Affiliation:
1. School of Medical Imaging Binzhou Medical University Yantai China
2. Department of Radiology, Chongqing University Cancer Hospital Chongqing University Chongqing China
3. Department of Clinical Laboratory Yantai Affiliated Hospital of Binzhou Medical University Yantai China
Abstract
BackgroundKetamine is a quick acting antidepressant drug, and an accurate detection method is lacking. Ketamine's effects in a rat depression model have not previously been well explored using glutamate chemical exchange saturation transfer (GluCEST).PurposeTo investigate the GluCEST changes of chronic unpredictable mild stress (CUMS) rats after receiving either ketamine or saline injection.Study TypeRandomized animal model trial.Animal Model12 CUMS and 6 Sprague–Dawley rats. Divided into three groups: ketamine (N = 6), saline (N = 6), and control (N = 6).Field Strength/Sequence7.0 T/the sequence is GluCEST and 1H MR spectroscopy (MRS).AssessmentThe CUMS rats were exposed to different stress factors for 8 weeks. The glutamate concentration in the hippocampus was assessed by the GluCEST,1H MRS, and the high‐performance liquid chromatography (HPLC).Statistical TestsThe t‐test, Mann–Whitney U test, and Pearson's correlation.ResultsIn depression conditions, GluCEST signals were lower in the bilateral hippocampus than in control group. Thirty minutes after ketamine injection, the GluCEST signals in the bilateral hippocampus were higher compared with the saline group (left: 2.99 ± 0.34 [Control] vs. 2.44 ± 0.20 [Saline] vs. 2.85 ± 0.11 [Ketamine]; right: 2.97 ± 0.28 [Control] vs. 2.49 ± 0.25 [Saline] vs. 2.86 ± 0.19 [Ketamine]). In 1H MRS, significant changes were only observed in the left hippocampus (2.00 ± 0.16 [Control] vs. 1.81 ± 0.09 [Saline] vs. 2.04 ± 0.14 [Ketamine]). Furthermore, HPLC results showed similar trends to those observed in the GluCEST results (left: 2.32 ± 0.22 [Control] vs. 1.96 ± 0.11 [Saline] vs. 2.18 ± 0.11 [Ketamine]; right: 2.35 ± 0.18 [Control] vs. 1.87 ± 0.16 [Saline] vs. 2.09 ± 0.08 [Ketamine]).Data ConclusionGluCEST can sensitively evaluate the ketamine's antidepressant effects by detecting the fast increase in glutamate concentration.Level of Evidence1Technical Efficacy Stage1
Funder
National Natural Science Foundation of China
Natural Science Foundation of Shandong Province
Subject
Radiology, Nuclear Medicine and imaging
Cited by
1 articles.
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