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IL-3 induces apoptosis in a ras-transformed myeloid cell line

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Abstract

Growth factors promote cell survival and proliferation. Homeostasis is maintained by programmed cell death which occurs when the growth stimulus is withdrawn, in response to negative growth regulators such as interferons, TNF-α and CD95 ligand, or following differentiation. Although acutely-transforming oncogenes often overcome the need for growth factors, growth regulatory cytokines can influence proliferative responses of transformed cells. In this study we investigated the effects of IL-3 on the proliferative responses of parental bone marrow-derived 32D cells and cells transformed with ras and abl oncogenes. We show that treatment of ras-transformed 32D cells with IL-3 reduced proliferative responses and decreased colony-forming ability. These effects were exacerbated in the absence of serum and associated with inhibition of tyrosine kinase activity, down-regulation of RAS and MYC expression, and induction of apoptosis as indicated by DNA fragmentation. In contrast, treatment of parental 32D cells with IL-3, which is obligatory for cell survival and proliferation, increased tyrosine kinase activity, upregulated MYC and RAS expression and maintained DNA integrity. With abl-transformed cells, proliferation and colony-forming ability were also inhibited by IL-3. Tyrosine kinase activity and MYC expression were reduced, but early apoptosis was not evident. Calcium uptake however, was stimulated by IL-3 in both parental and oncogene-transformed cells. These results suggest that threshold levels of tyrosine kinase activity are necessary for cell survival and proliferation and that with ras-transformed cells, IL-3 treatment may result in this threshold being breached. We conclude that in some situations, growth-promoting cytokines can inhibit proliferation of transformed cells and induce cell death by apoptosis.

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  1. N. Ahmed

    Present address: Surgical Science, Royal Newcastle Hospital, NSW, 2300, Australia

Authors and Affiliations

  1. Malaghan Institute of Medical Research, PO Box 7060, Wellington South, New Zealand;

    N. Ahmed & M. V. Berridge

  2. Department of Pathology, University of Colorado Health Sciences Center, 4200 East Ninth Avenue, Denver, CO, 800262

    S. M. Anderson

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Ahmed, N., Anderson, S.M. & Berridge, M.V. IL-3 induces apoptosis in a ras-transformed myeloid cell line. Apoptosis 4, 71–80 (1999). https://doi.org/10.1023/A:1009686220607

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