Abstract
Insulin-like growth factor binding protein-3 (IGFBP-3) is an important carrier protein for insulin-like growth factors (IGFs) in the circulation. IGFBP-3 antagonizes the growth-promoting and anti-apoptotic activities of IGFs in experimental systems, but in certain contexts can increase IGF bioactivity, probably by increasing its half-life. The goal of this study was to investigate the role of IGFBP-3 in breast carcinogenesis and breast cancer metastasis. In the first part of the study, we exposed IGFBP-3 knockout and wild-type female mice to dimethylbenz[a]anthracene (DMBA) and followed them for appearance of primary tumors for up to 13 months. In the second part, mice of each genotype received an IV injection of 4T1 mammary carcinoma cells and then lung nodules were counted. Our results show that IGFBP-3 knockout mice developed breast tumors significantly earlier than the wild-type (13.9 ± 1.1 versus 22.5 ± 3.3 weeks, respectively, P = 0.0144), suggesting tumor suppression activity of IGFBP-3. In tumors of IGFBP-3 knockout mice, levels of phospho-AKTSer473 were increased compared to wild-type mice. The lung metastasis assay showed significantly more and larger lung nodules in IGFBP-3 knockout mice than in wild-type mice. While we observed increased levels of IGFBP-5 protein in the IGFBP-3 knockout mice, our findings suggest that this was not sufficient to completely compensate for the absence of IGFBP-3. Even though knockout of IGFBP-3 is associated with only a subtle phenotype under control conditions, our results reveal that loss of this gene has measurable effects on breast carcinogenesis and breast cancer metastasis.
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Acknowledgments
We would like to thank Ms. Véronique Michaud and Mr. Yvhans Chery for their technical assistance with the animal care, Dr. Naciba Benlimame and Ms. Lilian Canetti for their collaboration for the immunohistochemistry procedures and Ms Jasmin Sander for the scanning of the slides. We are also grateful to Ms. Rhoda Lim for her help in the submission of this manuscript.
Conflict of interest
Dr. David R. Powell is the Vice-President of Metabolism Research at Lexicon Pharmaceuticals, Inc., of which the knockout mice were generated. The other authors have no conflict of interest to disclose.
Funding
Miguel Bazile was supported through the McGill Integrated Cancer Research Training Program Studentship.
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Blouin, MJ., Bazile, M., Birman, E. et al. Germ line knockout of IGFBP-3 reveals influences of the gene on mammary gland neoplasia. Breast Cancer Res Treat 149, 577–585 (2015). https://doi.org/10.1007/s10549-015-3268-8
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DOI: https://doi.org/10.1007/s10549-015-3268-8