Abstract
Background
Bone-marrow-derived haematopoietic stem and progenitor cells (HSPCs) are a prominent part of the highly complex tumour microenvironment (TME) where they localise within tumours and maintain haematopoietic potency. Understanding the role HSPCs play in tumour growth and response to radiation therapy (RT) may lead to improved patient treatments and outcomes.
Methods
We used a mouse model of non-small cell lung carcinoma where tumours were exposed to RT regimens alone or in combination with GW2580, a pharmacological inhibitor of colony stimulating factor (CSF)-1 receptor. RT-PCR, western blotting and immunohistochemistry were used to quantify expression levels of factors that affect HSPC differentiation. DsRed+ HSPC intratumoural activity was tracked using flow cytometry and confocal microscopy.
Results
We demonstrated that CSF-1 is enhanced in the TME following exposure to RT. CSF-1 signaling induced intratumoural HSPC differentiation into M2 polarised tumour-associated macrophages (TAMs), aiding in post-RT tumour survival and regrowth. In contrast, hyperfractionated/pulsed radiation therapy (PRT) and GW2580 ablated this process resulting in improved tumour killing and mouse survival.
Conclusions
Tumours coopt intratumoural HSPC fate determination via CSF-1 signaling to overcome the effects of RT. Thus, limiting intratumoural HSPC activity represents an attractive strategy for improving the clinical treatment of solid tumours.
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Data availability
All data are included in this published article and are available (GJM) upon reasonable request.
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Acknowledgements
The BRI animal facility staff and SG assisted with animal husbandry and tumour inoculations.
Funding
This work was supported by an OU Center for Biomedical Research grant (GJM) and OU Provost grant (TMP). Flow cytometry was performed in the OU Flow Cytometry Core, supported in part by a NSF-MRI (NSF-1919572) grant (LGV-D and GJM).
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GJM, GW, LGV-D and TMP conceived the project. TMP, KLB, AH and CP performed the experiments. TMP, KLB, MAB, SEH, RJW, LGV-D, GW and GJM provided resources and analysed data. TMP, GW, LGV-D and GJM were responsible for project management and compliance protocols. GJM, TMP, SEH, RJW and LGV-D wrote the paper. GW and KLB edited the manuscript.
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Animal experiments were approved by the BRI IACUC.
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The authors declare no competing interests.
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Parsons, T.M., Buelow, K.L., Hanna, A. et al. Intratumoural haematopoietic stem and progenitor cell differentiation into M2 macrophages facilitates the regrowth of solid tumours after radiation therapy. Br J Cancer 126, 927–936 (2022). https://doi.org/10.1038/s41416-021-01652-y
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DOI: https://doi.org/10.1038/s41416-021-01652-y
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