Abstract
A murine retroviral vector, LSNLsrc, has been constructed and examined for its ability to induce growth factor independence in cells normally dependent on interleukin 2 (IL-2) or interleukin 3 (IL-3) for growth. The LSNLsrc vector coexpressed the v-src gene of Rous sarcoma virus and the neo gene from transposon Tn5, allowing infected cells to be selected on the basis of G418 resistance. The murine cell lines CTLL-2 and FD.C/1, which are dependent for growth on IL-2 and IL-3, respectively, were both readily infected with the LSNLsrc virus. LSNLsrc-infected, G418-resistant cultures of FD.C/1 cells were able to give rise to IL-3-independent progeny, but all G418-resistant CTLL-2 cells retained normal IL-2 dependence. The induction of IL-3 independence by v-src was not a direct event, since limiting dilution analysis of the LSNLsrc-infected FD.C/1 cells showed that most of them were IL-3 dependent, despite expression of v-src mRNA and active pp60v-src kinase. However, clones selected from this population in the presence of IL-3 were able to undergo a subsequent progression event and generate IL-3-independent progeny. The generation of factor-independent variants in the clonal cultures was a rare event, as witnessed by the death of most of the cells in each clone when IL-3 was withdrawn. Together, these data indicate that a secondary event, in addition to v-src expression, was required to generate IL-3-independent growth. No evidence was found for an autocrine mechanism of transformation involving IL-2, IL-3, interleukin 4, or granulocyte-macrophage colony-stimulating factor.
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