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Bone metastasis from breast cancer involves elevated IL-11 expression and the gp130/STAT3 pathway

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Abstract

To evaluate the relationship between IL-11 and bone metastasis in patients with breast cancer and explore the potential molecular mechanism, total serum samples were collected from 180 breast cancer patients and 20 women without breast cancer. The serum expression level of interleukin (IL)-11, connective tissue growth factor (CTGF), transforming growth factor-β, and Tracp5b was determined by enzyme-linked immunosorbent assay, and mRNA expression of IL-11 in fresh breast cancer tissue was determined by RT-PCR. Immunohistochemical staining was used to detect the expression of IL-11 and CTGF in breast cancer tissue, and Western blot was used to detect the expression of p-38, p-C-JUN, p-STAT3, and p-gp130 in fresh breast cancer tissue. DNA-binding activity of AP-1 was examined by electrophoretic mobility shift assay. Differences were statistically analyzed between the group with breast cancer metastatic to bone (MBC-B) and the group with only primary breast cancer (PBC). Serum level and mRNA expression of IL-11 in the MBC-B group were significantly higher than those in the PBC group. IL-11 immunohistochemical staining showed that the percentage of positively stained cells in the MBC-B group (57.5 %) was significantly higher than that in the PBC group (14.29 %). Western blot analysis showed higher expression of p-p38, p-C-JUN, p-STAT3, and p-gp130 in the MBC-B group than in the PBC group. DNA-binding activity of AP-1 was significantly higher in the MBC-B group than in the PBC group. These data suggest that IL-11 is associated with bone metastasis and may be of value for predicting bone metastasis from breast cancer.

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Abbreviations

MBC-B:

Breast cancer metastatic to bone

PBC:

Primary breast cancer

TGF-β:

Transforming growth factor-β

CTGF:

Connective tissue growth factor

IHC:

Immunohistochemical staining

IL:

Interleukin

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Acknowledgments

This work was supported by the National Science Foundation of China (81071631), Tianjin Medical University Science Foundation (2010KY36), Key Project of Natural Science Foundation of Anhui Education Department (KJ2010A179). We also thank Dr. Zhuang Cui for his professional statistical suggestions.

Conflict of interest

The authors declare that they have no competing interests.

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Authors and Affiliations

  1. Department of Laboratory, Key Laboratory of Cancer Prevention and Therapy, Tianjin Medical University Cancer Institute and Hospital, Tianjin, 300060, People’s Republic of China

    Li Ren

  2. Department of Gastrointestinal Cancer, Tianjin Medical University Cancer Institute and Hospital, Tianjin, 300060, People’s Republic of China

    Xia Wang

  3. Department of Laboratory, Tianjin Medical University General Hospital, Tianjin, 300052, People’s Republic of China

    Zuoliang Dong

  4. Department of Medical Imaging, Tianjin Union Medicine Center, Nankai University Affiliated Hospital, Tianjin, 300191, People’s Republic of China

    Jun Liu

  5. Department of Pathology, Tianjin Union Medicine Center, Nankai University Affiliated Hospital, Tianjin, 300191, People’s Republic of China

    Shiwu Zhang

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  1. Li Ren
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  3. Zuoliang Dong
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  4. Jun Liu
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Correspondence to Li Ren.

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Li Ren and Xia Wang equally contributed to the paper.

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Ren, L., Wang, X., Dong, Z. et al. Bone metastasis from breast cancer involves elevated IL-11 expression and the gp130/STAT3 pathway. Med Oncol 30, 634 (2013). https://doi.org/10.1007/s12032-013-0634-4

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  • DOI: https://doi.org/10.1007/s12032-013-0634-4

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