期刊
STRESS-THE INTERNATIONAL JOURNAL ON THE BIOLOGY OF STRESS
卷 18, 期 1, 页码 96-106出版社
TAYLOR & FRANCIS LTD
DOI: 10.3109/10253890.2014.995085
关键词
Cognition; glutamate receptor; hippocampus; long-term potentiation; microglia; stress
资金
- National Key Technology RD Program [2009BAI85B04]
- National Basic Research Program of China (973 Program) [2012CB525002]
- National Natural Science Foundation of China [81172621, 30901173]
- Program for New Century Excellent Talents in University
- Science and Technology Innovation Projects of Shaanxi Province [2011KTCL03-19]
- Program for Changjiang Scholars and Innovative Research Team in University (PCSIRT)
- Program of Public Welfare, Ministry of Health, China [200902006]
Chronic stress is considered to be a major risk factor in the development of psychopathological syndromes in humans. Cognitive impairments and long-term potentiation (LTP) impairments are increasingly recognized as major components of depression, anxiety disorders and other stress-related chronic psychological illnesses. It seems timely to systematically study the potentially underlying neurobiological mechanisms of altered cognitive and synaptic plasticity in the course of chronic stress. In the present study, a rat model of chronic unpredictable stress (CUS) induced a cognitive impairment in spatial memory in the Morris water maze (MWM) test and a hippocampal LTP impairment. CUS also induced hippocampal microglial activation and attenuated phosphorylation of glutamate receptor 1 (GluR1 or GluA1). Moreover, chronic treatment with the selective microglial activation blocker, minocycline (120 mg/kg per day), beginning 3 d before CUS treatment and continuing through the behavioral testing period, prevented the CUS-induced impairments of spatial memory and LTP induction. Additional studies showed that minocycline-induced inhibition of microglia activation was associated with increased phosphorylation of GluR1. These results suggest that hippocampal microglial activation modulates the level of GluR1 phosphorylation and might play a causal role in CUS-induced cognitive and LTP disturbances.
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