Citation

Alkaslasi MR, Cho NE, Dhillon NK, Shelest O, Haro-Lopez PS, Linaval NT, Ghoulian J, Yang AR, Vit JP, Avalos P, Ley EJ, Thomsen GM. Brain Sci. 2021; 11(2): e0160.

Copyright

(Copyright © 2021, Switzerland Molecular Diversity Preservation International (MDPI) AG)

DOI

10.3390/brainsci11020160

PMID

unavailable

Abstract

Traumatic brain injury (TBI) is a well-established risk factor for several neurodegenerative disorders including Alzheimer's disease and Parkinson's disease, however, a link between TBI and amyotrophic lateral sclerosis (ALS) has not been clearly elucidated. Using the SOD1(G93A) rat model known to recapitulate the human ALS condition, we found that exposure to mild, repetitive TBI lead ALS rats to experience earlier disease onset and shortened survival relative to their sham counterparts. Importantly, increased severity of early injury symptoms prior to the onset of ALS disease symptoms was linked to poor health of corticospinal motor neurons and predicted worsened outcome later in life. Whereas ALS rats with only mild behavioral injury deficits exhibited no observable changes in corticospinal motor neuron health and did not present with early onset or shortened survival, those with more severe injury-related deficits exhibited alterations in corticospinal motor neuron health and presented with significantly earlier onset and shortened lifespan. While these studies do not imply that TBI causes ALS, we provide experimental evidence that head injury is a risk factor for earlier disease onset in a genetically predisposed ALS population and is associated with poor health of corticospinal motor neurons.

Language: en

Keywords

traumatic brain injury; concussion; chronic traumatic encephalopathy; amyotrophic lateral sclerosis; corticospinal motor neurons