Anti-transforming growth factor (TGF)-beta antibodies inhibit breast cancer cell tumorigenicity and increase mouse spleen natural killer cell activity. Implications for a possible role of tumor cell/host TGF-beta interactions in human breast cancer progression.

Arteaga CL, Hurd SD, Winnier AR, Johnson MD, Fendly BM, Forbes JT
J Clin Invest. 1993 92 (6): 2569-76

PMID: 7504687 · PMCID: PMC288452 · DOI:10.1172/JCI116871

TGF-beta effects on angiogenesis, stroma formation, and immune function suggest its possible involvement in tumor progression. This hypothesis was tested using the 2G7 IgG2b, which neutralizes TGF-beta 1, -beta 2, and -beta 3, and the MDA-231 human breast cancer cell line. Inoculation of these cells in athymic mice decreases mouse spleen natural killer (NK) cell activity. Intraperitoneal injections of 2G7 starting 1 d after intraperitoneal inoculation of tumor cells suppressed intraabdominal tumor and lung metastases, whereas the nonneutralizing anti-TGF-beta 12H5 IgG2a had no effect. 2G7 transiently inhibited growth of established MDA-231 subcutaneous tumors. Histologically, both 2G7-treated and control tumors were identical. Intraperitoneal administration of 2G7 resulted in a marked increase in mouse spleen NK cell activity. 2G7 did not inhibit MDA-231 primary tumor or metastases formation, nor did it stimulate NK cell-mediated cytotoxicity in beige NK-deficient nude mice. Finally, serum-free conditioned medium from MDA-231 cells inhibited the NK cell activity of human blood lymphocytes. This inhibition was blocked by the neutralizing anti-TGF-beta 2G7 antibody but not by a nonspecific IgG2. These data support a possible role for tumor cell TGF-beta in the progression of mammary carcinomas by suppressing host immune surveillance.

MeSH Terms (22)

Animals Antibodies Breast Neoplasms Cell Division Collagen Cytotoxicity, Immunologic Factor VIII Female Humans Immunoglobulin G Killer Cells, Natural Lung Neoplasms Mice Mice, Nude Neoplasm Metastasis Neoplasm Transplantation Neovascularization, Pathologic Recombinant Proteins Spleen Transforming Growth Factor beta Transplantation, Heterologous Tumor Cells, Cultured

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