JOAO RICARDO SATO

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Projetos de Pesquisa
Unidades Organizacionais
LIM/44 - Laboratório de Ressonância Magnética em Neurorradiologia, Hospital das Clínicas, Faculdade de Medicina

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Agora exibindo 1 - 6 de 6
  • article 16 Citação(ões) na Scopus
    An integrative approach to investigate the respective roles of single-nucleotide variants and copy-number variants in Attention-Deficit/Hyperactivity Disorder
    (2016) LIMA, Leandro de Araujo; FEIO-DOS-SANTOS, Ana Cecilia; BELANGERO, Sintia Iole; GADELHA, Ary; BRESSAN, Rodrigo Affonseca; SALUM, Giovanni Abrahao; PAN, Pedro Mario; MORIYAMA, Tais Silveira; GRAEFF-MARTINS, Ana Soledade; TAMANAHA, Ana Carina; ALVARENGA, Pedro; KRIEGER, Fernanda Valle; FLEITLICH-BILYK, Bacy; JACKOWSKI, Andrea Parolin; BRIETZKE, Elisa; SATO, Joao Ricardo; POLANCZYK, Guilherme Vanoni; MARI, Jair de Jesus; MANFRO, Gisele Gus; ROSARIO, Maria Conceicao do; MIGUEL, Euripedes Constantino; PUGA, Renato David; TAHIRA, Ana Carolina; SOUZA, Viviane Neri; CHILE, Thais; GOUVEIA, Gisele Rodrigues; SIMOES, Sergio Nery; CHANG, Xiao; PELLEGRINO, Renata; TIAN, Lifeng; GLESSNER, Joseph T.; HASHIMOTO, Ronaldo Fumio; ROHDE, Luis Augusto; SLEIMAN, Patrick M. A.; HAKONARSON, Hakon; BRENTANI, Helena
    Many studies have attempted to investigate the genetic susceptibility of Attention-Deficit/Hyperactivity Disorder (ADHD), but without much success. The present study aimed to analyze both single-nucleotide and copy-number variants contributing to the genetic architecture of ADHD. We generated exome data from 30 Brazilian trios with sporadic ADHD. We also analyzed a Brazilian sample of 503 children/adolescent controls from a High Risk Cohort Study for the Development of Childhood Psychiatric Disorders, and also previously published results of five CNV studies and one GWAS meta-analysis of ADHD involving children/adolescents. The results from the Brazilian trios showed that cases with de novo SNVs tend not to have de novo CNVs and vice-versa. Although the sample size is small, we could also see that various comorbidities are more frequent in cases with only inherited variants. Moreover, using only genes expressed in brain, we constructed two ""in silico"" protein-protein interaction networks, one with genes from any analysis, and other with genes with hits in two analyses. Topological and functional analyses of genes in this network uncovered genes related to synapse, cell adhesion, glutamatergic and serotoninergic pathways, both confirming findings of previous studies and capturing new genes and genetic variants in these pathways.
  • article 88 Citação(ões) na Scopus
    Stroke lesion in cortical neural circuits and post-stroke incidence of major depressive episode: A 4-month prospective study
    (2011) TERRONI, Luisa; AMARO JR., Edson; IOSIFESCU, Dan V.; TINONE, Gisela; SATO, Joao Ricardo; LEITE, Claudia Costa; SOBREIRO, Matildes F. M.; LUCIA, Mara Cristina Souza; SCAFF, Milberto; FRAGUAS, Renerio
    Objective. Little is known about the relevance of lesion in neural circuits reported to be associated with major depressive disorder. We investigated the association between lesion stroke size in the limbic-cortical-striatal-pallidal-thalamic (LCSPT) circuit and incidence of major depressive episode (MDE). Methods. We enrolled 68 patients with first-ever ischemic stroke and no history of major depressive disorder. Neurological and psychiatric examinations were performed at three time-points. We diagnosed major depressive episode, following DSM-IV criteria. Lesion location and volume were determined with magnetic resonance imaging, using a semi-automated method based on the Brodmann Cytoarchitectonic Atlas. Results. Twenty-one patients (31%) experienced major depressive episode. Larger lesions in the left cortical regions of the LCSPT circuit (3,760 vs. 660 mm(3); P = 0.004) were associated with higher incidence of MDE. Secondary analyses revealed that major depressive episode was associated with larger lesions in areas of the medial prefrontal cortex including the ventral (BA24) and dorsal anterior cingulate cortex (BA32) and subgenual cortex (BA25); and also the subiculum (BA28/36) and amygdala (BA34). Conclusions Our findings indicate that depression due to stroke is aetiologically related to the disruption of the left LCSPT circuit and support the relevance of the medial prefrontal cortex dysfunction in the pathophysiology of depression.
  • article 22 Citação(ões) na Scopus
    Temporal Stability of Network Centrality in Control and Default Mode Networks: Specific Associations with Externalizing Psychopathology in Children and Adolescents
    (2015) SATO, Joao Ricardo; BIAZOLI JR., Claudinei Eduardo; SALUM, Giovanni Abrahao; GADELHA, Ary; CROSSLEY, Nicolas; SATTERTHWAITE, Theodore D.; VIEIRA, Gilson; ZUGMAN, Andre; PICON, Felipe Almeida; PAN, Pedro Mario; HOEXTER, Marcelo Queiroz; ANES, Mauricio; MOURA, Luciana Monteiro; DEL'AQUILLA, Marco Antonio Gomes; AMARO JR., Edson; MCGUIRE, Philip; LACERDA, Acioly L. T.; ROHDE, Luis Augusto; MIGUEL, Euripedes Constantino; JACKOWSKI, Andrea Parolin; BRESSAN, Rodrigo Affonseca
    Abnormal connectivity patterns have frequently been reported as involved in pathological mental states. However, most studies focus on ""static,"" stationary patterns of connectivity, which may miss crucial biological information. Recent methodological advances have allowed the investigation of dynamic functional connectivity patterns that describe non-stationary properties of brain networks. Here, we introduce a novel graphical measure of dynamic connectivity, called time-varying eigenvector centrality (tv-EVC). In a sample 655 children and adolescents (7-15 years old) from the Brazilian ""High Risk Cohort Study for Psychiatric Disorders"" who were imaged using resting-state fMRI, we used this measure to investigate age effects in the temporal in control and default-mode networks (CN/DMN). Using support vector regression, we propose a network maturation index based on the temporal stability of tv-EVC. Moreover, we investigated whether the network maturation is associated with the overall presence of behavioral and emotional problems with the Child Behavior Checklist. As hypothesized, we found that the tv-EVC at each node of CN/DMN become more stable with increasing age (P < 0.001 for all nodes). In addition, the maturity index for this particular network is indeed associated with general psychopathology in children assessed by the total score of Child Behavior Checklist (P = 0.027). Moreover, immaturity of the network was mainly correlated with externalizing behavior dimensions. Taken together, these results suggest that changes in functional network dynamics during neurodevelopment may provide unique insights regarding pathophysiology. (C) 2015 Wiley Periodicals, Inc.
  • article 24 Citação(ões) na Scopus
    White matter microstructure and its relation to clinical features of obsessive-compulsive disorder: findings from the ENIGMA OCD Working Group
    (2021) PIRAS, Fabrizio; PIRAS, Federica; ABE, Yoshinari; AGARWAL, Sri Mahavir; ANTICEVIC, Alan; AMEIS, Stephanie; ARNOLD, Paul; BANAJ, Nerisa; BARGALLO, Nuria; BATISTUZZO, Marcelo C.; BENEDETTI, Francesco; BEUCKE, Jan-Carl; BOEDHOE, Premika S. W.; BOLLETTINI, Irene; BREM, Silvia; CALVO, Anna; CHO, Kang Ik Kevin; CIULLO, Valentina; DALLASPEZIA, Sara; DICKIE, Erin; ELY, Benjamin Adam; FAN, Siyan; FOUCHE, Jean-Paul; GRUNER, Patricia; GUERSEL, Deniz A.; HAUSER, Tobias; HIRANO, Yoshiyuki; HOEXTER, Marcelo Q.; IORIO, Mariangela; JAMES, Anthony; REDDY, Y. C. Janardhan; KAUFMANN, Christian; KOCH, Kathrin; KOCHUNOV, Peter; KWON, Jun Soo; LAZARO, Luisa; LOCHNER, Christine; MARSH, Rachel; NAKAGAWA, Akiko; NAKAMAE, Takashi; NARAYANASWAMY, Janardhanan C.; SAKAI, Yuki; SHIMIZU, Eiji; SIMON, Daniela; SIMPSON, Helen Blair; SORENI, Noam; STAEMPFLI, Philipp; STERN, Emily R.; SZESZKO, Philip; TAKAHASHI, Jumpei; VENKATASUBRAMANIAN, Ganesan; WANG, Zhen; YUN, Je-Yeon; STEIN, Dan J.; JAHANSHAD, Neda; THOMPSON, Paul M.; HEUVEL, Odile A. van den; SPALLETTA, Gianfranco; ASSOGNA, Francesca; CALVO, Rosa; WIT, Stella J. de; HOUGH, Morgan; KUNO, Masaru; MIGUEL, Euripedes C.; MORER, Astrid; PITTENGER, Christopher; POLETTI, Sara; SMERALDI, Enrico; SATO, Joao R.; TSUCHIYAGAITO, Aki; WALITZA, Susanne; WERF, Ysbrand D. van der; VECCHIO, Daniela; ZAREI, Mojtaba
    Microstructural alterations in cortico-subcortical connections are thought to be present in obsessive-compulsive disorder (OCD). However, prior studies have yielded inconsistent findings, perhaps because small sample sizes provided insufficient power to detect subtle abnormalities. Here we investigated microstructural white matter alterations and their relation to clinical features in the largest dataset of adult and pediatric OCD to date. We analyzed diffusion tensor imaging metrics from 700 adult patients and 645 adult controls, as well as 174 pediatric patients and 144 pediatric controls across 19 sites participating in the ENIGMA OCD Working Group, in a cross-sectional case-control magnetic resonance study. We extracted measures of fractional anisotropy (FA) as main outcome, and mean diffusivity, radial diffusivity, and axial diffusivity as secondary outcomes for 25 white matter regions. We meta-analyzed patient-control group differences (Cohen's d) across sites, after adjusting for age and sex, and investigated associations with clinical characteristics. Adult OCD patients showed significant FA reduction in the sagittal stratum (d=-0.21, z=-3.21, p=0.001) and posterior thalamic radiation (d=-0.26, z=-4.57, p<0.0001). In the sagittal stratum, lower FA was associated with a younger age of onset (z=2.71, p=0.006), longer duration of illness (z=-2.086, p=0.036), and a higher percentage of medicated patients in the cohorts studied (z=-1.98, p=0.047). No significant association with symptom severity was found. Pediatric OCD patients did not show any detectable microstructural abnormalities compared to controls. Our findings of microstructural alterations in projection and association fibers to posterior brain regions in OCD are consistent with models emphasizing deficits in connectivity as an important feature of this disorder.
  • article 68 Citação(ões) na Scopus
    Abnormal Brain Connectivity Patterns in Adults with ADHD: A Coherence Study
    (2012) SATO, Joao Ricardo; HOEXTER, Marcelo Queiroz; CASTELLANOS, Xavier Francisco; ROHDE, Luis A.
    Studies based on functional magnetic resonance imaging (fMRI) during the resting state have shown decreased functional connectivity between the dorsal anterior cingulate cortex (dACC) and regions of the Default Mode Network (DMN) in adult patients with Attention-Deficit/Hyperactivity Disorder (ADHD) relative to subjects with typical development (TD). Most studies used Pearson correlation coefficients among the BOLD signals from different brain regions to quantify functional connectivity. Since the Pearson correlation analysis only provides a limited description of functional connectivity, we investigated functional connectivity between the dACC and the posterior cingulate cortex (PCC) in three groups (adult patients with ADHD, n = 21; TD age-matched subjects, n = 21; young TD subjects, n = 21) using a more comprehensive analytical approach - unsupervised machine learning using a one-class support vector machine (OC-SVM) that quantifies an abnormality index for each individual. The median abnormality index for patients with ADHD was greater than for TD age-matched subjects (p = 0.014); the ADHD and young TD indices did not differ significantly (p = 0.480); the median abnormality index of young TD was greater than that of TD age-matched subjects (p = 0.016). Low frequencies below 0.05 Hz and around 0.20 Hz were the most relevant for discriminating between ADHD patients and TD age-matched controls and between the older and younger TD subjects. In addition, we validated our approach using the fMRI data of children publicly released by the ADHD-200 Competition, obtaining similar results. Our findings suggest that the abnormal coherence patterns observed in patients with ADHD in this study resemble the patterns observed in young typically developing subjects, which reinforces the hypothesis that ADHD is associated with brain maturation deficits.
  • article 3 Citação(ões) na Scopus
    Healthy individuals treated with clomipramine: an fMRI study of brain activity during autobiographical recall of emotions
    (2014) CERQUEIRA, C. T.; SATO, J. R.; ALMEIDA, J. R. C. de; AMARO JR., E.; LEITE, C. C.; GORENSTEIN, C.; GENTIL, V.; BUSATTO, G. F.
    Various functional magnetic resonance imaging studies addressed the effects of antidepressant drugs on brain functioning in healthy subjects; however, none specifically investigated positive mood changes to antidepressant drug. Sixteen subjects with no personal or family history of psychiatric disorders were selected from an ongoing 4-week open trial of small doses of clomipramine. Follow-up interviews documented clear positive treatment effects in six subjects, with reduced irritability and tension in social interactions, improved decision making, higher self-confidence and brighter mood. These subjects were then included in a placebo-controlled confirmatory trial and were scanned immediately after 4 weeks of clomipramine use and again 4 weeks after the last dose of clomipramine. The functional magnetic resonance imaging (fMRI) scans were run during emotion-eliciting stimuli. Repeated-measures analysis of variance of brain activity patterns showed significant interactions between group and treatment status during induced irritability (P < 0.005 cluster-based) but not during happiness. Individuals displaying a positive subjective response do clomipramine had higher frontoparietal cortex activity during irritability than during happiness and neutral emotion, and higher temporo-parieto-occipital cortex activity during irritability than during happiness. We conclude that antidepressants not only induce positive mood responses but also act upon autobiographical recall of negative emotions.