High dose of simvastatin induces hyperlocomotive and anxiolytic-like activities: The association with the up-regulation of NMDA receptor binding in the rat brain

Qing Wang, Ayse Zengin, Chao Deng, Yun Li, Kelly A. Newell, Guo-Yuan Yang, Ying Lu, Einar P. Wilder-Smith, Heng Zhao, Xu-Feng Huang

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Abstract

Statins are widely being used for the treatment of a variety of conditions beyond their original indication for lowering cholesterol. We have previously reported that simvastatin affected the dopaminergic system in the rat brain. This study aims to investigate locomotor and anxiety effects along with the regional changes of N-methyl-d-aspartate (NMDA) receptors in the rat brain after 4-week administration of simvastatin. Hyperlocomotive and anxiolytic-like activities in the rat were observed after chronic administration of high dose simvastatin (10 mg/kg/day). Distributions and alterations of NMDA receptors in the post-mortem rat brain were detected by [3H] MK-801 binding autoradiography. Simvastatin increased [3H] MK-801 binding, predominantly in the prefrontal cortex (20%, p = 0.003), primary motor cortex (20%, p <0.001), cingulate cortex (28%, p <0.001), hippocampus (41%, p <0.001), caudate putamen (30%, p = 0.029), nucleus accumbens (27%, p = 0.035) and amygdala (45%, p <0.001) compared to controls. Significant positive correlations were identified between hyperlocomotive as well as anxiolytic-like activities and the upregulation of NMDA receptors in different brain regions. Our results also provide strong evidence that chronic high dose simvastatin administration is to exhibit NMDA antagonist-like effects, which would partially explain the anxiolytic and hyperlocomotor activities. These findings contribute to a better understanding of the critical roles of simvastatin in modulating psycho-neurodegenerative disorders, via NMDA receptors.

Original languageEnglish
Pages (from-to)132-138
Number of pages7
JournalExperimental Neurology
Volume216
Issue number1
DOIs
Publication statusPublished - Mar 2009
Externally publishedYes

Keywords

  • Aging
  • Alzheimer's disease
  • Anxiety
  • Locomotor activity
  • NMDA receptors
  • Parkinson's disease
  • Schizophrenia

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