Elevated HLA-E levels in human glioblastomas but not in grade I to III astrocytomas correlate with infiltrating CD8+ cells |
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Authors: | Mittelbronn Michel Simon Perikles Löffler Christian Capper David Bunz Benedikt Harter Patrick Schlaszus Holger Schleich Ariane Tabatabai Ghazaleh Goeppert Benjamin Meyermann Richard Weller Michael Wischhusen Jörg |
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Institution: | Institute of Brain Research, University of Tuebingen, Calwerstr. 3, D-72076 Tuebingen, Germany. michel-guy-andr.mittelbronn@med.uni-tuebingen.de |
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Abstract: | HLA-E is a ligand for the immune-inhibitory NKG2A receptor expressed on NK and T cells. To investigate HLA-E expression and immune cell infiltration in human astrocytic tumors in vivo, we analyzed normal CNS controls and astrocytomas of all WHO grades by immunohistochemistry. Both, CD8(+) immune cell infiltration and HLA-E expression were significantly higher in astrocytic tumors than in normal brain. Further, HLA-E expression levels and immune cell infiltration were significantly correlated in WHO grade IV glioblastomas. Thus, HLA-E overexpression in glioblastomas may be triggered by T and NK cell infiltration. |
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