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Journals Brain Research Volume 1422: November

The signal transducers and activators of transcription 3 (STAT3) has been suggested to have neuroprotective roles. However, its role in ischemic preconditioning (PC) is still obscure. In this study, we examined the phosphorylation status of ser727-STAT3, which is necessary for activation of STAT3, and its roles in a rat global ischemia model with or without PC. PC was induced by 3 min of nonlethal ischemia 48 h before 5 min of lethal ischemia. Western blot analysis showed that phospho-ser727-STAT3 significantly increased from 8 to 48 h after nonlethal ischemia, while it increased only for 1 h after lethal ischemia and returned to the baseline within 24 h. In the preconditioned brains, phospho-ser727-STAT3 was induced at 1 to 4 h after lethal ischemia, and decrease of its levels delayed compared to the nonconditioned brains. Immunohistochemistry revealed that phospho-ser727-STAT3 was expressed mainly in CA1 neurons after nonlethal ischemia. Additionally, STAT3 inhibitor peptide treatment prevented PC induced-neuroprotection. These results indicate that phosphorylation of ser727-STAT3 plays an important role in PC induced- neuroptotection.

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Activation of signal transducers and activators of transcription 3 in the hippocampal CA1 region in a rat model of global cerebral ischemic preconditioning

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  • Publisher Elsevier
  • Copyright Copyright © 2011 Elsevier B.V.
  • ISSN 0006-8993
  • D.O.I. 10.1016/j.brainres.2011.08.076
  • Publisher site Get PDF  

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