Glutathione peroxidase activity modulates recovery in the injured immature brain

Kyoko Tsuru-Aoyagi, Matthew B. Potts, Alpa Trivedi, Timothy Pfankuch, Jacob Raber, Michael Wendland, Catherine P. Claus, Seong Eun Koh, Donna Ferriero, Linda J. Noble-Haeusslein

Research output: Contribution to journalArticle

35 Scopus citations

Abstract

Objective: Mice subjected to traumatic brain injury at postnatal day 21 show emerging cognitive deficits that coincide with hippocampal neuronal loss. Here we consider glutathione peroxidase (GPx) activity as a determinant of recovery in the injured immature brain. Methods: Wild-type and transgenic (GPxTg) mice overexpressing GPx were subjected to traumatic brain injury or sham surgery at postnatal day 21. Animals were killed acutely (3 or 24 hours after injury) to assess oxidative stress and cell injury in the hippocampus or 4 months after injury after behavioral assessments. Results: In the acutely injured brains, a reduction in oxidative stress markers including nitrotyrosine was seen in the injured GPxTg group relative to wild-type control mice. In contrast, cell injury, with marked vulnerability in the dentate gyrus, was apparent despite no differences between genotypes. Magnetic resonance imaging demonstrated an emerging cortical lesion during brain maturation that was also indistinguishable between injured genotypes. Stereological analyses of cortical volumes likewise confirmed no genotypic differences between injured groups. However, behavioral tests beginning 3 months after injury demonstrated improved spatial memory learning in the GPxTg group. Moreover, stereological analysis within hippocampal subregions demonstrated a significantly greater number of neurons within the dentate of the GPx group. Interpretation: Our results implicate GPx in recovery of spatial memory after traumatic brain injury. This recovery may be attributed, in part, to a reduction in early oxidative stress and selective, long-term sparing of neurons in the dentate.

Original languageEnglish (US)
Pages (from-to)540-549
Number of pages10
JournalAnnals of Neurology
Volume65
Issue number5
DOIs
StatePublished - May 2009

ASJC Scopus subject areas

  • Neurology
  • Clinical Neurology

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    Tsuru-Aoyagi, K., Potts, M. B., Trivedi, A., Pfankuch, T., Raber, J., Wendland, M., Claus, C. P., Koh, S. E., Ferriero, D., & Noble-Haeusslein, L. J. (2009). Glutathione peroxidase activity modulates recovery in the injured immature brain. Annals of Neurology, 65(5), 540-549. https://doi.org/10.1002/ana.21600