NKG2D ligand expression in pediatric brain tumors.

Abstract:

:Adult brain tumors establish an immunosuppressive tumor microenvironment as a modality of immune escape, with several immunotherapies designed to overcome this barrier. However, the relationship between tumor cells and immune cells in pediatric brain tumor patients is not as well-defined. In this study, we sought to determine whether the model of immune escape observed in adult brain tumors is reflected in patients with pediatric brain tumors by evaluating NKG2D ligand expression on tissue microarrays created from patients with a variety of childhood brain tumor diagnoses, and infiltration of Natural Killer and myeloid cells. We noted a disparity between mRNA and protein expression for the 8 known NKG2D ligands. Surprisingly, high-grade gliomas did not have increased NKG2D ligand expression compared to normal adjacent brain tissue, nor did they have significant myeloid or NK cell infiltration. These data suggest that pediatric brain tumors have reduced NK cell-mediated immune surveillance, and a less immunosuppressive tumor microenvironment as compared to their adult counterparts. These data indicate that therapies aimed to improve NK cell trafficking and functions in pediatric brain tumors may have a greater impact on anti-tumor immune responses and patient survival, with fewer obstacles to overcome.

journal_name

Cancer Biol Ther

journal_title

Cancer biology & therapy

authors

Haberthur K,Brennan K,Hoglund V,Balcaitis S,Chinn H,Davis A,Kreuser S,Winter C,Leary SE,Deutsch GH,Ellenbogen RG,Crane CA

doi

10.1080/15384047.2016.1250047

subject

Has Abstract

pub_date

2016-12-01 00:00:00

pages

1253-1265

issue

12

eissn

1538-4047

issn

1555-8576

journal_volume

17

pub_type

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