Stroke drives glioma progression through the emergence of tumor-associated astrocytes with reduced Ca(2+) activity.

Stroke promotes glioma progression by inducing tumor-associated astrocytes with reduced Ca(2+) activity, leading to decreased survival in human and mouse models.

• Why it matters: Understanding how brain injury influences glioma growth is crucial because stroke survivors are at higher risk of developing malignant brain tumors, yet the underlying mechanisms are not well understood.
• What they did: The study examined glioma models and found that stroke causes remodeling of the tumor microenvironment, including the emergence of astrocytes with diminished Ca(2+) signaling and increased tumor-associated microglia and macrophages, with key roles for SLC4A4 and CCL2.
• The result: Restoring astrocytic Ca(2+) activity or depleting TAMs suppressed glioma progression, highlighting potential therapeutic targets to mitigate stroke-related tumor growth and improve patient outcomes.