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Lifetime exposure to a soluble TGF-beta antagonist protects mice against metastasis without adverse side effects

  1. Author:
    Yang, Y. A.
    Dukhanina, O.
    Tang, B. W.
    Mamura, M.
    Letterio, J. J.
    MacGregor, J.
    Patel, S. C.
    Khozin, S.
    Liu, Z. Y.
    Green, J.
    Anver, M. R.
    Merlino, G.
    Wakefield, L. M.

  2. Author Address

    NCI, Lab Cell Regulat & Carcinogenesis, Bldg 41,Rm C629,41 Lib Dr,MSC 5055, Bethesda, MD 20892 USA NCI, Lab Cell Regulat & Carcinogenesis, Bethesda, MD 20892 USA NCI, Pathol & Histotechnol Lab, Sci Applicat Int Corp, Frederick, MD 21701 USA NCI, Mol Biol Lab, Bethesda, MD 20892 USA Wakefield LM NCI, Lab Cell Regulat & Carcinogenesis, Bldg 41,Rm C629,41 Lib Dr,MSC 5055, Bethesda, MD 20892 USA
    1. Year: 2002
  2. Journal: Journal of Clinical Investigation
    1. 109
    2. 12
    3. Pages: 1607-1615
  4. Type of Article: Article
  1. Abstract:

    TGF-betas play diverse and complex roles in many biological processes. In tumorigenesis, they can function either as tumor suppressors or as pro-oncogenic factors, depending on the stage of the disease. We have developed transgenic mice expressing a TGF-beta antagonist of the soluble type II TGF-beta receptor:Fc fusion protein class, under the regulation of the mammary- selective MMTV-LTR promoter/enhancer. Biologically significant levels of antagonist were detectable in the serum and most tissues of this mouse line. The mice were resistant to the development of metastases at multiple organ sites when compared with wild-type controls, both in a tail vein metastasis assay using isogenic melanoma cells and in crosses with the MMTV-neu transgenic mouse model of metastatic breast cancer. Importantly, metastasis from endogenous mammary tumors was suppressed without any enhancement of primary tumorigenesis. Furthermore, aged transgenic mice did not exhibit the severe pathology characteristic of TGF-beta null mice, despite lifetime exposure to the antagonist. The data suggest that in vivo the antagonist may selectively neutralize the undesirable TGF-beta associated with metastasis, while sparing the regulatory roles of TGF-betas in normal tissues. Thus this soluble TGF-beta antagonist has potential for long-term clinical use in the prevention of metastasis.

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