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© The Rockefeller University Press, 0021-9525/1997//1307 $5.00
The Journal of Cell Biology, Volume 139, Number 5, , 1997 1307-1315

Article

Neurofilaments and Orthograde Transport Are Reduced in Ventral Root Axons of Transgenic Mice that Express Human SOD1 with a G93A Mutation



Bin Zhang, Pang-hsien Tu, Farhad Abtahian, John Q. Trojanowski, and Virginia M.-Y. Lee

The Center for Neurodegenerative Disease Research, Department of Pathology and Laboratory Medicine, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104

Mice engineered to express a transgene encoding a human Cu/Zn superoxide dismutase (SOD1) with a Gly93 -> Ala (G93A) mutation found in patients who succumb to familial amyotrophic lateral sclerosis (FALS) develop a rapidly progressive and fatal motor neuron disease (MND) similar to amyotrophic lateral sclerosis (ALS). Hallmark ALS lesions such as fragmentation of the Golgi apparatus and neurofilament (NF)-rich inclusions in surviving spinal cord motor neurons as well as the selective degeneration of this population of neurons were also observed in these animals. Since the mechanism whereby mutations in SOD1 lead to MND remains enigmatic, we asked whether NF inclusions in motor neurons compromise axonal transport during the onset and progression of MND in a line of mice that contained ~30% fewer copies of the transgene than the original G93A (Gurney et al., 1994). The onset of MND was delayed in these mice compared to the original G93A mice, but they developed the same neuropathologic abnormalities seen in the original G93A mice, albeit at a later time point with fewer vacuoles and more NF inclusions. Quantitative Western blot analyses showed a progressive decrease in the level of NF proteins in the L5 ventral roots of G93A mice and a concomitant reduction in axon caliber with the onset of motor weakness. By ~200 d, both fast and slow axonal transports were impaired in the ventral roots of these mice coincidental with the appearance of NF inclusions and vacuoles in the axons and perikarya of vulnerable motor neurons. This is the first demonstration of impaired axonal transport in a mouse model of ALS, and we infer that similar impairments occur in authentic ALS. Based on the temporal correlation of these impairments with the onset of motor weakness and the appearance of NF inclusions and vacuoles in vulnerable motor neurons, the latter lesions may be the proximal cause of motor neuron dysfunction and degeneration in the G93A mice and in FALS patients with SOD1 mutations.

Abbreviations used in this paper: ALS, amyotrophic lateral sclerosis; FALS, familial ALS; MND, motor neuron disease; NF, neurofilament; PD, Parkinson's disease.

Address all correspondence to Dr. Virginia M.-Y. Lee, Maloney 3, Hospital of the University of Pennsylvania, 3600 Spruce Street, Philadelphia, PA 19104-4283. Tel.: (215) 662-6427. Fax: (215) 349-5909.

We appreciate technical assistance from Mr. I.-S. Chiu and personnel from the Electron Microscopy Core Facility of the Department of Pathology and Laboratory Medicine and the Diabetes and Endocrinology Research Center at the University of Pennsylvania.


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