Growth-promoting effects of insulin-like growth factor-1 (IGF-1) on hematopoietic cells: overexpression of introduced IGF-1 receptor abrogates interleukin-3 dependency of murine factor-dependent cells by a ligand-dependent mechanism

Although insulin-like growth factor (IGF-1) stimulated 3H-thymidine incorporation upon addition to the interleukin-3 (IL-3)-dependent cell line FDC-P1, IGF-1 did not relieve IL-3 dependency for growth. To further examine the effects of IGF-1 on hematopoietic cells, FDC-P1 cells were infected with a retroviral construct (LISN) containing the human IGF-1 receptor (hIGF-1R) and neo genes. IL-3-independent cells were readily isolated after LISN infection when either IGF-1 or supraphysiologic concentrations of insulin were included in the culture medium. These cells were transformed to IL-3 independence by a ligand- dependent mechanism because their growth was dependent on the presence of either IGF-1 or insulin and growth factors capable of supporting autocrine growth were not detected. Furthermore, a monoclonal antibody (MoAb) directed against the human IGF-1R (alpha IR-3) inhibited IGF-1 but not IL-3-induced proliferation and these cells contained 20- to 200- fold more IGF-1 receptors than uninfected FDC-P1 cells. In contrast, when LISN-infected cells were plated in medium without exogenously supplied IGF-1 or insulin, factor-independent cells were rarely isolated. Growth of these cells was also inhibited by the alpha IR-3 MoAb and they expressed 100- to 400-fold more IGF-1 receptors than uninfected FDC-P1 cells. The endogenous IGF-1 and/or insulin present in the calf serum may have enabled their growth because these cells, unlike the parental cells, would proliferate in serum-free defined media and their growth was again inhibited by the alpha IR-3 MoAb. These results demonstrate that IGF-1 can replace IL-3 for growth when FDC-P1 cells overexpress the IGF-1R. Given the fairly ubiquitous expression of the IGF-1 receptor, these and additional experiments might help to determine whether increased expression of endogenous receptors by cells can lead to leukemogenesis and tumorigenesis. Moreover, hIGF-1R-infected cells will be useful in investigating the mechanisms of IGF1-mediated signal transduction because they are now known to proliferate in response to IGF-1.

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