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01-03-2015 | Original Paper

The Neuroprotective Effect of Salubrinal in a Mouse Model of Traumatic Brain Injury

Authors: Vardit Rubovitch, Shani Barak, Lital Rachmany, Renana Baratz Goldstein, Yael Zilberstein, Chaim G. Pick

Published in: NeuroMolecular Medicine | Issue 1/2015

Abstract

We have previously reported that mild traumatic brain injury (mTBI) induced cognitive deficits as well as apoptotic changes in the brains of mice. Apoptosis may be caused by severe, prolonged accumulation of misfolded proteins, and protein aggregation in the endoplasmic reticulum (ER stress). In an additional study, we have reported that mTBI activated the pro-apoptotic arm of the integrated stress response (ISR). The main goal of the present study was to test the involvement of the adaptive eIF2α/ATF4 pathway in mTBI-affected brains. Head injury was induced with a noninvasive, closed-head weight drop (30 g) to ICR mice. Salubrinal, the selective phosphatase inhibitor of p-eIF2α, was injected immediately and 24 h after mTBI (1 mg/kg, ip). Y-maze and novel object recognition tests to assess spatial and visual memories, respectively, were conducted either 7 or 30 days post-trauma. Salubrinal administration significantly improved memory deficits following mTBI. Slaubrinal also prevented the elevation of degenerating neurons and the reduction of mature neurons in the cortex (as seen by immunofluorescent staining with Fluoro-Jade-B and NeuN antibodies, 72 h and 1 week post-mTBI, respectively). Western blot analysis revealed that salubrinal prevented the significant reduction in eIF2α and ATF4 phosphorylation in mTBI brains 72 h post-injury. Immunofluorescence staining revealed that although the reduction in p-eIF2α did not reach significance, salubrinal administration elevated it dramatically. Our results show that targeting the translational/adaptive arm of the ISR with salubrinal may serve as a therapeutic strategy for brain damage.

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Title: The Neuroprotective Effect of Salubrinal in a Mouse Model of Traumatic Brain Injury
Authors: Vardit Rubovitch
Shani Barak
Lital Rachmany
Renana Baratz Goldstein
Yael Zilberstein
Chaim G. Pick
Publication date: 01-03-2015
Publisher: Springer US
Published in: NeuroMolecular Medicine / Issue 1/2015
Print ISSN: 1535-1084
Electronic ISSN: 1559-1174
DOI: https://doi.org/10.1007/s12017-015-8340-3

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The Neuroprotective Effect of Salubrinal in a Mouse Model of Traumatic Brain Injury

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