Abstract
Purpose
Multiple cell types of the tumour microenvironment, including macrophages, contribute to the response to cancer therapy. The anti-resorptive agent zoledronic acid (ZOL) has anti–tumour effects in vitro and in vivo, but it is not known to what extent macrophages are affected by this agent. We have therefore investigated the effects of ZOL on macrophages using a combination of in vitro and in vivo models.
Methods
J774 macrophages were treated with ZOL in vitro, alone and in combination with doxorubicin (DOX), and the levels of apoptosis and necrosis determined. Uptake of zoledronic acid was assessed by detection of unprenylated Rap1a in J774 macrophages in vitro, in peritoneal macrophages and in macrophage populations isolated from subcutaneously implanted breast cancer xenografts following ZOL treatment in vivo.
Results
Exposure of J774 macrophages to 5 μM ZOL for 24 h caused a significant increase in the levels of uRap1A, and higher doses/longer exposure induced apoptotic cell death. DOX (10 nM/24 h) and ZOL (10 μM/4 h) given in sequence induced significantly increased levels of apoptotic cell death compared to single agents. Peritoneal macrophages and macrophage populations isolated from breast tumour xenografts had detectable levels of uRap1A 24 h following a single, clinically achievable dose of 100 μg/kg ZOL in vivo.
Conclusion
We demonstrate that macrophages are sensitive to sequential administration of DOX and ZOL, and that both peritoneal and breast tumour associated macrophages rapidly take up ZOL in vivo. Our data support that macrophages may contribute to the anti-tumour effect of ZOL.
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Acknowledgments
This study was supported by a grant from Weston Park Hospital Cancer Charity, Sheffield, UK. Expert technical support was provided by Mrs Alyson Evans and Ms Sue Newton.
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The authors have no conflicting interests to declare in relation to this manuscript.
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Rogers, T.L., Wind, N., Hughes, R. et al. Macrophages as potential targets for zoledronic acid outside the skeleton—evidence from in vitro and in vivo models. Cell Oncol. 36, 505–514 (2013). https://doi.org/10.1007/s13402-013-0156-2
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DOI: https://doi.org/10.1007/s13402-013-0156-2