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.
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.
Kim
Sang-Young
SY
Department of Biomedical Engineering, College of Medicine, The Catholic University of Korea, Seoul 137-040, South Korea.
Choi
Chi-Bong
CB
Lee
Hyun-Sung
HS
Lee
Sung-Ho
SH
Woo
Dong-Cheol
DC
Kim
Hwi-Yool
HY
Hong
Kwan-Soo
KS
Lee
Chul-Hyun
CH
Choe
Bo-Young
BY
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
D000928:Antidepressive Agents; D011522:Protons; D007294:Inositol; D003891:Desipramine