Abstract
Breast cancer (BC) is an aggressive cancer that is a leading cause of cancer-associated death in women worldwide. Although increased expression of heat shock protein 47 (HSP47), a collagen-specific chaperone, is associated with the high malignancy of BC, its role in BC remains largely unclear. Here we show that a small population of high-invasive BC cells expresses HSP47 and that HSP47-positive high-invasive BC cells have a high metastatic potential that is completely abolished by disruption of HSP47. HSP47 interacts with non-muscle myosin IIA (NMIIA) via the unfolded protein response transducer IRE1α, resulting in enhancement of the metastatic potential of high-invasive BC cells by augmenting the contractile force of actin filaments. Ablation of NMIIA abrogates the metastatic potential of HSP47-positive high-invasive BC cells. We further show that forced expression of NMIIA confers a high metastatic potential on low-invasive BC cells in which HSP47 but not NMIIA is expressed. Overall, our study indicates that HSP47 acts as a stimulator for metastasis of BC cells and suggest that HSP47 may be a candidate for a therapeutic target against BC.
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Acknowledgements
The authors thank Dr Takayuki Sakurai (Shinshu University, Matsumoto, Japan) and Dr Norio Takei (Hokkaido University, Sapporo, Japan) for providing pCG-Sap I vector. The authors also thank Kaori Sakai-Sawada (Hokkaido University, Sapporo, Japan) for technical assistance of data acquisition in this study.
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Study design and concept: AY, KM, YT. Data acquisition: AY. Data analysis and interpretations: AY. Manuscript preparation: AY, YT. Manuscript review: AY, KM, YT. All authors read and approved the final manuscript. This work was supported by Nitto Denko Corporation (Osaka, Japan). This work was also supported in part by the Grant-in-Aid for Scientific Research C from MEXT Japan Society for the Promotion of Science (KAKENHI18K07287 to AY).
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All procedures of mouse experiments were reviewed and approved by Experimental Animal Ethics Committee of Hokkaido University.
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Yoneda, A., Minomi, K. & Tamura, Y. HSP47 promotes metastasis of breast cancer by interacting with myosin IIA via the unfolded protein response transducer IRE1α. Oncogene 39, 4519–4537 (2020). https://doi.org/10.1038/s41388-020-1311-7
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DOI: https://doi.org/10.1038/s41388-020-1311-7