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Inhibition of NK Cell Activity through TGF-1 by Down-Regulation of NKG2D in a Murine Model of Head and Neck Cancer¹

Santanu Dasgupta^*, Malaya Bhattacharya-Chatterjee^*, Bert W. O’Malley, Jr and Sunil K. Chatterjee^2,*

^* Department of Internal Medicine and the Barrett Cancer Center, University of Cincinnati, Cincinnati, OH 45267; and Department of Otorhinolaryngology, Head and Neck Surgery, University of Pennsylvania Health System, Philadelphia, PA 19104

In an orthotopic murine model of head and neck squamous cell carcinoma (SCC VII/SF) we studied NK cell-mediated immunity following vaccination with a recombinant vaccinia virus expressing IL-2 (rvv-IL-2). SCC VII/SF tumor cells were injected into the oral cavity of C3H/HeJ mice on day 0. Mice were vaccinated on days 7, 10, and 14 with rvv-IL-2 and control vaccines. Phenotypes, numbers, and biological activities of NK cells were determined following vaccination. Levels of expression of NK-activating receptor NKG2D and CD16 on NK cell surface were assayed in the vaccinated mice. Expression of NKG2D ligands, Rae1, and H60 on SCC VII/SF cells was also examined. Vaccination with rvv-IL-2 resulted in expansion of NK cells. NK cells isolated from rvv-IL-2-vaccinated mice had significantly higher biological activities compared with mice treated with control vaccines. NK cells from tumor-bearing mice expressed significantly lower levels of NKG2D and CD16 compared with rvv-IL-2 vaccinated mice. SCC VII/SF tumors expressed NKG2D ligand Rae 1, although H60 was not present. SCC VII/SF tumors expressed high levels of TGF-1, which were down-modulated by vaccination with rvv-IL-2. Incubation of NK cells with tumor homogenate or cultured supernatant of SCC VII/SF cells reduced the expression of NKG2D and CD16. This inhibition appeared to be mediated by TGF-1. SCC VII/SF tumors in the oral cavity of the mice secrete high quantities of TGF-1, which reduce the expression of NK cell receptor NKG2D as well as CD16 and inhibits biological functions of NK cells.

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