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Proc Natl Acad Sci U S A. 2014 Mar 18;111(11):E1035-42. doi: 10.1073/pnas.1401595111. Epub 2014 Mar 3.

Blood-spinal cord barrier disruption contributes to early motor-neuron degeneration in ALS-model mice.

Author information

1
Zilkha Neurogenetic Institute, Center for Neurodegeneration and Regeneration, Department of Physiology and Biophysics, University of Southern California, Los Angeles, CA 90089.

Abstract

Humans with ALS and transgenic rodents expressing ALS-associated superoxide dismutase (SOD1) mutations develop spontaneous blood-spinal cord barrier (BSCB) breakdown, causing microvascular spinal-cord lesions. The role of BSCB breakdown in ALS disease pathogenesis in humans and mice remains, however, unclear, although chronic blood-brain barrier opening has been shown to facilitate accumulation of toxic blood-derived products in the central nervous system, resulting in secondary neurodegenerative changes. By repairing the BSCB and/or removing the BSCB-derived injurious stimuli, we now identify that accumulation of blood-derived neurotoxic hemoglobin and iron in the spinal cord leads to early motor-neuron degeneration in SOD1(G93A) mice at least in part through iron-dependent oxidant stress. Using spontaneous or warfarin-accelerated microvascular lesions, motor-neuron dysfunction and injury were found to be proportional to the degree of BSCB disruption at early disease stages in SOD1(G93A) mice. Early treatment with an activated protein C analog restored BSCB integrity that developed from spontaneous or warfarin-accelerated microvascular lesions in SOD1(G93A) mice and eliminated neurotoxic hemoglobin and iron deposits. Restoration of BSCB integrity delayed onset of motor-neuron impairment and degeneration. Early chelation of blood-derived iron and antioxidant treatment mitigated early motor-neuronal injury. Our data suggest that BSCB breakdown contributes to early motor-neuron degeneration in ALS mice and that restoring BSCB integrity during an early disease phase retards the disease process.

KEYWORDS:

amyotrophic lateral sclerosis; neurodegeneration

PMID:
24591593
PMCID:
PMC3964055
DOI:
10.1073/pnas.1401595111
[Indexed for MEDLINE]
Free PMC Article

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