Abstract：
:There is a strong link between cognitive impairment and depression, but up to date it is not clear whether cognitive impairment is 'cause' or 'consequence' of depression. Therefore, we here examined the effect of cognitive impairment induced by permanent occlusion of common carotid arteries, a model known as two-vessel occlusion (2VO), on chronic unpredictable stress (CUS)-induced depression-related markers in rats. Male Sprague-Dawley rats underwent 2VO or sham surgery. Sixty days after the surgery, the cognitive function of the rats was tested using the radial arm maze task measuring working and reference memory. Subsequently, the animals were randomly assigned to undergo 21 days of CUS or to stay non-stressed. One week after the last stressor, psychomotor retardation, a feature of depression-like behavior, was assessed using the forced swim test (FST) by measuring time spent on immobility. Plasma amino acid (glutamine, glutamate and glycine) and serum pro-inflammatory cytokine (interleukin 6) levels, and hippocampus CA1 neuronal damage were measured 24h after FST exposure. Results show that 2VO increased immobility in the FST only when rats had been exposed to CUS. In addition, 2VO surgery intensified the effect of CUS on IL-6, glutamate and glycine levels and increased CA1 hippocampal damage. In conclusion, our findings show that cognitive impairment may predispose to depression by intensifying the effect of stress on depression-related behavioral, biochemical, immunological and neuronal markers.
journal_name
Brain Resjournal_title
Brain researchauthors
Khojasteh F,Nahavandi A,Mehrpouya S,Homberg JR,Mirzamohammadi S,Raufi S,Soleimani M,Barati Mdoi
10.1016/j.brainres.2014.09.056subject
Has Abstractpub_date
2015-01-30 00:00:00pages
58-68eissn
0006-8993issn
1872-6240pii
S0006-8993(14)01305-5journal_volume
1596pub_type
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