Publications by authors named "Lenroot R"

Using the Cascade of Care framework, we explored the demographic and clinical characteristics of students at six stages in an early psychosis detection program at a college counseling center, with a focus on the transition between stages with the highest disengagement. We detailed and compared the demographic and clinical characteristics of those who (1) completed the Prodromal Questionnaire-Brief (PQ-B, N = 1588); (2) met the PQ-B cutoff score (n = 486); (3) were referred for secondary phone screening (n = 404); (4) completed secondary phone screening (n = 198); (5) completed a Coordinated Specialty Care (CSC) eligibility assessment (n = 51); and (6) were enrolled in CSC (n = 21). Education level and gender identity were associated with engagement at multiple stages of the early detection cascade.

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  • Previous research has indicated that the innate immune system, particularly through Toll-like receptors (TLRs), may play a role in schizophrenia (SZ), with TLRs reacting to pathogens like bacteria and viruses.
  • A study comparing TLR levels in white blood cells of 86 SZ patients and 77 healthy controls found higher TLR4 and TLR8 levels and lower TLR3 levels in those with SZ, suggesting enhanced immune activation.
  • The study also revealed a link between TLR levels and the thickness of the cingulate gyrus, implying that bacterial influences might be more significant than viral ones in SZ, contributing to changes in brain structure.
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  • * Conducted as a randomized, double-blind trial, 27 patients received either canakinumab or a placebo, with measures taken on inflammation markers and symptom severity over 8 weeks.
  • * Results showed significant reductions in hsCRP (an inflammation marker) only in the canakinumab group, indicating potential benefits for symptom severity and inflammation in these patients.
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  • Autism shows a wide variation in physical and brain structure characteristics, with previous brain imaging studies on certain brain regions in autism yielding conflicting results.
  • Researchers analyzed a large dataset of MRI scans to explore differences in the thalamus, globus pallidus, and striatum related to factors like sex, age, and IQ.
  • They found no overall size differences in these brain regions but identified localized shape variations that change with age, suggesting that the neurodevelopment of these areas is atypical in autism and varies significantly throughout a person's life.
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Objective: Programs for early detection of psychosis help identify individuals experiencing emerging psychosis and link them with appropriate services, thereby reducing the duration of untreated psychosis (DUP). The authors used the cascade-of-care framework to identify various care stages between screening and enrollment in coordinated specialty care (CSC) and to determine attrition at each stage, with the goal of identifying points in the referral process that may affect DUP.

Methods: Project partners included a college counseling center and CSC program.

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Aim: This exploratory study aimed to examine differences in rates of self and clinician-reports of trauma in youth at clinical high risk for psychosis (CHR) and whether rates of reporting differed by ethnicity.

Methods: Self-reported history of trauma was collected at intake amongst youth at CHR enrolled in Coordinated Specialty Care (CSC) services (N = 52). A structured chart review was conducted for the same sample to identify clinician-reported history of trauma throughout treatment in CSC.

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  • The human brain evolves over time, with changes in structure affecting mental health and diseases throughout life.
  • This study identifies genetic variants that influence brain growth and shrinkage, using data from 15,640 individuals and focusing on 15 brain structures.
  • Key genes linked to metabolism were found, highlighting connections to conditions like depression and schizophrenia, and suggesting that understanding these genetic factors could lead to insights about healthy and problematic brain development and aging.
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Objective: Recent studies of patients with bipolar disorder or at high genetic risk reveal structural dysconnections among key brain networks supporting cognitive and affective processes. Understanding the longitudinal trajectories of these networks across the peak age range of bipolar disorder onset could inform mechanisms of illness onset or resilience.

Methods: Longitudinal diffusion-weighted MRI and phenotypic data were acquired at baseline and after 2 years in 183 individuals ages 12-30 years in two cohorts: 97 unaffected individuals with a first-degree relative with bipolar disorder (the high-risk group) and 86 individuals with no family history of mental illness (the control group).

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Background: Motor impairment is widely acknowledged as a core feature in children with autism spectrum disorder (ASD), which can affect adaptive behavior and increase severity of symptoms. Low-cost motion capture and virtual reality (VR) game technologies hold a great deal of promise for providing personalized approaches to motor intervention in ASD. The present study explored the feasibility, acceptability and potential efficacy of a custom-designed VR game-based intervention (GaitWayXR™) for improving gross motor skills in youth with ASD.

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Background: Bipolar disorder (BD) is associated with cortical and subcortical structural brain abnormalities. It is unclear whether such alterations progressively change over time, and how this is related to the number of mood episodes. To address this question, we analyzed a large and diverse international sample with longitudinal magnetic resonance imaging (MRI) and clinical data to examine structural brain changes over time in BD.

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  • - Growing evidence suggests that the complement system may play a role in schizophrenia, but the specific disturbances in complement factors among patients are not fully understood.
  • - In a study with 75 healthy controls and 90 patients with schizophrenia, researchers analyzed blood samples and MRI scans to assess complement factor levels and cortical thickness.
  • - Findings revealed increased levels of specific complement receptors, regulators, and proteins in schizophrenia patients, with elevated C4a levels linked to higher inflammation and reduced cortical thickness in certain brain regions.
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Proton magnetic resonance spectroscopy (H-MRS) studies have examined glutamatergic abnormalities in schizophrenia and bipolar-I disorders, mostly in single voxels. Though the critical nodes remain unknown, schizophrenia and bipolar-I involve brain networks with broad abnormalities. To provide insight on the biochemical differences that may underlie these networks, the combined glutamine and glutamate signal (Glx) and other metabolites were examined in patients in early psychosis with whole brain H-MRS imaging (H-MRSI).

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Objective: The primary objectives of this study were to examine referral sources and demographic, clinical, and socioenvironmental characteristics of Hispanics referred to and enrolled in a program of coordinated specialty care (Early CSC program) for first-episode psychosis, to compare them with characteristics of other referred and enrolled racial-ethnic groups, and to identify factors associated with enrollment in the program.

Methods: A retrospective review was conducted for all individuals referred to and enrolled in the Early CSC program over a 2-year period. Extracted data included referral sources and demographic and clinical characteristics.

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  • Research suggests that inflammation may play a significant role in the cognitive and neurological changes associated with schizophrenia, including increased peripheral inflammation and cortical thinning.
  • A study involving 644 controls and 499 schizophrenia patients found that levels of C-reactive protein (CRP), a marker of inflammation, were significantly higher in schizophrenia patients and linked to attention deficits and reduced cortical thickness in specific brain regions.
  • These findings highlight the potential of using CRP as a biomarker to identify individuals with schizophrenia who may benefit from anti-inflammatory treatments, indicating a connection between inflammation and cognitive impairment in the disorder.
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Autism spectrum disorder (ASD) is associated with atypical brain development. However, the phenotype of regionally specific increased cortical thickness observed in ASD may be driven by several independent biological processes that influence the gray/white matter boundary, such as synaptic pruning, myelination, or atypical migration. Here, we propose to use the boundary sharpness coefficient (BSC), a proxy for alterations in microstructure at the cortical gray/white matter boundary, to investigate brain differences in individuals with ASD, including factors that may influence ASD-related heterogeneity (age, sex, and intelligence quotient).

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Bipolar disorder is associated with cognitive deficits and cortical changes for which the developmental dynamics are not well understood. The dopamine D2 receptor (DRD2) gene has been associated with both psychiatric disorders and cognitive variability. Here we examined the mediating role of brain structure in the relationship between DRD2 genomic variation and cognitive performance, with target cortical regions selected based on evidence of association with DRD2, bipolar disorder and/or cognition from prior literature.

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Adolescence is a transitional period between childhood and adulthood characterized by significant changes in global and regional brain tissue volumes. It is also a period of increasing vulnerability to psychiatric illness. The relationship between these patterns and increased levels of circulating sex steroids during adolescence remains unclear.

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  • High levels of glucocorticoids are harmful to the brain, but the adrenal steroid DHEA has protective effects and is linked to schizophrenia with altered levels and ratios.
  • A study compared serum DHEA and cortisol/DHEA ratios in 94 people with schizophrenia and 81 healthy controls, finding higher DHEA and lower cortisol/DHEA ratios in patients.
  • The cortisol/DHEA ratio correlated negatively with brain volumes in key regions, suggesting it could indicate brain damage and highlighting the importance of DHEA in understanding schizophrenia's mechanisms.
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The hippocampus consists of anatomically and functionally distinct subfields that may be differentially involved in the pathophysiology of bipolar disorder (BD). Here we, the Enhancing NeuroImaging Genetics through Meta-Analysis Bipolar Disorder workinggroup, study hippocampal subfield volumetry in BD. T1-weighted magnetic resonance imaging scans from 4,698 individuals (BD = 1,472, healthy controls [HC] = 3,226) from 23 sites worldwide were processed with FreeSurfer.

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  • First-degree relatives of schizophrenia patients (SZ-FDRs) exhibit similar brain and cognitive abnormalities as patients, while those related to bipolar disorder (BD-FDRs) show larger brain volume but inconsistent cognitive patterns.
  • A meta-analysis involving nearly 6,000 participants found that SZ-FDRs have a thinner cortex and lower IQ scores compared to controls, whereas BD-FDRs show a larger cortical surface area with only slight IQ reductions.
  • Both relative groups achieved similar educational levels, indicating that structural brain differences are likely connected to the predisposition for schizophrenia or bipolar disorder rather than general cognitive impairments.
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Background: Bipolar disorder (BD) is a familial psychiatric disorder associated with frontotemporal and subcortical brain abnormalities. It is unclear whether such abnormalities are present in relatives without BD, and little is known about structural brain trajectories in those at risk.

Method: Neuroimaging was conducted at baseline and at 2-year follow-up interval in 90 high-risk individuals with a first-degree BD relative (HR), and 56 participants with no family history of mental illness who could have non-BD diagnoses.

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  • The ENIGMA Consortium aims to enhance neuroimaging studies by combining data from various institutions, tackling the issue of small sample sizes but facing challenges due to diverse scanning devices.
  • This study tested the effectiveness of the ComBat batch adjustment method to reduce site-related differences and improve statistical outcomes in comparing brain structure between individuals with schizophrenia and healthy controls.
  • Results showed that using ComBat significantly boosted statistical significance and power in analyses, making it a recommended tool for ENIGMA and other multi-site neuroimaging projects, with user-friendly R functions available for implementation.
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Proton magnetic resonance spectroscopy (H-MRS) studies have examined glutamatergic abnormalities in schizophrenia, mostly in single voxels. Though the critical brain nodes remain unknown, schizophrenia involves networks with broad abnormalities. Hence, glutamine plus glutamate (Glx) and other metabolites were examined with whole-brain H-MRS, in early schizophrenia.

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