A decreased level of the hippocampal choline signal was found in patients with depression in previous proton magnetic resonance spectroscopy ((1)H-MRS) studies. The objective of this study is to compare choline levels before and after the forced swimming test (FST), an animal model of depression typically used for assessing antidepressant activity. (1)H-MRS spectra were obtained from both the left and right hippocampus. After the FST, rats showed a significant decrease of the choline/creatine (Cho/Cr, p = 0.037) and choline/N-acetylaspartate (Cho/NAA, p = 0.048) ratios in the left hippocampus, but not in the right hippocampus. This finding was analogous to results from patients with depression. It suggests that decreased Cho/Cr and Cho/NAA ratios in the left hippocampal regions might be considered to be biomarkers in rats with depression.
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