Paul R Gielen1, Barbara M Schulte1, Esther D Kers-Rebel1, Kiek Verrijp1, Sandra A J F H Bossman1, Mark Ter Laan1, Pieter Wesseling1, Gosse J Adema2. 1. Tumor Immunology Laboratory, Radboud Institute for Molecular Life Sciences, Nijmegen, the Netherlands (P.R.G., B.M.S., E.D.K.-R., G.J.A.); Department of Pathology, Radboud University Medical Center, Nijmegen, the Netherlands (K.V., P.W.); Department of Neurosurgery, Radboud University Medical Center, Nijmegen, the Netherlands (S.A.J.H.B., M.L.); Department of Pathology, VU University Medical Center, Amsterdam, the Netherlands (P.W.). 2. Tumor Immunology Laboratory, Radboud Institute for Molecular Life Sciences, Nijmegen, the Netherlands (P.R.G., B.M.S., E.D.K.-R., G.J.A.); Department of Pathology, Radboud University Medical Center, Nijmegen, the Netherlands (K.V., P.W.); Department of Neurosurgery, Radboud University Medical Center, Nijmegen, the Netherlands (S.A.J.H.B., M.L.); Department of Pathology, VU University Medical Center, Amsterdam, the Netherlands (P.W.) gosse.adema@radboudumc.nl.
Abstract
BACKGROUND: Gliomas are primary brain tumors that are associated with a poor prognosis. The introduction of new treatment modalities (including immunotherapy) for these neoplasms in the last 3 decades has resulted in only limited improvement in survival. Gliomas are known to create an immunosuppressive microenvironment that hampers the efficacy of (immuno)therapy. One component of this immunosuppressive environment is the myeloid-derived suppressor cell (MDSC). METHODS: We set out to analyze the presence and activation state of MDSCs in blood (n = 41) and tumor (n = 20) of glioma patients by measuring S100A8/9 and arginase using flow cytometry and qPCR. Inhibition of T cell proliferation and cytokine production after stimulation with anti-CD3/anti-CD28 coated beads was used to measure in vitro MDSC suppression capacity. RESULTS: We report a trend toward a tumor grade-dependent increase of both monocytic (M-) and polymorphonuclear (PMN-) MDSC subpopulations in the blood of patients with glioma. M-MDSCs of glioma patients have increased levels of intracellular S100A8/9 compared with M-MDSCs in healthy controls (HCs). Glioma patients also have increased S100A8/9 serum levels, which correlates with increased arginase activity in serum. PMN-MDSCs in both blood and tumor tissue demonstrated high expression of arginase. Furthermore, we assessed blood-derived PMN-MDSC function and showed that these cells have potent T cell suppressive function in vitro. CONCLUSIONS: These data indicate a tumor grade-dependent increase of MDSCs in the blood of patients with a glioma. These MDSCs exhibit an increased activation state compared with MDSCs in HCs, independent of tumor grade.
BACKGROUND:Gliomas are primary brain tumors that are associated with a poor prognosis. The introduction of new treatment modalities (including immunotherapy) for these neoplasms in the last 3 decades has resulted in only limited improvement in survival. Gliomas are known to create an immunosuppressive microenvironment that hampers the efficacy of (immuno)therapy. One component of this immunosuppressive environment is the myeloid-derived suppressor cell (MDSC). METHODS: We set out to analyze the presence and activation state of MDSCs in blood (n = 41) and tumor (n = 20) of gliomapatients by measuring S100A8/9 and arginase using flow cytometry and qPCR. Inhibition of T cell proliferation and cytokine production after stimulation with anti-CD3/anti-CD28 coated beads was used to measure in vitro MDSC suppression capacity. RESULTS: We report a trend toward a tumor grade-dependent increase of both monocytic (M-) and polymorphonuclear (PMN-) MDSC subpopulations in the blood of patients with glioma. M-MDSCs of gliomapatients have increased levels of intracellular S100A8/9 compared with M-MDSCs in healthy controls (HCs). Gliomapatients also have increased S100A8/9 serum levels, which correlates with increased arginase activity in serum. PMN-MDSCs in both blood and tumor tissue demonstrated high expression of arginase. Furthermore, we assessed blood-derived PMN-MDSC function and showed that these cells have potent T cell suppressive function in vitro. CONCLUSIONS: These data indicate a tumor grade-dependent increase of MDSCs in the blood of patients with a glioma. These MDSCs exhibit an increased activation state compared with MDSCs in HCs, independent of tumor grade.
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