Welcome to Chinese Journal of Clinical Pharmacology and Therapeutics,Today is Chinese

Chinese Journal of Clinical Pharmacology and Therapeutics ›› 2018, Vol. 23 ›› Issue (7): 734-742.doi: 10.12092/j.issn.1009-2501.2018.07.003

Previous Articles     Next Articles

Involvement of lateral septum GABAA receptors in the regulation of anxiety-like behaviors in hemiparkinsonian rats

CHANG Yongli1, WANG Chunlei2, YUAN Li1, GUO Xiaoshu1, HAN Lingna1   

  1. 1 Department of Physiology, 2 Department of Biomedical Engineering, Changzhi Medical College, Changzhi 046000, Shanxi, China
  • Received:2018-03-08 Revised:2018-04-07 Online:2018-07-26 Published:2018-07-20

Abstract:

AIM: To investigate the role of GABAA receptors in the lateral septum (LS) in the regulation of anxiety-like behaviors in hemiparkinsonian rats. METHODS: A total of 167 rats were randomly divided into sham-operated group (n=85) and medial forebrain bundle (MFB) lesioned group (n=82). The open field and elevated plus maze (EPM) test were performed to study the influence of MFB lesion and intra-LS injection of GABAA agonist muscimol (0.2, 0.4 or 0.8 μg/rat) and antagonist picrotoxin (0.1, 0.2 or 0.4 μg/rat) on anxiety-like behaviors. Changes of monoamine levels in limbic related brain regions were observed by high performance liquid chromatography with electrochemical detection. RESULTS: Compared with sham-operated group, the MFB lesioned group induced anxiety-like behaviors. The dopamine (DA) levels in LS, amygdala and ventral hippocampus (vHip) were significantly decreased compared with sham-opreated group. Compared with the rats treated with vehicle in the same group, the intra-injection of muscimol in LS induced or aggravated the anxiety-like behaviors in two groups, and decreased DA and 5-hydroxytryptamine (5-HT) levels in three brain regions. In contrast, the administration of picrotoxin improved anxiety-like behaviors, and increased 5-HT in three brain regions and DA in amygdala and vHip. However, the doses producing the behavioral effects in the lesioned rats were higher than those in sham-operated rats. CONCLUSION: GABAA receptors in the LS are involved in the regulation of anxiety-like behaveiors, which is attributable to changes in dopamine, 5-HT levels in the limbic-related brain regions after activation and blockade of GABAA receptors.

Key words: lateral septum, GABAA receptors, anxiety, Parkinson's disease

CLC Number: