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USF and VA researchers find long-term consequences for those suffering traumatic brain injury
Date:1/4/2013

ions contributes to long-term cognitive damage post-TBI," said study co-author Dr. Paul R. Sanberg, USF senior vice president for research and innovation. "Both military and civilian patients have shown functional and cognitive deficits resulting from TBI."

Because TBI involves both acute and chronic stages, the researchers noted that animal model research on the chronic stages of TBI could provide insight into identifying therapeutic targets for treatment in the post-acute stage.

"Using animal models of TBI, our study investigated the prolonged pathological outcomes of TBI in different parts of the brain, such as the dorsal striatum, thalamus, corpus callosum white matter, hippocampus and cerebral peduncle," explained Borlongan, the study's lead author. "We found that a massive neuroinflammation after TBI causes a second wave of cell death that impairs cell proliferation and impedes the brain's regenerative capabilities."

Upon examining the rat brains eight weeks post-trauma, the researchers found "a significant up-regulation of activated microglia cells, not only in the area of direct trauma, but also in adjacent as well as distant areas." The location of inflammation correlated with the cell loss and impaired cell proliferation researchers observed.

Microglia cells act as the first and main form of immune defense in the central nervous system and make up 20 percent of the total glial cell population within the brain. They are distributed across large regions throughout the brain and spinal cord.

"Our study found that cell proliferation was significantly affected by a cascade of neuroinflammatory events in chronic TBI and we identified the susceptibility of newly formed cells within neurologic niches and suppression of neurological repair," wrote the authors.

The researchers concluded that, while the progressive deterioration of the TBI-affected brain over time suppressed efforts of repair, intervention, even
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Contact: Judy Lowry
jhlowry@usf.edu
813-974-3181
University of South Florida (USF Innovation)
Source:Eurekalert

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