Involvement of Extracellular Signal Regulated Kinases in Traumatic Brain Injury-Induced Depression in Rodents

被引:34
作者
Kuo, Jinn-Rung [1 ,2 ]
Cheng, Yi-Hsuan [3 ]
Chen, Yi-Shion [3 ]
Chio, Chung-Ching [1 ]
Gean, Po-Wu [3 ]
机构
[1] Taiwan Univ Sci & Technol, Chi Mei Med Ctr, Dept Neurosurg, Tainan, Taiwan
[2] Taiwan Univ Sci & Technol, Dept Biotechnol, Tainan, Taiwan
[3] Natl Cheng Kung Univ, Coll Med, Dept Pharmacol, Tainan 70101, Taiwan
关键词
antidepressant; depression; extracellular signal regulated kinases (ERK); hippocampus; traumatic brain injury; MAP KINASE; FLUOXETINE; DISORDER; BEHAVIOR; MODEL; RATES;
D O I
10.1089/neu.2012.2689
中图分类号
R4 [临床医学];
学科分类号
1002 ; 100602 ;
摘要
Traumatic brain injury (TBI) is the most common cause of death and acquired disability among children and young adults in the developed countries. In clinical studies, the incidence of depression is high after TBI, and the mechanisms behind TBI-induced depression remain unclear. In the present study, we subjected rats to a moderate fluid percussion into the closed cranial cavity to induce TBI. After 3 days of recovery, injured rats were given a forced swim test (FST) and novelty-suppressed feeding tests. We found that TBI rats exhibited increased duration of immobility and longer latency to begin chewing food in a new environment compared with sham-operated rats. Western blot analysis showed that TBI led to a decrease in the phosphorylated levels of extracellular signal regulated kinases (ERK1/2) and p38 mitogen-activated protein kinase (p38 MAPK). Fluoxetine, a selective serotonin reuptake inhibitor (SSRI), significantly reduced the duration of immobility when administered once per day for 14 days. Consistent with behavioral tests, fluoxetine treatment reversed TBI-induced decrease in p-ERK1/2 and p-p38 MAPK levels. Pre-treatment with a selective tryptophan hydroxylase inhibitor para-chlorophenylalanine (PCPA) blocked the antidepressant effect of fluoxetine. PCPA also prevented the effect of fluoxetine on ERK1/2 phosphorylation without affecting p38 MAPK phosphorylation. Pre-treatment with ERK inhibitor SL327 but not p38 MAPK inhibitor SB203580 prevented the antidepressant effect of fluoxetine. These results suggest that ERK1/2 plays a critical role in TBI-induced depression.
引用
收藏
页码:1223 / 1231
页数:9
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