1. Tumor associated microglia/macrophages utilize GPNMB to promote tumor growth and alter immune cell infiltration in glioma
- Author
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Fatih Yalcin, Hannah Haneke, Ibrahim E. Efe, Leonard D. Kuhrt, Edyta Motta, Bernadette Nickl, Charlotte Flüh, Michael Synowitz, Omar Dzaye, Michael Bader, and Helmut Kettenmann
- Subjects
Microglia ,Macrophage ,GPNMB ,RCAS ,Experimental glioma ,Mouse ,Neurology. Diseases of the nervous system ,RC346-429 - Abstract
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.
- Published
- 2024
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