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Cytochrome c release and caspase activation after traumatic brain injury

Sullivan, Patrick G, Keller, Jeffrey N, Bussen, Wendy L, Scheff, Stephen W·2002·Brain Research
DOI 10.1016/s0006-8993(02)02968-2
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Abstract

Experimental traumatic brain injury (TBI) results in a rapid and significant necrosis of cortical tissue at the site of injury. In the ensuing hours and days, secondary injury exacerbates the primary damage resulting in significant neurological dysfunction. The identification of cell death pathways that mediate this secondary traumatic injury have not been elucidated, however recent studies have implicated a role for apoptosis in the neuropathology of traumatic brain injury. The present study utilized a controlled cortical impact model of brain injury to assess the involvement of apoptotic pathways: release of cytochrome c from mitochondria and the activation of caspase-1- and caspase-3-like proteases in the injured cortex at 6, 12 and 24 h post-injury. Collectively, these results demonstrate cytochrome c release from mitochondria and its redistribution into the cytosol occurs in a time-dependent manner following TBI. The release of cytochrome c is accompanied by a time-dependent increase in caspase-3-like protease activity with no apparent increase in caspase-1-like activity. However, pretreatment with a general caspase inhibitor had no significant effect on the amount of cortical damage observed at 7 days post-injury. Our data suggest that several pro-apoptotic events occur following TBI, however the translocation of cytochrome c itself and/or other events upstream of caspase activation/inhibition may be sufficient to induce neuronal cell death.

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Metadata

Authors
Sullivan, P. G., Keller, J. N., Bussen, W. L., & Scheff, S. W.
Venue
Brain Research
Publisher
Elsevier BV
Published
2002-09
Volume
949
Issue
1-2
Pages
88-96
ISSN
0006-8993
DOI
10.1016/s0006-8993(02)02968-2
Cited by
129
References
1
Language
en
Licence
www.elsevier.com/tdm/userlicense/1.0/ (tdm)

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