate in serum-free medium containing platelet-derived growth factor (PDGF), insulin, transferrin, and albumin as the only exogenous proteins. When PDGF and insulin were replaced by purified human recombinant CSF-1, the cells became spindle shaped and refractile, were no longer contact inhibited, and proliferated to high densities. Thus, transduction of the human c-fms gene into mouse fibroblasts can not only reprogram their growth factor requirements but can also induce ligand-dependent features of cell transformation. NIH 3T3 cells stably transformed by the feline v-fms oncogene or by a mutated, oncogenic human c-fms gene were able to proliferate in the absence of exogenous growth factors. A monoclonal antibody that prevents signal transduction by the human CSF-1 receptor inhibited the growth of cells transformed by the activated c-fms oncogene, confirming that CSF-1 receptor function was required to abrogate growth factor requirements and to maintain the transformed state.

proceedings of the national academy of sciences of the united states of america

Mouse NIH 3T3 cells expressing human colony-stimulating factor 1 (CSF-1) receptors overgrow in serum-free medium containing human CSF-1 as their only growth factor.