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American Journal of Pathology, Vol 145, 1271-1279, Copyright © 1994 by American Society for Investigative Pathology

REGULAR ARTICLES

Development of central nervous system pathology in a murine transgenic model of human amyotrophic lateral sclerosis

MC Dal Canto and ME Gurney
Department of Pathology (Neuropathology), Northwestern University Medical School, Chicago, Illinois 60611.

Transgenic mice expressing mutant Cu,Zn superoxide dismutase (SOD), containing a substitution of glycine at position 93 by alanine, develop disease prevalently affecting motor neurons. Light microscopical and ultrastructural studies reveal that the earliest pathological features are microvesiculation of large neurons of the anterior horns of the spinal cord. These vacuoles originate from dilation of rough endoplasmic reticulum and from degenerating mitochondria. At the end stage of the disease, the microvesicular pattern gives way to atrophic anterior horns showing severe neuronal depletion and hyaline, filamentous inclusions in some of the surviving neurons. Posterior horn neurons and dorsal root ganglia are not affected. With disease progression, moderate degeneration of anterior and lateral columns, severe degeneration of anterior roots, and mild degeneration in posterior columns and roots become apparent. This study shows that a mutation in SOD, known to occur in a percentage of familial amyotrophic lateral sclerosis patients, may affect only selective neuronal populations, although SOD is a ubiquitous enzyme.


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Copyright © 1994 by the American Society for Investigative Pathology.