SorLA restricts TNFα release from microglia to shape a glioma-supportive brain microenvironment
Paulina Kaminska1,2, Peter L Ovesen3, Mateusz Jakiel1,4
1Faculty of Biology, University of Warsaw, 02-096, Warsaw, Poland.
EMBO Reports
|March 19, 2024
Summary
SorLA protein influences brain disease by regulating microglia function in glioblastoma. Loss of SorLA boosts microglial inflammation and hinders glioma growth.
Area of Science:
- Neuroscience
- Immunology
- Oncology
Background:
- SorLA (Sortilin Related Receptor 1) is an intracellular sorting receptor implicated in neuronal protein transport.
- Emerging evidence highlights SorLA's role in microglial function and brain disease pathogenesis, including glioblastoma (GBM).
- Glioma-associated microglia and macrophages (GAMs) in the GBM microenvironment are reprogrammed to support tumor progression, losing anti-tumor capabilities.
Purpose of the Study:
- To investigate the impact of SorLA on the functional properties of GAMs within the GBM microenvironment.
- To elucidate the mechanisms by which SorLA influences microglial inflammatory responses and their contribution to glioma progression.
Main Methods:
- Re-analysis of published single-cell RNA sequencing (scRNA-seq) data from GBM patients.
- In vitro studies using microglial cell models.
- In vivo experiments utilizing a murine model of glioma.
Main Results:
- GAM phenotypes in GBM correlate with SORL1 gene expression levels.
- SorLA was found to restrict the secretion of Tumor Necrosis Factor alpha (TNFα) from microglia, thereby limiting their inflammatory potential.
- Loss of SorLA in microglia led to an exacerbated pro-inflammatory response in a murine glioma model.
- SorLA deficiency resulted in suppressed tumor growth in the glioma model.
Conclusions:
- SorLA plays a critical role in modulating microglial function and inflammatory responses within the GBM microenvironment.
- SorLA acts as a negative regulator of microglial pro-inflammatory cytokine secretion, influencing glioma progression.
- Targeting SorLA may represent a potential therapeutic strategy to enhance anti-tumor immunity in glioblastoma.
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