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Loss of the ataxia–telangiectasia gene product causes oxidative damage in target organs

By Carrolee Barlow, Phyllis A. Dennery, Mark K. Shigenaga, Mark A. Smith, Jason D. Morrow, L. Jackson Roberts, Anthony Wynshaw-Boris and Rodney L. Levine

Abstract

Ataxia–telangiectasia (A-T) is characterized by a markedly increased sensitivity to ionizing radiation, increased incidence of cancer, and neurodegeneration, especially of the cerebellar Purkinje cells. Ionizing radiation oxidizes macromolecules and causes tissue damage through the generation of reactive oxygen species (ROS). We therefore hypothesized that A-T is due to oxidative damage resulting from loss of function of the A-T gene product. To assess this hypothesis, we employed an animal model of A-T, the mouse with a disrupted Atm gene. We show that organs which develop pathologic changes in the Atm-deficient mice are targets of oxidative damage, and that cerebellar Purkinje cells are particularly affected. These observations provide a mechanistic basis for the A-T phenotype and lay a rational foundation for therapeutic intervention

Topics: Biological Sciences
Publisher: The National Academy of Sciences
Year: 1999
OAI identifier: oai:pubmedcentral.nih.gov:22310
Provided by: PubMed Central
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