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Supplementary Figures 1-5, Table 1 from Transforming Growth Factor β Subverts the Immune System into Directly Promoting Tumor Growth through Interleukin-17

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posted on 2023-03-30, 18:12 authored by Jeong-Seok Nam, Masaki Terabe, Mi-Jin Kang, Helen Chae, Nga Voong, Yu-an Yang, Arian Laurence, Aleksandra Michalowska, Mizuko Mamura, Scott Lonning, Jay A. Berzofsky, Lalage M. Wakefield
Supplementary Figures 1-5, Table 1 from Transforming Growth Factor β Subverts the Immune System into Directly Promoting Tumor Growth through Interleukin-17

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ARTICLE ABSTRACT

Overexpression of the immunosuppressive cytokine transforming growth factor β (TGF-β) is one strategy that tumors have developed to evade effective immunesurveillance. Using transplantable models of breast and colon cancer, we made the unexpected finding that CD8+ cells in tumor-bearing animals can directly promote tumorigenesis, by a mechanism that is dependent on TGF-β. We showed that CD8+ splenocytes from tumor-bearing mice expressed elevated interleukin (IL)-17 when compared with naive mice, and that CD8+ T cells could be induced to make IL-17 on addition of TGF-β and IL-6 in vitro. Treatment of mice with anti–TGF-β antibodies in vivo reduced IL-17 expression both in the tumor and the locoregional lymph nodes. Although IL-17 has not previously been shown to act as a survival factor for epithelial cells, we found that IL-17 suppressed apoptosis of several tumor cell lines in vitro, suggesting that this altered T-cell polarization has the potential to promote tumorigenesis directly, rather than indirectly through inflammatory sequelae. Consistent with this hypothesis, knockdown of the IL-17 receptor in 4T1 mouse mammary cancer cells enhanced apoptosis and decreased tumor growth in vivo. Thus, in addition to suppressing immune surveillance, tumor-induced TGF-β may actively subvert the CD8+ arm of the immune system into directly promoting tumor growth by an IL-17–dependent mechanism. [Cancer Res 2008;68(10):3915–23]

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