Sulfiredoxin-1 exerts anti-apoptotic and neuroprotective effects against oxidative stress-induced injury in rat cortical astrocytes following exposure to oxygen-glucose deprivation and hydrogen peroxide

Zhou,Yunchuan; Zhou,Yang; Yu,Shanshan; Wu,Jingxian; Chen,Yanlin; Zhao,Yong

doi:10.3892/ijmm.2015.2205

July-2015 Volume 36 Issue 1

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July-2015 Volume 36 Issue 1

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Sulfiredoxin-1 exerts anti-apoptotic and neuroprotective effects against oxidative stress-induced injury in rat cortical astrocytes following exposure to oxygen-glucose deprivation and hydrogen peroxide

Authors:
- Yunchuan Zhou
- Yang Zhou
- Shanshan Yu
- Jingxian Wu
- Yanlin Chen
- Yong Zhao
View Affiliations / Copyright

Affiliations: Department of Pathology, Chongqing Medical University, Chongqing 400016, P.R. China

Copyright: © Zhou et al. This is an open access article distributed under the terms of Creative Commons Attribution License [CC BY_NC 3.0].
Pages: 43-52
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Published online on: May 8, 2015

https://doi.org/10.3892/ijmm.2015.2205
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Abstract

Sulfiredoxin 1 (Srxn1), an endogenous antioxidant protein, plays an important neuroprotective role in cerebral ischemia. However, the exact mechanisms of action of Srxn1 in cerebral ischemia have not yet been fully elucidated. Therefore, in the present study, rat primary cortical astrocytes transfected with a lentiviral vector encoding short hairpin RNA (shRNA) were exposed to oxygen-glucose deprivation (OGD) for 4 h or to 100 µM hydrogen peroxide (H2O2) for 6 h, in order to construct an in vitro model of cerebral ischemia-induced damage. We found that following exposure to OGD or H2O2, the knockdown of Srxn1 resulted in a decrease in cell viability, as shown by MTS assay, an increase in cell damage, as shown by lactate dehydrogenase assay and an increase in cellular apoptosis, as shown by Hoechst 33342 staining and flow cytometry. Furthermore, we found that following exposure to OGD or H2O2, the knockdown of Srxn1 resulted in a decrease in mitochondrial transmembrane potential (Δψm) as indicated by JC-1 staining, an increase in the cytoplasmic expression of cytochrome c (Cyt.C), caspase-3, caspase-9, poly(ADP-ribose) polymerase (PARP) and Bax protein at the protein level, but a decrease in the expression of the anti-apoptotic Bcl-2 protein; these effects were tightly associated with the mitochondrial apoptotic pathway. However, we found that there was no obvious change in the intracellular calcium ([Ca2+]i) levels and caspase-12 expression following the knockdown of Srxn1. Taken together, the results from the present study demonstrate that Srxn1 protects primary rat cortical astrocytes from OGD- or H2O2-induced apoptosis and that involves the activation of the mitochondrial apoptotic pathway, which suggests that Srxn1 may be a potential target in the treatment of cerebral ischemia.

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Journals

International Journal of Molecular Medicine

International Journal of Oncology

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International Journal of Epigenetics

Medicine International

Sulfiredoxin-1 exerts anti-apoptotic and neuroprotective effects against oxidative stress-induced injury in rat cortical astrocytes following exposure to oxygen-glucose deprivation and hydrogen peroxide

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