scholarly journals Longitudinal in vivo Diffusion Tensor Imaging Detects Differential Microstructural Alterations in the Hippocampus of Chronic Social Defeat Stress-Susceptible and Resilient Mice

2018 ◽  
Vol 12 ◽  
Author(s):  
Xiao Liu ◽  
Jizhen Yuan ◽  
Yu Guang ◽  
Xiaoxia Wang ◽  
Zhengzhi Feng
Keyword(s):  
Diffusion Tensor Imaging ◽  
Diffusion Tensor ◽  
Social Defeat ◽  
Social Defeat Stress ◽  
Microstructural Alterations ◽  
Chronic Social Defeat Stress

scholarly journals Low-Molecular Weight BDNF Mimetic, Dimeric Dipeptide GSB-106, Reverses Depressive Symptoms in Mouse Chronic Social Defeat Stress

Biomolecules ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 252
Author(s):  
Tatiana A. Gudasheva ◽  
Anna V. Tallerova ◽  
Armen G. Mezhlumyan ◽  
Tatyana A. Antipova ◽  
Ilya O. Logvinov ◽  
...  
Keyword(s):  
Dose Range ◽  
Social Defeat ◽  
Social Defeat Stress ◽  
In Vivo Experiments ◽  
Trk Receptor ◽  
Chronic Social Defeat Stress ◽  
Swimming Test ◽  
Scientific Group

A mimetic of the BDNF loop 4, bis (N-monosuccinyl-L-seryl-L-lysine) hexamethylenediamide, named GSB-106, was designed and synthesized in our scientific group. The compound activated TrkB, MAPK/ERK, PI3K/AKT, and PLCγ in in vitro experiments. In vivo experiments with rodents revealed its antidepressant-like activity in the forced swim and the tail suspension tests at the dose range of 0.1–5.0 mg/kg (i.p., p.o.). However, GSB-106 was not studied in depression models modulating major depression in humans. In the present study, the GSB-106 antidepressant-like activity was revealed in mice at the depression model induced by 28-day social defeat stress with 21-days oral administration (0.1 mg/kg) after stress. At the same time, GSB-106 restored reduced locomotor activity and completely eliminated the anhedonia manifestations. The compound also restored reduced levels of synaptophysin and CREB in the hippocampus. In addition, the Trk receptor antagonist K252A, and the PLC inhibitor U73122, were found to completely block the antidepressant-like activity of GSB-106 in the forced swimming test in mice. Thus, the present results demonstrate the dipeptide BDNF mimetic GSB-106 reversed depressive-like behavior and restored hippocampal neuroplasticity in a rodent depression model. These effects of GSB-106 are probably regulated by TrkB signaling.

scholarly journals Upregulation of miR-195a inhibits brain-derived neurotrophic factor in mouse hippocampus and may contribute to depression-like behaviors induced by chronic social stress

2021 ◽  
Vol 19 (12) ◽  
pp. 2537-2543
Author(s):  
Xuping Wen ◽  
Mingshuan Lin
Keyword(s):  
Protein Expression ◽  
Neurotrophic Factor ◽  
Social Defeat ◽  
Brain Derived Neurotrophic Factor ◽  
Luciferase Reporter ◽  
Control Group ◽  
Social Defeat Stress ◽  
Chronic Social Defeat Stress ◽  
Mouse Hippocampus

Purpose: To explore the effect of miR-195a on nerve cells in the hippocampal region of depressionmodel mice.Methods: A chronic social defeat stress (CSDS) model was used as a depressed mouse model. In vivo, C57BL/6J mice received CSDS treatment or miR-195a antagomir. Depression-like behaviors were evaluated. In vitro, the target relationship between miR-195a and brain-derived neurotrophic factor (BDNF) was validated by luciferase reporter assays in HEK-293 cells. In primary cortical neurons, expression levels of miR-195a and BDNF mRNA were evaluated using quantitative polymerase chain reaction (qPCR). BDNF protein expression was determined by western blotting.Results: The sucrose preference ratio and social contact of the CSDS group were significantly decreased, whereas the immobility time was significantly increased, compared with the control group (p< 0.05). Interestingly, the expression of miR-195a was upregulated in the CSDS group compared with control group (p < 0.05). Bioinformatics prediction and luciferase reporter assay data indicate that miR195a bound the BDNF 3’ untranslated region. BDNF protein expression levels were significantly reduced by miR-195a mimic but increased by miR-195a inhibitor, compared with the negative control mimic group (p < 0.05). In vivo, miR-195a antagomir alleviated depression-like behaviors compared with CSDS group. In addition, miR-195a antagomir restored the expression of BDNF in mouse hippocampus in the CSDS group (p < 0.05).Conclusion: MiR-195a inhibitor ameliorates depression-like behaviors of depressed mice by downregulation of BDNF, whereas  upregulation of miR-195a inhibits BDNF expression in mouse hippocampus and may contribute to depression. Keywords: Chronic social defeat stress, Depression, MiR-195, brain-derived neurotrophic factor, BDNF 

In vivo diffusion tensor imaging of the neonatal rat brain development

2013 ◽  
Vol 44 (S 01) ◽  
Author(s):  
M Breu ◽  
D Reisinger ◽  
D Wu ◽  
Y Zhang ◽  
A Fatemi ◽  
...  
Keyword(s):  
Diffusion Tensor Imaging ◽  
Brain Development ◽  
Rat Brain ◽  
Diffusion Tensor ◽  
Neonatal Rat ◽  
Neonatal Rat Brain

scholarly journals Brain histamine and oleoylethanolamide restore behavioral deficits induced by chronic social defeat stress in mice

2021 ◽  
pp. 100317
Author(s):  
Barbara Rani ◽  
Andrea Santangelo ◽  
Adele Romano ◽  
Justyna Barbara Koczwara ◽  
Marzia Friuli ◽  
...  
Keyword(s):  
Social Defeat ◽  
Social Defeat Stress ◽  
Behavioral Deficits ◽  
Brain Histamine ◽  
Chronic Social Defeat Stress

scholarly journals Meyer’s Loop Anatomy Demonstrated Using Diffusion Tensor MR Imaging and Fiber Tractography at 3T

2014 ◽  
Vol 60 (5) ◽  
pp. 215-222 ◽  
Author(s):  
Cristina Goga ◽  
Zeynep Firat ◽  
Klara Brinzaniuc ◽  
Is Florian
Keyword(s):  
Diffusion Tensor Imaging ◽  
Diffusion Tensor ◽  
Region Of Interest ◽  
Fiber Tractography ◽  
Brain Images ◽  
3 Dimensional ◽  
Software Release ◽  
Magnetic Resonance Imaging Mri ◽  
Meyer’S Loop

Abstract Objective: The ultimate anatomy of the Meyer’s loop continues to elude us. Diffusion tensor imaging (DTI) and diffusion tensor tractography (DTT) may be able to demonstrate, in vivo, the anatomy of the complex network of white matter fibers surrounding the Meyer’s loop and the optic radiations. This study aims at exploring the anatomy of the Meyer’s loop by using DTI and fiber tractography. Methods: Ten healthy subjects underwent magnetic resonance imaging (MRI) with DTI at 3 T. Using a region-of-interest (ROI) based diffusion tensor imaging and fiber tracking software (Release 2.6, Achieva, Philips), sequential ROI were placed to reconstruct visual fibers and neighboring projection fibers involved in the formation of Meyer’s loop. The 3-dimensional (3D) reconstructed fibers were visualized by superimposition on 3-planar MRI brain images to enhance their precise anatomical localization and relationship with other anatomical structures. Results: Several projection fiber including the optic radiation, occipitopontine/parietopontine fibers and posterior thalamic peduncle participated in the formation of Meyer’s loop. Two patterns of angulation of the Meyer’s loop were found. Conclusions: DTI with DTT provides a complimentary, in vivo, method to study the details of the anatomy of the Meyer’s loop.

scholarly journals Chronic social defeat stress disrupts regulation of lipid synthesis

2010 ◽  
Vol 51 (6) ◽  
pp. 1344-1353 ◽  
Author(s):  
Jen-Chieh Chuang ◽  
Huxing Cui ◽  
Brittany L. Mason ◽  
Melissa Mahgoub ◽  
Angie L. Bookout ◽  
...  
Keyword(s):  
Lipid Synthesis ◽  
Social Defeat ◽  
Social Defeat Stress ◽  
Chronic Social Defeat Stress
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