ATM kinase inhibition in glial cells activates the innate immune response and causes neurodegeneration in Drosophila.

Proceedings of the National Academy of Sciences of the United States of America
Andrew J PetersenDavid A Wassarman

Abstract

To investigate the mechanistic basis for central nervous system (CNS) neurodegeneration in the disease ataxia-telangiectasia (A-T), we analyzed flies mutant for the causative gene A-T mutated (ATM). ATM encodes a protein kinase that functions to monitor the genomic integrity of cells and control cell cycle, DNA repair, and apoptosis programs. Mutation of the C-terminal amino acid in Drosophila ATM inhibited the kinase activity and caused neuron and glial cell death in the adult brain and a reduction in mobility and longevity. These data indicate that reduced ATM kinase activity is sufficient to cause neurodegeneration in A-T. ATM kinase mutant flies also had elevated expression of innate immune response genes in glial cells. ATM knockdown in glial cells, but not neurons, was sufficient to cause neuron and glial cell death, a reduction in mobility and longevity, and elevated expression of innate immune response genes in glial cells, indicating that a non-cell-autonomous mechanism contributes to neurodegeneration in A-T. Taken together, these data suggest that early-onset CNS neurodegeneration in A-T is similar to late-onset CNS neurodegeneration in diseases such as Alzheimer's in which uncontrolled inflammatory response mediated...Continue Reading

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