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Updated: May 6, 2026
Quantitative 3D In Silico Modeling q3DISM of Cerebral Amyloid-beta Phagocytosis in Rodent Models of Alzheimer's Disease
Published on: December 26, 2016
Microglial cGAS Deletion Preserves Intercellular Communication and Alleviates Amyloid-β-Induced Pathogenesis of
Sijia He1,2, Xin Li1, Namrata Mittra1
1Barshop Institute for Longevity and Aging Studies, University of Texas Health Science Center at San Antonio, San Antonio, TX, 78229, USA.
Abstract:
Innate immune activation plays a crucial role in the pathogenesis of Alzheimer's disease (AD) and related dementias (ADRD). The cytosolic DNA sensing pathway, involving cGAMP synthase (cGAS) and Stimulator of Interferon Genes (STING), has emerged as a key mediator of neurodegenerative diseases. However, the precise mechanisms through which cGAS activation influences AD progression remain poorly understood. In this study, we observed significant up-regulation of cGAS-STING signaling pathway in AD. Notably, this increase is primarily attributed to microglia, rather than non-microglial cell types. Using an inducible, microglia-specific cGAS knockout mouse model in the 5xFAD background, we demonstrated that deleting microglial cGAS at the onset of amyloid-β (Aβ) pathology profoundly restricts plaque accumulation and protects mice from Aβ-induced cognitive impairment. Mechanistically, our study revealed cGAS promotes plaque-associated microglia accumulation and is essential for inflammasome activation. Moreover, we showed that restricting cGAS-mediated innate immunity is crucial for preserving inter-cellular communication in the brain and induces pleiotrophin, a neuroprotective factor. These findings offer novel insights into the specific roles of the innate immune system in AD employing a cell-type-specific approach. The conclusions provide a foundation for targeted interventions to modulate the microglial cGAS-STING signaling pathway, offering promising therapeutic strategy for AD treatment.
Insights
Targeting the cGAS-STING pathway in microglia can combat Alzheimer's disease (AD). Deleting microglial cGAS reduces amyloid plaques and cognitive decline, offering a new therapeutic strategy for AD.
Area of Science:
- Neuroscience
- Immunology
- Genetics
Background:
- Alzheimer's disease (AD) pathogenesis involves innate immune activation.
- The cyclic GMP-AMP synthase (cGAS)-stimulator of interferon genes (STING) pathway is implicated in neurodegeneration.
- The specific role of microglial cGAS in AD progression is not fully understood.
Purpose of the Study:
- To investigate the role of the cGAS-STING signaling pathway in Alzheimer's disease.
- To determine the cell-type specificity of cGAS activation in AD.
- To explore therapeutic strategies targeting microglial cGAS in AD.
Main Methods:
- Analysis of cGAS-STING pathway activation in AD patient samples.
- Generation of an inducible, microglia-specific cGAS knockout mouse model (5xFAD background).
- Assessment of amyloid-beta (Aβ) pathology, cognitive function, microglial accumulation, inflammasome activation, and gene expression.
Main Results:
- Significant upregulation of the cGAS-STING pathway observed in AD, primarily in microglia.
- Microglial cGAS deletion ameliorated Aβ plaque accumulation and cognitive deficits in mice.
- cGAS deficiency prevented inflammasome activation and preserved inter-cellular communication, inducing pleiotrophin.
Conclusions:
- Microglial cGAS-STING signaling is a key driver of AD pathogenesis.
- Targeting microglial cGAS represents a promising therapeutic avenue for Alzheimer's disease.
- Cell-type-specific modulation of innate immunity offers novel treatment strategies for neurodegenerative diseases.
