Proteomic Identification of Oxidized Mitochondrial Proteins following Experimental Traumatic Brain Injury Export

@article{citeulike:3843095, abstract = {Experimental traumatic brain injury (TBI) results in a significant loss of cortical tissue at the site of injury, and in the ensuing hours and days a secondary injury exacerbates this primary injury, resulting in significant neurological dysfunction. The mechanism of the secondary injury is not well understood, but evidence implicates a critical role for mitochondria in this cascade. This mitochondrial dysfunction is believed to involve excitotoxicity, disruption of Ca2+ homeostasis, production of reactive oxygen species (ROS), ATP depletion, oxidative damage of mitochondrial proteins, and an overall breakdown of mitochondrial bioenergetics. Although oxidative damage occurs following TBI, the identities of proteins undergoing oxidative modification after TBI have not been investigated. In the present study, we utilized the 3-h post-injury controlled cortical impact model of experimental TBI in 20 young adult male Sprague-Dawley rats, coupled with proteomics to identify specific mitochondrial fraction proteins from the cortex and hippocampus that were oxidatively modified after TBI. We identified, from the cortex, pyruvate dehydrogenase, voltage-dependent anion channel, fumarate hydratase 1, ATP synthase, and prohibitin. From the hippocampus, we identified cytochrome C oxidase Va, isovaleryl coenzyme A dehydrogenase, enolase-1, and glyceraldehyde-3-phosphate dehydrogenase as proteins that had undergone oxidative modification following TBI. In addition, we have also shown that, following TBI, there is a reduction in the activities of pyruvate dehydrogenase (PDH), complex I, and complex IV. These findings demonstrate that, following TBI, several proteins involved in mitochondrial bioenergetics are highly oxidatively modified, which may possibly underlie the massive breakdown of mitochondrial energetics and eventual cell death known to occur in this model. The identification of these proteins provides new insights into the mechanisms that take place following TBI and may provide avenues for possible therapeutic interventions after TBI.}, author = {Opii, Wycliffe O. and Nukala, Vidya N. and Sultana, Rukhsana and Pandya, Jignesh D. and Day, Kristen M. and Merchant, Michael L. and Klein, Jon B. and Sullivan, Patrick G. and Butterfield, Allan D.}, citeulike-article-id = {3843095}, citeulike-linkout-0 = {http://dx.doi.org/10.1089/neu.2006.0229}, citeulike-linkout-1 = {http://www.liebertonline.com/doi/abs/10.1089/neu.2006.0229}, doi = {10.1089/neu.2006.0229}, journal = {Journal of Neurotrauma}, number = {5}, pages = {772--789}, posted-at = {2009-01-02 21:00:51}, priority = {2}, title = {Proteomic Identification of Oxidized Mitochondrial Proteins following Experimental Traumatic Brain Injury}, url = {http://dx.doi.org/10.1089/neu.2006.0229}, volume = {24}, year = {2007} }

TY - JOUR ID - citeulike:3843095 L3 - citeulike-article-id:3843095 N2 - Experimental traumatic brain injury (TBI) results in a significant loss of cortical tissue at the site of injury, and in the ensuing hours and days a secondary injury exacerbates this primary injury, resulting in significant neurological dysfunction. The mechanism of the secondary injury is not well understood, but evidence implicates a critical role for mitochondria in this cascade. This mitochondrial dysfunction is believed to involve excitotoxicity, disruption of Ca2+ homeostasis, production of reactive oxygen species (ROS), ATP depletion, oxidative damage of mitochondrial proteins, and an overall breakdown of mitochondrial bioenergetics. Although oxidative damage occurs following TBI, the identities of proteins undergoing oxidative modification after TBI have not been investigated. In the present study, we utilized the 3-h post-injury controlled cortical impact model of experimental TBI in 20 young adult male Sprague-Dawley rats, coupled with proteomics to identify specific mitochondrial fraction proteins from the cortex and hippocampus that were oxidatively modified after TBI. We identified, from the cortex, pyruvate dehydrogenase, voltage-dependent anion channel, fumarate hydratase 1, ATP synthase, and prohibitin. From the hippocampus, we identified cytochrome C oxidase Va, isovaleryl coenzyme A dehydrogenase, enolase-1, and glyceraldehyde-3-phosphate dehydrogenase as proteins that had undergone oxidative modification following TBI. In addition, we have also shown that, following TBI, there is a reduction in the activities of pyruvate dehydrogenase (PDH), complex I, and complex IV. These findings demonstrate that, following TBI, several proteins involved in mitochondrial bioenergetics are highly oxidatively modified, which may possibly underlie the massive breakdown of mitochondrial energetics and eventual cell death known to occur in this model. The identification of these proteins provides new insights into the mechanisms that take place following TBI and may provide avenues for possible therapeutic interventions after TBI. IS - 5 JF - Journal of Neurotrauma EP - 789 TI - Proteomic Identification of Oxidized Mitochondrial Proteins following Experimental Traumatic Brain Injury VL - 24 SP - 772 AU - Opii, Wycliffe AU - Nukala, Vidya AU - Sultana, Rukhsana AU - Pandya, Jignesh AU - Day, Kristen AU - Merchant, Michael AU - Klein, Jon AU - Sullivan, Patrick AU - Butterfield, Allan PY - 2007/// UR - http://dx.doi.org/10.1089/neu.2006.0229 ER -