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Tumors skew endothelial cells to disrupt NK cell, T-cell and macrophage functions

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Abstract

Introduction

Patients and mice with solid tumors, such as Lewis lung carcinoma (LLC), have defects in functions of immune effector cells. Endothelial cells, a component of the tumor vasculature, are potential regulators of immune cell functions. Therefore, these studies examined the impact of exposure to LLC tumor on the ability of endothelial cells to modulate immune cell functions.

Materials and methods

Endothelial cells were pre-treated with LLC tumor-conditioned medium (EndoT-sup) for 24 h. Control endothelial cells that were exposed to medium (EndoMedia) or epithelial cell-conditioned medium (EndoEpi-sup). After the initial 24 h incubation, endothelial cells were washed and fresh media was added. Cells were allowed to incubate for an additional 24 h. Supernatants from EndoMedia, EndoEpi-sup or EndoT-sup were collected and assayed for immune modulatory products and for immune modulatory activity.

Results

Supernatant from EndoT-sup contained increased levels of PGE2, IL-6 and VEGF as compared to EndoMedia and EndoEpi-sup controls. NK cell activity, as measured by TNF-α and IFN-γ secretion, was increased following exposure to media conditioned by EndoMedia and EndoEpi-sup. Exposure of NK cells to supernatants of EndoT-sup, also increases TNF-α and IFN-γ secretion, but to a lesser extent than by EndoMedia and EndoEpi-sup. Examination of macrophage functions demonstrated that supernatant from EndoT-sup decreased microbead phagocytosis and increased production of the immune suppressive mediators, IL-10 and PGE2. Lastly, T-cell responses to stimulation with anti-CD3 in the presence of supernatants from EndoT-sup were examined. IFN-γ production by CD8+ T-cells was reduced after exposure to EndoT-sup-conditioned medium, as compared to cells treatments with medium or control conditioned medium. Production of IFN-γ by CD4+ T-cells exposed to EndoT-sup was not altered.

Conclusions

Taken together, these studies demonstrate that tumors skew endothelial cells to disrupt NK cell, T-cell and macrophages functions, and represents a novel mechanism of tumor-induced immune suppression.

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Acknowledgments

This work was supported by the Research Service of the Department of Veterans Affairs and by grants R01CA85266 and R01CA97813 from the National Institutes of Health to MRIY.

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Correspondence to M. Rita I. Young.

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Mulligan, J.K., Lathers, D.M.R. & Young, M.R.I. Tumors skew endothelial cells to disrupt NK cell, T-cell and macrophage functions. Cancer Immunol Immunother 57, 951–961 (2008). https://doi.org/10.1007/s00262-007-0425-x

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  • DOI: https://doi.org/10.1007/s00262-007-0425-x

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