Abstract
STAT3 is a key downstream signaling intermediate of gp130, a receptor previously shown to activate hematopoietic stem cell (HSC) self-renewal divisions. These findings prompted us to investigate if the STAT3 pathway is important to HSC activity in vivo. Initial semi-quantitative RT–PCR analyses showed STAT3 to be expressed at slightly higher levels in primitive subsets of both human and murine adult bone marrow cells. To test the effect of abrogating STAT3 activity in HSCs, primitive murine fetal liver cells were transduced at high efficiency with either a bicistronic dominant-negative (dn) or wild-type (wt) STAT3-IRES-GFP retrovirus. Dn STAT3-transduced HSCs showed markedly and permanently reduced in vivo lympho-myeloid reconstituting ability relative to co-transplanted non-transduced HSCs or HSCs transduced with a control (GFP-only) vector. In contrast, the activity of dn STAT3-transduced cells with short term in vivo (CFU-S) or in vitro (CFC) proliferation potential was not affected. Overexpression of wt-STAT3 had very little effect on either HSCs or shorter term progenitors. These findings suggest HSCs express non-limiting levels of STAT3 which, nevertheless, play an important stage-specific and non-redundant role in maintaining the function of HSCs stimulated to divide in adult marrow tissue.
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Acknowledgements
The authors thank Cindy Cao, Geoff Gotto, Maya Sinclair, Margaret Hale, and the staff of the Terry Fox Laboratory FACS service for expert technical assistance, Dr A Mui for the STAT3 plasmids, Dr K Humphries for the MSCV–IRES–GFP plasmid and Amy Ahamed for typing. This study was supported by the National Cancer Institute of Canada (NCIC) with funds from the Canadian Cancer Society and the Terry Fox Run. I-H Oh held a NCIC Postdoctoral Fellowship and C Eaves was a Terry Fox Cancer Research Scientist of the NCIC.
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Appendix
Appendix
Inhibition of endogenous STAT3 activation by dn STAT3 in stably transduced M1 cells. Aliquots of cells stably-transduced with each retroviral vector were stimulated with IL-6 (100 ng/ml) for 15 min and then analysed by Western blotting for the presence of phosphorylated STAT3 using an anti-phosphotyrosine (Tyr705)-specific anti-STAT3 antibody (105 cells per lane). The membrane was then stripped and re-probed for total STAT3 protein using a polyclonal antibody against STAT3 (see Figure 10).
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Oh, IH., Eaves, C. Overexpression of a dominant negative form of STAT3 selectively impairs hematopoietic stem cell activity. Oncogene 21, 4778–4787 (2002). https://doi.org/10.1038/sj.onc.1205592
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DOI: https://doi.org/10.1038/sj.onc.1205592
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