Tumor-Associated Microglia Secrete Extracellular ATP to Support Glioblastoma Progression

Area of Science:

• Neuro-oncology
• Cancer Immunology
• Cancer Metabolism

Background:

• Glioblastoma (GBM) is an aggressive brain tumor with poor outcomes.
• Tumor-associated microglia and macrophages (TAMs) are key immune cells in the GBM microenvironment.
• TAMs exhibit functional heterogeneity, influencing glioma progression.

Purpose of the Study:

• To investigate the metabolic reprogramming of TAMs in GBM.
• To elucidate the role of TAM-derived extracellular ATP (eATP) in GBM.
• To evaluate the therapeutic potential of targeting the eATP-P2X7R axis.

Main Methods:

• Bulk and single-cell RNA sequencing on GBM patient samples.
• In vitro and in vivo GBM models.
• Analysis of TAM mitochondrial activity, eATP production, and P2X7R signaling.

Main Results:

• TAMs in the GBM core show increased ATP synthase and oxidative phosphorylation.
• GBM cells enhance TAM mitochondrial activity, glucose uptake, and eATP production.
• Elevated eATP activates P2X7R on glioma cells, promoting tumor growth and invasion.

Conclusions:

• TAMs in GBM undergo metabolic changes that increase eATP secretion.
• The eATP-P2X7R axis drives GBM progression.
• Targeting this axis is a potential therapeutic strategy for GBM.