Microglial Self-Recognition STINGs in A-T Neurodegeneration
Austin Ferro1, Carrie Sheeler1, Marija Cvetanovic2
1Department of Neuroscience, University of Minnesota, 2101 6th Street South East, Minneapolis, MN 55455, USA.
Abstract:
Microglial inflammation is often seen as a secondary event in neurodegeneration. A recent study by Song et al. demonstrates that loss of ataxia telangiectasia mutated (ATM) activates microglia through the cytosolic DNA sensor STING. This highlights the ability of microglia to recognize and respond to self-DNA, with potentially neurotoxic consequences.
Insights
Loss of ataxia telangiectasia mutated (ATM) triggers microglial inflammation via the STING pathway. This study reveals microglia can detect self-DNA, potentially causing neurotoxicity in neurodegenerative diseases.
Area of Science:
- Neuroscience
- Immunology
- Genetics
Background:
- Microglial inflammation is typically considered a secondary response in neurodegeneration.
- The precise mechanisms initiating microglial activation in these contexts remain incompletely understood.
Purpose of the Study:
- To investigate the role of ataxia telangiectasia mutated (ATM) in microglial activation.
- To elucidate the signaling pathways involved in microglial responses to endogenous DNA.
Main Methods:
- Utilized genetic models with ATM deficiency.
- Examined the activation of microglia and the involvement of the cyclic guanosine monophosphate-adenosine monophosphate synthase (cGAS)-stimulator of interferon genes (STING) pathway.
Main Results:
- Loss of ATM leads to the activation of microglia.
- This activation is dependent on the cytosolic DNA sensor STING, indicating a response to self-DNA.
- The study demonstrates that microglia can recognize and respond to endogenous DNA fragments.
Conclusions:
- ATM plays a critical role in suppressing microglial activation by self-DNA.
- The cGAS-STING pathway is a key mediator of microglial inflammatory responses triggered by ATM loss.
- These findings suggest a novel mechanism linking DNA damage response pathways to neuroinflammation and potential neurotoxicity.
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