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Journal of Molecular Neuroscience

, Volume 54, Issue 4, pp 591–601 | Cite as

Simvastatin Pretreatment Protects Cerebrum from Neuronal Injury by Decreasing the Expressions of Phosphor-CaMK II and AQP4 in Ischemic Stroke Rats

  • Min-xia ZhuEmail author
  • Chao Lu
  • Chun-mei Xia
  • Zhong-wei Qiao
  • Da-nian Zhu
Article

Abstract

Excitotoxicity and cytotoxic edema are the two major factors resulting in neuronal injury during brain ischemia and reperfusion. Ca2+/calmodulin-dependent protein kinase II (CaMK II), the downstream signal molecular of N-methyl-d-aspartate receptors (NMDARs), is a mediator in the excitotoxicity. Aquaporin 4 (AQP4), expressed mainly in the brain, is an important aquaporin to control the flux of water. In a previous study, we had reported that pretreatment of simvastatin protected the cerebrum from ischemia and reperfusion injury by decreasing neurological deficit score and infarct area (Zhu et al. PLoS One 7:e51552, 2012). The present study used a middle cerebral artery occlusion (MCAO) model to further explore the pleiotropic effect of simvastatin via CaMK II and AQP4. The results showed that simvastatin reduced degenerated cells and brain edema while decreasing the protein expressions of phosphor-CaMK II and AQP4, and increasing the ratios of Bcl-2/Bax, which was independent of cholesterol-lowering effect. Immunocomplexes formed between the subunit of NMDARs-NR3A and AQP4 were detected for the first time. It was concluded that simvastatin could protect the cerebrum from neuronal excitotoxicity and cytotoxic edema by downregulating the expressions of phosphor-CaMK II and AQP4, and that the interaction between NR3A and AQP4 might provide the base for AQP4 involving in the signaling pathways mediated by NMDARs.

Keywords

Ca2+/calmodulin-dependent protein kinase II Aquaporin 4 Simvastatin Excitotoxicity Cytotoxic edema NR3A 

Abbreviations

AQP

Aquaporin

BWC

Brain water content

CaMK II

Ca2+/calmodulin-dependent protein kinase II

MCAO

Middle cerebral artery occlusion

NMDARs

N-methyl-d-aspartate receptors

Ser

Serine

Sim

Simvastatin

T2WI

T2-weighted imaging

Thr

Threonine

Notes

Acknowledgments

This work was supported by grant from the Second Major Projects of Science and Technology Department in Tibet Autonomous Region.

Conflict of Interest

The authors declare that they have no conflict of interest.

Open Access

This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Min-xia Zhu
    • 1
    • 2
    Email author
  • Chao Lu
    • 2
  • Chun-mei Xia
    • 2
  • Zhong-wei Qiao
    • 3
  • Da-nian Zhu
    • 2
  1. 1.Medical College of Tibet University for NationalitiesXianyangChina
  2. 2.Department of Physiology and Pathophysiology, School of Basic Medical SciencesFudan UniversityShanghaiChina
  3. 3.Department of Radiology, Children’s HospitalFudan UniversityShanghaiChina

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