title: Reversal of myo-inositol metabolic level in the left dorsolateral prefrontal cortex of rats exposed to forced swimming test following desipramine treatment: an in vivo localized (1)H-MRS study at 4.7 T.
abstract: The forced swimming test (FST) is a useful paradigm that is relatively quick and simple to perform and has been utilized to predict antidepressant activity based on learned helplessness as a model of depression. To date, few studies have used proton magnetic resonance spectroscopy ((1)H-MRS) to assess antidepressant effects in rats. The purpose of this study was to assess desipramine (DMI) effects on the left dorsolateral prefrontal cortex (DLPFC) of the rats, which were randomly assigned to three groups (control, n=10; FST+saline, n=10; FST+DMI, n=10), using single-voxel localization technique. All (1)H-MRS experiments were performed on a Bruker 4.7-T scanner with 400 mm bore magnet, allowing for acquisition of in vivo (1)H point-resolved spectroscopy spectra (TR/TE=3000/30 ms, number of data points=2048, NEX=512, voxel volume=27 μl, scan time=25 min). Proton metabolites were quantified automatically using LCModel software and were expressed as ratios to total creatine (Cr+PCr). Major target metabolites such as N-acetyl aspartate (NAA)+N-acetylaspartylglutamate (NAAG), glutamate+glutamine (Glu+Gln), glycerophosphorylcholine+phosphorylcholine (GPC+PCho), myo-inositol (mIns) and taurine (Tau) were successfully quantified with Cramer-Rao lower boundary ≤10%. There were significantly higher mIns/(Cr+PCr) and mIns/(NAA+NAAG) ratios in the FST+saline group compared to the control group. In the FST+DMI group, both mIns/(Cr+PCr) and mIns/(NAA+NAAG) ratios were significantly decreased to the level similar to those in the control group. No other metabolite ratios were significantly different among the three groups. Our findings suggest a possible role of altered mIns level within the left DLPFC of the rat model for depression.
authors.affiliation: Department of Biomedical Engineering, College of Medicine, The Catholic University of Korea, Seoul 137-040, South Korea.
authors.forename: Sang-Young
authors.initials: SY
authors.lastname: Kim
authors.forename: Chi-Bong
authors.initials: CB
authors.lastname: Choi
authors.forename: Hyun-Sung
authors.initials: HS
authors.lastname: Lee
authors.forename: Sung-Ho
authors.initials: SH
authors.lastname: Lee
authors.forename: Dong-Cheol
authors.initials: DC
authors.lastname: Woo
authors.forename: Hwi-Yool
authors.initials: HY
authors.lastname: Kim
authors.forename: Kwan-Soo
authors.initials: KS
authors.lastname: Hong
authors.forename: Chul-Hyun
authors.initials: CH
authors.lastname: Lee
authors.forename: Bo-Young
authors.initials: BY
authors.lastname: Choe
mesh_terms: D000818:Animals; D000928:Antidepressive Agents / Q000008:administration & dosage; D001522:Behavior, Animal / Q000187:drug effects / Q000502:physiology; D003891:Desipramine / Q000008:administration & dosage*; D007294:Inositol / Q000378:metabolism*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008297:Male; D008657:Metabolic Clearance Rate; D017397:Prefrontal Cortex / Q000187:drug effects* / Q000378:metabolism*; D011522:Protons; D051381:Rats; D017207:Rats, Sprague-Dawley; D013550:Swimming / Q000502:physiology*; D014018:Tissue Distribution
chemical_list: D000928:Antidepressive Agents; D011522:Protons; D007294:Inositol; D003891:Desipramine