Brain tissue was obtained from the Douglas Bell Canada Brain Bank (DBCBQ; Douglas Mental Health Institute, Verdun, Québec). All subjects were Caucasians of French–Canadian descent, a population with a well identified founder effect105 (link). Sociodemographic and clinical information is listed in Supplementary Table 10 . Males and females were group-matched for age, pH and postmortem intervals (PMI). Other information included presence of comorbid disorders, treatment history, smoking history, history of early life adversity, cause of death and presence of drug and/or alcohol abuse (Supplementary Table 10 ). Inclusion criteria for both cases and controls were the following: the subject had to be Caucasian and of French Canadian origin and the subject had to die suddenly without prolonged agonal state. Forty-eight subjects (26 MDD: 13 males, 13 females and 22 controls [CTRLs]: 13 males, 9 females) were recruited for this study. Tissue from six brain regions—orbitofrontal cortex (OFC; BA11), dorsolateral PFC (BA8/9; dlPFC), cingulate gyrus 25 (BA25; cg25; vmPFC), anterior insula (aINS); nucleus accumbens (NAc) and ventral subiculum (vSUB)—was carefully dissected at 4°C after having been flash-frozen in isopentene at −80°C. An additional group of 32 male samples (15 MDD and 17 CTRL) from The University of Texas Southwestern Medical Center brain bank was used for the validation of male DEGs. A third cohort composed of 18 female samples (6 MDD and 12 CTRL) was used for the validation of female DEGs. Sociodemographic and clinical information for the second (males) and third (females) cohorts is listed in Supplementary Tables 11 and 12 , respectively. Tissue dissection was performed by histopathologists using reference neuroanatomical maps106 ,107 . The human study was approved by the research ethics boards of the McGill University and the University of Texas Southwestern Medical Center. Written informed consent was obtained from all participants.
Nucleus Accumbens
The Nucleus Accumbens is a critical brain region involved in reward processing, motivation, and decision-making.
It is part of the ventral striatum and plays a key role in the brain's reward circuitry.
Researchers studying the Nucleus Accumbens may investigate its involvement in addiction, mood disorders, and other neuropsychiatric conditions.
PubCompare.ai can help optimize your Nucleus Accumbens research by enabling you to easily locate and compare the latest protocols from the literature, pre-prints, and patents.
This AI-driven platform enhances reproducibility and accuracy, providing data-driven insights to drive your research forward with confidence.
Experiance the difference PubCompare.ai can make in advancing your understanding of this important brain structure.
It is part of the ventral striatum and plays a key role in the brain's reward circuitry.
Researchers studying the Nucleus Accumbens may investigate its involvement in addiction, mood disorders, and other neuropsychiatric conditions.
PubCompare.ai can help optimize your Nucleus Accumbens research by enabling you to easily locate and compare the latest protocols from the literature, pre-prints, and patents.
This AI-driven platform enhances reproducibility and accuracy, providing data-driven insights to drive your research forward with confidence.
Experiance the difference PubCompare.ai can make in advancing your understanding of this important brain structure.
Most cited protocols related to «Nucleus Accumbens»
Abuse, Alcohol
Autopsy
Brain
Caucasoid Races
Cortex, Cerebral
Dissection
Dorsolateral Prefrontal Cortex
Females
Freezing
Gyrus Cinguli
Homo sapiens
Insula of Reil
Males
Men
Mental Health
Nucleus Accumbens
Orbitofrontal Cortex
Pharmaceutical Preparations
Reproduction
Subiculum
Tissues
Acetylcysteine
Animals
Ceftriaxone
Cocaine
Decapitation
Dietary Supplements
Extinction, Psychological
Fractionation, Chemical
Glutamate
Locomotion
Nucleus Accumbens
Pharmaceutical Preparations
Proteins
Rattus norvegicus
Saline Solution
Sedatives
Self Administration
Tissue, Membrane
Tissues
Structural T1-weighted MRI brain scans were collected at the 24 participating centres. Scanning details are provided in Supplementary Table 3 . T1-weighted images from cases and controls were analysed at each site using FreeSurfer 5.3.0, for automated analysis of brain structure (Fischl, 2012 (link)). Volumetric measures were extracted for 12 subcortical grey matter regions (six left and six right, including the amygdala, caudate, nucleus accumbens, pallidum, putamen, and thalamus), the left and right hippocampi, and the left and right lateral ventricles. Cortical thickness measures were extracted for 34 left-hemispheric grey matter regions, and 34 right-hemispheric grey matter regions (68 total; Supplementary Table 4 ). Visual inspections of subcortical and cortical segmentations were conducted following standardized ENIGMA protocols (http://enigma.usc.edu ), used in prior genetic studies of brain structure (Stein et al., 2012 (link); Hibar et al., 2015 (link), 2017a (link); Adams et al., 2016 (link)), and large-scale case-control studies of neuropsychiatric illnesses (Schmaal et al., 2015 (link), 2016 (link); Hibar et al., 2016 (link); van Erp et al., 2016 (link); Boedhoe et al., 2017 ). Analysts were blind to participants’ diagnoses. Each analyst was instructed to execute a series of standardized bash scripts, identifying participants with volumetric or thickness measures greater or less than 1.5 times the interquartile range as outliers. Outlier data were then visually inspected, by overlaying the participant’s cortical segmentations on their whole-brain anatomical images. If the blinded local analyst judged any structure as inaccurately segmented, that structure was omitted from the analysis. The Supplementary material provides further information.
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Amygdaloid Body
Brain
Cortex, Cerebral
Diagnosis
Genetic Structures
Globus Pallidus
Gray Matter
MRI Scans
Nucleus Accumbens
Putamen
Seahorses
Thalamus
Ventricles, Right
Visually Impaired Persons
Adult
austin
Dopamine
Flupenthixol
Head
Histological Techniques
Males
Normal Saline
Nucleus Accumbens
Pharmaceutical Preparations
Radionuclide Imaging
Rats, Sprague-Dawley
Rattus norvegicus
Saline Solution
Adrenal Glands
Basal Ganglia
Biopharmaceuticals
BLOOD
Brodmann Area 24
Cerebellum
Cortex, Cerebral
Gene Expression
Genes, vif
Genetic Polymorphism
Genome
Genome-Wide Association Study
Genotype
Gyrus, Anterior Cingulate
Hypothalamus
Lobe, Frontal
Nucleus Accumbens
Operator, Genetic
Putamen
Seahorses
Single Nucleotide Polymorphism
Thyroid Gland
Tibial Nerve
Tissues
Most recents protocols related to «Nucleus Accumbens»
We examined the potential regulatory effects of schizophrenia-risk variants identified above on the KTN1 mRNA expression in human postmortem brains in a UK European cohort (n = 138) (i.e., BRAINEAC dataset)79 (link) and in a European-American cohort (n = 210) (i.e., GTEx dataset)80 using cis-eQTL analysis. These subjects were free of neurodegenerative and neuropsychiatric disorders. In the UK European cohort, a total of 10 brain regions were analyzed, including cerebellar, prefrontal, occipital, and temporal cortices, hippocampus, medulla, putamen, substantia nigra, thalamus, and intralobular white matter. In the European-American cohort, a total of 11 brain regions were analyzed, including BG (putamen, caudate nucleus, nucleus accumbens, and substantia nigra), limbic system [anterior cingulate gyrus (BA24), amygdala, hippocampus, and hypothalamus], prefrontal cortex (BA9), and cerebellum. Normalized mRNA expression levels were compared between different alleles of each variant using t-test. Multiple comparisons in each brain region were corrected by FDR.
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Alleles
Amygdaloid Body
Autopsy
Brain
Brodmann Area 24
Cerebellum
Europeans
Gyrus, Anterior Cingulate
Homo sapiens
Hypothalamus
KTN1 protein, human
Limbic System
Medulla Oblongata
Nucleus, Caudate
Nucleus Accumbens
Prefrontal Cortex
Putamen
RNA, Messenger
Schizophrenia
Seahorses
Substantia Nigra
Temporal Lobe
Thalamus
White Matter
The ICV in 18,713 European subjects (17 CHAGE + 29 ENIGMA2 cohorts)81 (link) and the GMVs of BG (caudate nucleus, putamen, pallidum, and nucleus accumbens) and limbic system (amygdale, hippocampus, and thalamus) in 38,258 European subjects (14 CHAGE + 35 ENIGMA2 + 1 UKBB cohorts)54 (link),82 (link) were measured by structural magnetic resonance imaging (MRI), following a standardized protocol procedure. GMVs were calculated using the brain segmentation software packages: FIRST83 (link) or FreeSurfer84 (link). All subjects were genotyped using microarray and imputed based on the 1000 Genome Project genotype panels. Genetic homogeneity was assessed in each subject using multi-dimensional scaling (MDS) analysis.
The potential regulatory effects of schizophrenia-risk variants identified above on ICV and GMVs were analyzed using multiple linear regression analysis, controlling for age, sex, 4 MDS components, ICV (for non-ICV phenotypes) and diagnosis (when applicable; most subjects were free of neurodegenerative and neuropsychiatric disorders). Multiple testing in each brain region was corrected by FDR.
The potential regulatory effects of schizophrenia-risk variants identified above on ICV and GMVs were analyzed using multiple linear regression analysis, controlling for age, sex, 4 MDS components, ICV (for non-ICV phenotypes) and diagnosis (when applicable; most subjects were free of neurodegenerative and neuropsychiatric disorders). Multiple testing in each brain region was corrected by FDR.
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Brain
Diagnosis
Europeans
Genome
Genotype
Globus Pallidus
Limbic System
Microarray Analysis
Nucleus, Caudate
Nucleus Accumbens
Phenotype
Putamen
Reproduction
Schizophrenia
Seahorses
Thalamus
Once PND90 was reached, animals were sacrificed, and tissue from the nucleus accumbens (NAcc) and dorsolateral striatum was dissected. RNA extraction was performed using the RNeasy Mini Kit (Qiagen). Libraries were prepared according to the ‘NEBNext Ultra Directional RNA Library Prep kit for Illumina’ (New England Biolabs) instructions and sequenced using a ‘NextSeq™ 500 High Output Kit’ in a 1 × 75 single read sequencing run on a NextSeq500 sequencer. Differential expression analysis was carried out using the CUFFDIFF tool. We then used Metascape (https://metascape.org/gp/index.html#/main/step1 ) to analyse the enrichment in specific gene ontologies for each comparison.
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A-A-1 antibiotic
Animals
DNA Library
Neostriatum
Nucleus Accumbens
Tissues
Structural T1 images were analyzed using FreeSurfer (version 6.0.03 ) to perform cortical modeling and volumetric segmentation. The standard processing procedures were performed separately on each cerebral hemisphere and included (1) motion correction and conform; (2) correction of signal strength non-uniformities caused by magnetic field inhomogeneities; (3) removal of no-brain issue (skull stripping); (4) affine registration to the Talairach atlas and segmentation of the subcortical white matter and deep gray matter structures. (5) tessellation of the gray-to-white and gray-to-cerebrospinal fluid surface boundaries; (6) automatic correction of topology defects; (7) surface deformation for optional placement of the gray-to-white and gray-to-CSF boundaries, two researchers blinded to the participants performed the initial visual inspection of the segmentation and minor manual corrections to the segmentation as needed; (8) smoothing with a 10 mm FWHM Gaussian smoothing kernel; (9) surface inflation and registration to a spherical atlas for intersubject matching of cortical folding patterns; (10) cortical parcellations were based on the PALS-B12 atlas (Van Essen, 2005 (link)). For each subject, per hemisphere, FreeSurfer parcellated five cortical regions (frontal, parietal, limbic, temporal, and occipital lobe) based on the PALS-B12 atlas and seven subcortical regions (nucleus accumbens, amygdala, caudate, hippocampus, pallidum, putamen, and thalamus) (Fischl et al., 2002 (link)). The regional cortical thicknesses and volumes, subcortical GM volumes, and total intracranial volume (TIV) were extracted from the reconstructed brain images in the standard brain space.
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Amygdaloid Body
Brain
Cerebral Hemispheres
Cerebrospinal Fluid
Cortex, Cerebral
Cranium
Globus Pallidus
Gray Matter
Magnetic Fields
Nucleus Accumbens
Occipital Lobe
Papillon-Lefevre Disease
Putamen
Seahorses
Thalamus
White Matter
Risk attitude was tested in female and male rats using a probabilistic decision-making task. After magazine training was completed, rats were trained on an operant fixed ratio (FR) schedule to a criterion of >23 presses out of 20 total trials where one pellet was delivered following the depression of the left or right lever. Rats then underwent auto-shaping, where the rats were required to first nose-poke the magazine tray to begin the trail where the intertrial interval was increased from 0 to 15 s, the time to perform the trail initiating the poke was decreased to 10 s, and the intertrial interval was increased to 30 s.
Detailed methods for these and the following tasks can be found in previous publications (Nasrallah et al., 2009 (link), 2011 (link); Clark et al., 2012 (link); Schindler et al., 2014 (link)). During the task, rats were presented with two levers flanking the magazine tray where one lever represented the certain lever (low-risk) and the other the uncertain lever (high-risk). The low-risk lever was associated with a certain (1.00) delivery of two sucrose pellets and the uncertain lever was associated with the probabilistic (1.00, 0.75, 0.50, 0.25, and 0.00) delivery of four sucrose pellets. Each session consisted of 24 forced trials followed by 24 free choice trials where each probability presented on a different day decreased in descending order with an intertrial interval of 45 s. During the forced choice trials and following the trial initiation, a single lever would extend and the pressing of that lever resulted in the illumination of the tray light signaling the delivery of the associated reward based on the certainty of that lever and probability of that day; whereas following trial initiation during the free choice trials, both levers were extended with a total of 10 s for that rat to choose between the two levers.
After the probabilistic decision-making was completed, female control and ethanol rats underwent anesthetized surgeries with fast-scan cyclic voltammetry to measure pedunculopontine tegmental nucleus (PPT) and medial forebrain bundle (MFB) stimulated dopamine release in the nucleus accumbens (NAcc) as follows.
Detailed methods for these and the following tasks can be found in previous publications (Nasrallah et al., 2009 (link), 2011 (link); Clark et al., 2012 (link); Schindler et al., 2014 (link)). During the task, rats were presented with two levers flanking the magazine tray where one lever represented the certain lever (low-risk) and the other the uncertain lever (high-risk). The low-risk lever was associated with a certain (1.00) delivery of two sucrose pellets and the uncertain lever was associated with the probabilistic (1.00, 0.75, 0.50, 0.25, and 0.00) delivery of four sucrose pellets. Each session consisted of 24 forced trials followed by 24 free choice trials where each probability presented on a different day decreased in descending order with an intertrial interval of 45 s. During the forced choice trials and following the trial initiation, a single lever would extend and the pressing of that lever resulted in the illumination of the tray light signaling the delivery of the associated reward based on the certainty of that lever and probability of that day; whereas following trial initiation during the free choice trials, both levers were extended with a total of 10 s for that rat to choose between the two levers.
After the probabilistic decision-making was completed, female control and ethanol rats underwent anesthetized surgeries with fast-scan cyclic voltammetry to measure pedunculopontine tegmental nucleus (PPT) and medial forebrain bundle (MFB) stimulated dopamine release in the nucleus accumbens (NAcc) as follows.
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Dopamine
Ethanol
Lighting
Males
Medial Forebrain Bundle
Nose
Nucleus Accumbens
Obstetric Delivery
Operative Surgical Procedures
Pedunculopontine Tegmental Nucleus
Pellets, Drug
Phytolacca americana
Radionuclide Imaging
Rattus
Sucrose
TNFSF10 protein, human
Woman
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More about "Nucleus Accumbens"
Nucleus Accumbens, NAc, ventral striatum, reward circuitry, addiction, mood disorders, neuropsychiatric conditions, PubCompare.ai, RNeasy Mini Kit, TRIzol, TRIzol reagent, Agilent 2100 Bioanalyzer, CM3050S, MATLAB, Stereotaxic apparatus, BASi cannula