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Differential effect of interferon alpha on chronic myelogenous leukaemia and normal haematopoietic progenitors in a stromal cell co-culture context: role of the flt3 ligand

Abstract : Interferon alpha (IFN-alpha) is used to treat chronic myelogenous leukaemia (CML) patients. However, its target(s) remain(s) unknown. One possibility is that there is a differing sensitivity of the leukaemic from the normal colony-forming cell (CFC) compartments to IFN-alpha. Co-cultures of progenitors with stromal cells provide a valuable tool to dissect direct and indirect activities of IFN-alpha. In this study, we have used endothelial cells (EC) as a source of stromal cells. In co-cultures of normal progenitors with EC, IFN-alpha increased the generation of clonogenic cells, mainly via an increased production of flt3 ligand (FL) by EC. In contrast, in co-cultures of CML progenitors with EC, IFN-alpha inhibited the generation of clonogenic cells, mainly by direct inhibition on the progenitors, the up-regulation of FL production by stromal cells being unable to compensate for the direct inhibitory effects of IFN-alpha. These data provide evidence for a differential effect of IFN-alpha on the growth of CML and normal CFC cells in a stromal context and suggest that an alteration in the response of CML progenitor cells to FL is important in the explanation of this differential effect.
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https://www.hal.inserm.fr/inserm-02519479
Contributor : Christophe Grosset <>
Submitted on : Thursday, March 26, 2020 - 9:46:48 AM
Last modification on : Friday, November 6, 2020 - 3:53:31 AM

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A. Solanilla, A. El Andaloussi, C. Grosset, P. Duchez, M. Mossalayi, et al.. Differential effect of interferon alpha on chronic myelogenous leukaemia and normal haematopoietic progenitors in a stromal cell co-culture context: role of the flt3 ligand. British Journal of Haematology, Wiley, 2000, 109 (2), pp.382-387. ⟨10.1046/j.1365-2141.2000.01917.x⟩. ⟨inserm-02519479⟩

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