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A rat model of ataxia-telangiectasia: evidence for a neurodegenerative phenotype.

Authors: Quek, Hazel  Luff, John  Cheung, KaGeen  Kozlov, Sergei  Gatei, Magtouf  Lee, C Soon  Bellingham, Mark C  Noakes, Peter G  Lim, Yi Chieh  Barnett, Nigel L  Dingwall, Steven  Wolvetang, Ernst  Mashimo, Tomoji  Roberts, Tara L  Lavin, Martin F 
Citation: Quek H, etal., Hum Mol Genet. 2017 Jan 1;26(1):109-123. doi: 10.1093/hmg/ddw371.
Pubmed: (View Article at PubMed) PMID:28007901
DOI: Full-text: DOI:10.1093/hmg/ddw371

Ataxia-telangiectasia (A-T), an autosomal recessive disease caused by mutations in the ATM gene is characterised by cerebellar atrophy and progressive neurodegeneration which has been poorly recapitulated in Atm mutant mice. Consequently, pathways leading to neurodegeneration in A-T are poorly understood. We describe here the generation of an Atm knockout rat model that does not display cerebellar atrophy but instead paralysis and spinal cord atrophy, reminiscent of that seen in older patients and milder forms of the disorder. Loss of Atm in neurons and glia leads to accumulation of cytosolic DNA, increased cytokine production and constitutive activation of microglia consistent with a neuroinflammatory phenotype. Rats lacking ATM had significant loss of motor neurons and microgliosis in the spinal cord, consistent with onset of paralysis. Since short term treatment with steroids has been shown to improve the neurological signs in A-T patients we determined if that was also the case for Atm-deficient rats. Betamethasone treatment extended the lifespan of Atm knockout rats, prevented microglial activation and significantly decreased neuroinflammatory changes and motor neuron loss. These results point to unrepaired damage to DNA leading to significant levels of cytosolic DNA in Atm-deficient neurons and microglia and as a consequence activation of the cGAS-STING pathway and cytokine production. This in turn would increase the inflammatory microenvironment leading to dysfunction and death of neurons. Thus the rat model represents a suitable one for studying neurodegeneration in A-T and adds support for the use of anti-inflammatory drugs for the treatment of neurodegeneration in A-T patients.

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CRRD Object Information
CRRD ID: 12879399
Created: 2017-04-18
Species: All species
Last Modified: 2017-04-18
Status: ACTIVE



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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.