Ncubated with VECTASTAIN ABC reagent (Vector Laboratories) for 90 min and developed using 3,39-diaminobenzidine (DAB). (3) Cell quantification procedures. The sections reacted with antibody were mounted, dehydrated, and coverslipped using Permount mounting medium. We quantified the number of BrdUor Ki67-positive cells according to Trejo et al. [24]. In brief, five sections were chosen from the region, which were Title Loaded From File located from 1.28 mm to 1.68 mm posterior to the bregma, and the density of BrdU- or Ki67-positive cells in the subgranular zone (SGZ), which is a region with a diameter 2? cells thick located between the granule cell layer and the hilus of the dentate gyrus, was calculated using a Leica DM3000 microscope (Leica, Germany) with a 406 objective. The same areas and number of sections were studied for all the animals and all the experimental groups. The areas of hippocampal dentate gyrus were also measured using NIH 16574785 ImageJ software and the cell density per mm3 was calculated.8. Neurochemical AnalysisThe levels of tryptophan, 5-HT and 5-hydroxyindole acetic acid (5-HIAA) in brain were analyzed according to a modified version of the method of Zhang et al. using high-performance liquid chromatography (HPLC). [25]. In brief, 100 mg of hippocampus tissue was homogenized in 0.5 ml of 0.2 M perchloric acid (PCA) containing 100 mM EDTA?2Na and 1 mg/ml DL-isoproterenol hydrochloride. The homogenate was centrifuged at 15,000 rpm for 15 min at 4uC. The supernatant was then neutralized to pH 3.0 by adding 1 M acetate and filtered with a 0.45 mm pore membrane filter, and then 20 ml of the filtrate was injected into a high-performance liquid chromatography (HPLC) system equipped with a EICOMPACK SC-50DS (w 3.0 mm6150 mm) (EICOM, Tokyo) column. 0.1 M acetate/citrate containing 17 methanol, 190 mg/ml 1-octanesulfonic acid sodium salt, and 5 mg/EDTA?2Na (pH 3.0) was used as the mobile phase and kept at a constant flow of 0.5 ml/min. The column elute was monitored using an EPC-700 electrochemical detector (EICOM, Tokyo, Japan) and analyzed using PowerChrom EPC-500 software (EICOM, Tokyo, Japan).6. Immunohistochemistry(1). Sample collection. The day after completion of all behavioral tests, the mice were anesthetized with pentobarbital and transcardially perfused with 60 ml of saline through the left ventricle. Brains were carefully removed and divided into their two hemispheres. The left hemisphere was fixed in 4 paraformaldehyde in 0.1 M phosphate-buffered saline (PBS; 137 mM NaCl, 8.10 mM Na2HPO4, 2.68 mM KCl, 1.47 mM KH2PO4, pH7.4) overnight at room temperature. After being washed three times with PBS, the brain was cut rostro-caudally with a Leica9. Statistical AnalysisData are presented as means 6 S.E. Statistical analysis was performed using repeated measures ANOVA or factorial ANOVAExercise Prevents Depression in TD Miceas appropriate. To characterize differences between groups Title Loaded From File further, Tukey’s post hoc test was used. A value of p,0.05 was accepted as the level of significance.Results 1. Body WeightWe measured the body weight before feeding on TD diet, at the start of CUS and at weekly intervals during the CUS procedure. The time-course change of body weight during the CUS protocol is shown in Fig. 2. At the beginning of the experiment, there was no difference in body weight among the groups of mice. During the experiment, the C mice gradually increased in body weight. In contrast, the mice fed a TD diet (TD, TD+CUS, TD+CUS+ME and TD+CUS+IE.Ncubated with VECTASTAIN ABC reagent (Vector Laboratories) for 90 min and developed using 3,39-diaminobenzidine (DAB). (3) Cell quantification procedures. The sections reacted with antibody were mounted, dehydrated, and coverslipped using Permount mounting medium. We quantified the number of BrdUor Ki67-positive cells according to Trejo et al. [24]. In brief, five sections were chosen from the region, which were located from 1.28 mm to 1.68 mm posterior to the bregma, and the density of BrdU- or Ki67-positive cells in the subgranular zone (SGZ), which is a region with a diameter 2? cells thick located between the granule cell layer and the hilus of the dentate gyrus, was calculated using a Leica DM3000 microscope (Leica, Germany) with a 406 objective. The same areas and number of sections were studied for all the animals and all the experimental groups. The areas of hippocampal dentate gyrus were also measured using NIH 16574785 ImageJ software and the cell density per mm3 was calculated.8. Neurochemical AnalysisThe levels of tryptophan, 5-HT and 5-hydroxyindole acetic acid (5-HIAA) in brain were analyzed according to a modified version of the method of Zhang et al. using high-performance liquid chromatography (HPLC). [25]. In brief, 100 mg of hippocampus tissue was homogenized in 0.5 ml of 0.2 M perchloric acid (PCA) containing 100 mM EDTA?2Na and 1 mg/ml DL-isoproterenol hydrochloride. The homogenate was centrifuged at 15,000 rpm for 15 min at 4uC. The supernatant was then neutralized to pH 3.0 by adding 1 M acetate and filtered with a 0.45 mm pore membrane filter, and then 20 ml of the filtrate was injected into a high-performance liquid chromatography (HPLC) system equipped with a EICOMPACK SC-50DS (w 3.0 mm6150 mm) (EICOM, Tokyo) column. 0.1 M acetate/citrate containing 17 methanol, 190 mg/ml 1-octanesulfonic acid sodium salt, and 5 mg/EDTA?2Na (pH 3.0) was used as the mobile phase and kept at a constant flow of 0.5 ml/min. The column elute was monitored using an EPC-700 electrochemical detector (EICOM, Tokyo, Japan) and analyzed using PowerChrom EPC-500 software (EICOM, Tokyo, Japan).6. Immunohistochemistry(1). Sample collection. The day after completion of all behavioral tests, the mice were anesthetized with pentobarbital and transcardially perfused with 60 ml of saline through the left ventricle. Brains were carefully removed and divided into their two hemispheres. The left hemisphere was fixed in 4 paraformaldehyde in 0.1 M phosphate-buffered saline (PBS; 137 mM NaCl, 8.10 mM Na2HPO4, 2.68 mM KCl, 1.47 mM KH2PO4, pH7.4) overnight at room temperature. After being washed three times with PBS, the brain was cut rostro-caudally with a Leica9. Statistical AnalysisData are presented as means 6 S.E. Statistical analysis was performed using repeated measures ANOVA or factorial ANOVAExercise Prevents Depression in TD Miceas appropriate. To characterize differences between groups further, Tukey’s post hoc test was used. A value of p,0.05 was accepted as the level of significance.Results 1. Body WeightWe measured the body weight before feeding on TD diet, at the start of CUS and at weekly intervals during the CUS procedure. The time-course change of body weight during the CUS protocol is shown in Fig. 2. At the beginning of the experiment, there was no difference in body weight among the groups of mice. During the experiment, the C mice gradually increased in body weight. In contrast, the mice fed a TD diet (TD, TD+CUS, TD+CUS+ME and TD+CUS+IE.
