Acta Neuropathologica

, Volume 119, Issue 2, pp 249–259

Oxidative stress induced by loss of Cu,Zn-superoxide dismutase (SOD1) or superoxide-generating herbicides causes axonal degeneration in mouse DRG cultures

Original Paper

Abstract

Axonal degeneration is a common pathologic feature in peripheral neuropathy, neurodegenerative disease, and normal aging. Oxidative stress may be an important mechanism of axonal degeneration, but is underrepresented among current experimental models. To test the effects of loss of the antioxidant enzyme Cu,Zn-superoxide dismutase (SOD1) on axon survival, we cultured dorsal root ganglion (DRG) neurons from SOD1 knockout mice. Beginning as early as 48–72 h, we observed striking degeneration of Sod1−/− axons that was prevented by introduction of human SOD1 and was attenuated by antioxidant treatment. To test susceptibility to increased superoxide production, we exposed wild-type DRGs to the redox-cycling herbicides paraquat and diquat (DQ). Dose-dependent axon degeneration was observed, and toxicity of DQ was exacerbated by SOD1 deficiency. MTT staining suggested that DRG axons are more susceptible to injury than their parent cell bodies in both paradigms. Taken together, these data demonstrate susceptibility of DRG axons to oxidative stress-mediated injury due to loss of SOD1 or excess superoxide production. These in vitro models provide a novel means of investigating oxidative stress-mediated injury to axons, to improve our understanding of axonal redox control and dysfunction in peripheral neuropathy.

Keywords

Axon Axonal degeneration Oxidative stress Neuropathy Superoxide dismutase Dorsal root ganglion 

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  1. 1.Department of NeurologyEmory University School of MedicineAtlantaUSA
  2. 2.Departments of Neurology, Pathology and Laboratory MedicineEmory University School of MedicineAtlantaUSA
  3. 3.Emory Center for Neurodegenerative DiseaseAtlantaUSA

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