Abstract
Cancer-induced bone pain (CIBP) is a common clinical problem in breast cancer patients with bone metastasis. Recent studies shows chemokines are novel targets for treatment of CIBP. In this study, we intra-tibial inoculated with Walker 256 rat mammary gland carcinoma cells into rat bone to established metastatic breast cancer. Then we measured the expression of CXCL10 in the spinal cord of metastatic bone cancer rats, investigated the role of CXCL10 in the development of CIBP, and the underlying mechanism. Results revealed that after intra-tibial inoculation with Walker 256 cells, rats showed up-regulation of CXCL10 and its receptor CXCR3 in the spinal cord. Interestingly, intrathecally injection of recombinant CXCL10 protein induced mechanical allodynia in naïve rats. Blocking the function of CXCL10/CXCR3 pathway via anti-CXCL10 antibody or CXCR3 antagonist prevented the development of CIBP and microglial activation. Moreover, CXCL10-induced mechanical allodynia was rescued by minocycline treatment during the late-stage of CIBP, days 10–14. The regulation of CXCL10 expression involved microglial activation in a manner of autocrine positive feedback. These results suggest that CXCL10 may be a necessary algogenic molecule, especially in the development of CIBP. Its function was partly mediated via spinal microglial activation. This study provides a novel insight into the biological function of chemokine CXCL10 in the molecular mechanism underlying cancer pain. It also provides new target for clinical treatment of metastatic breast cancer-induced bone pain in future.
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Abbreviations
- CXCL10:
-
C-X-C motif chemokine 10
- CXCR3:
-
C-X-C motif chemokine receptor 3
- rrCXCL10:
-
recombinant rat CXCL10 protein
- GAPDH:
-
glyceraldehyde-3-phosphate dehydrogenase
- CIBP:
-
cancer-induced bone pain
- PWTs:
-
paw withdrawal thresholds
- HPβCD:
-
2-Hydroxypropyl-β-cyclodextrin
- MC:
-
minocycline
- CD11b:
-
integrin alpha M chain, a special molecule in microglia
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Acknowledgments
We are grateful to Amgen for kindly providing AMG487 to us. We also gratefully acknowledge the expertise of Ms. Amber Chen (Project Intern, Department of Neuroscience, Baylor College of Medicine, USA) in the proof-reading of the manuscript. This work was supported by grants from the Natural Science Foundation of China (Nos. 81070890, 30872441, 81371250, 81171259, 81100832 and 30901395), and also supported by 2010 Clinical Key Disciplines Construction Grant from the Ministry of Health of China.
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The authors declare that they do not have financial relationships with any of the organizations that sponsored the research, and they do not have any other real or apparent conflict(s) of interest that may have a direct bearing on the subject matter of the article.
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Huilian Bu and Bin Shu contributed equally to this work.
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Bu, H., Shu, B., Gao, F. et al. Spinal IFN-γ-induced protein-10 (CXCL10) mediates metastatic breast cancer-induced bone pain by activation of microglia in rat models. Breast Cancer Res Treat 143, 255–263 (2014). https://doi.org/10.1007/s10549-013-2807-4
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DOI: https://doi.org/10.1007/s10549-013-2807-4