CEACAM1 dampens antitumor immunity by down-regulating NKG2D ligand expression on tumor cells
Kuo, Timothy T.
Lanier, Lewis L.
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CitationChen, Zhangguo, Lanfen Chen, Kristi Baker, Torsten Olszak, Sebastian Zeissig, Yu-Hwa Huang, Timothy T. Kuo, Ofer Mandelboim, Nicole Beauchemin, Lewis L. Lanier, and Richard S. Blumberg. 2011. CEACAM1 dampens antitumor immunity by down-regulating NKG2D ligand expression on tumor cells. The Journal of Experimental Medicine 208(13): 2633-2640.
AbstractAlthough carcinoembryonic antigen (CEA)–related cell adhesion molecule 1 (CEACAM1)
has been viewed as a tumor suppressor, increasing clinical evidence shows that high levels of CEACAM1 expression on tumors correlates with poor prognosis and high risk of metastasis. Here, we examined the consequences of CEACAM1 expression on tumor cells. We show that tumor cell–associated CEACAM1 causes intracellular retention of various NKG2D ligands in mouse and human tumor cells. CEACAM1-silenced tumor cells expressed more cell surface NKG2D ligands and exhibited greater sensitivity to natural killer cell–mediated cytolysis in vitro and rejection in vivo. Our studies reveal a novel mechanism through which CEACAM1-bearing tumor cells may escape immune-surveillance.
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