Molecular neurobiologyApr 28, 2026

Blocking a Brain Immune Pathway May Improve Brain Injury and Long-Term Fluid Buildup Symptoms in Mice with Brain Bleeding

Longevity & Aging Weekly Brief ↗PubMed ↗DOI ↗

Updated Apr 29, 2026

Abstract

Pharmacological inhibition or genetic removal of cGAS reduced neuroinflammation and neuronal damage after intraventricular hemorrhage.

Sustained activation of the cGAS-STING pathway in microglia following intraventricular hemorrhage may drive persistent neuroinflammation.
Double-stranded DNA from dying neurons and dysfunctional mitochondrial recycling in microglia can trigger the cGAS pathway.
Inhibition of cGAS led to reduced activation of microglia and decreased release of inflammatory cytokines associated with neuroinflammation.
These interventions were linked to less neuronal damage, reduced apoptosis, and improved neurological outcomes related to hydrocephalus.

Simplified

Post-hemorrhagic hydrocephalus (PHH) represents a prevalent clinical form of hydrocephalus, where surgical interventions frequently fail or result in severe complications. While current research underscores the role of innate immunity and neuroinflammation in PHH pathogenesis, the precise mechanisms remain elusive. The cyclic guanylate adenylates synthase-stimulator of interferon genes (cGAS-STING) pathway, a pivotal component of innate immunity, has been implicated in various neuroinflammatory disorders. However, its mechanism of action in PHH has not yet been explored. Here, we propose that sustained activation of the cGAS-STING pathway in microglia following intraventricular hemorrhage (IVH) drives persistent neuroinflammation. Our results showed that dsDNA released from pyroptotic neurons and impaired mitochondrial autophagy in microglia can serve as substrates for cGAS detection, forming a cascade of interconnected pathways. Pharmacological inhibition or conditional knockout of cGAS attenuated global neuroinflammation, suppressed microglial activation, and reduced both pyroptosis-dependent (IL-1β and IL-18) and nonpyroptosis-dependent (TNF-α, IFN-β, and IL-6) cytokine release. Additionally, these interventions mitigated neuronal damage, apoptosis, and hydrocephalus-related neurological deficits after IVH Our results demonstrate that cGAS-STING pathway activation, mediated by neuronal pyroptosis and microglial mitophagy dysfunction, perpetuates post-IVH neuroinflammation. Our findings suggest that targeting cGAS may serve as a promising therapeutic approach for PHH.

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Blocking a Brain Immune Pathway May Improve Brain Injury and Long-Term Fluid Buildup Symptoms in Mice with Brain Bleeding

Abstract

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