Published in:
Open Access
01-12-2024 | Glioma | Research
Tumor associated microglia/macrophages utilize GPNMB to promote tumor growth and alter immune cell infiltration in glioma
Authors:
Fatih Yalcin, Hannah Haneke, Ibrahim E. Efe, Leonard D. Kuhrt, Edyta Motta, Bernadette Nickl, Charlotte Flüh, Michael Synowitz, Omar Dzaye, Michael Bader, Helmut Kettenmann
Published in:
Acta Neuropathologica Communications
|
Issue 1/2024
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Abstract
Tumor-associated microglia and blood-derived macrophages (TAMs) play a central role in modulating the immune suppressive microenvironment in glioma. Here, we show that GPNMB is predominantly expressed by TAMs in human glioblastoma multiforme and the murine RCAS-PDGFb high grade glioma model. Loss of GPNMB in the in vivo tumor microenvironment results in significantly smaller tumor volumes and generates a pro-inflammatory innate and adaptive immune cell microenvironment. The impact of host-derived GPNMB on tumor growth was confirmed in two distinct murine glioma cell lines in organotypic brain slices from GPNMB-KO and control mice. Using published data bases of human glioma, the elevated levels in TAMs could be confirmed and the GPNMB expression correlated with a poorer survival.