Longitudinal gray matter change in young people who are at enhanced risk of schizophrenia due to intellectual impairment

TY - JOUR

T1 - Longitudinal gray matter change in young people who are at enhanced risk of schizophrenia due to intellectual impairment

AU - Moorhead, T William J

AU - Stanfield, Andrew C

AU - McKechanie, Andrew G

AU - Dauvermann, Maria R

AU - Johnstone, Eve C

AU - Lawrie, Stephen M

AU - Cunningham Owens, David G

N1 - Copyright © 2013 Society of Biological Psychiatry. Published by Elsevier Inc. All rights reserved.

PY - 2013/5/15

Y1 - 2013/5/15

N2 - BACKGROUND: Existing studies of brain structural changes before the onset of schizophrenia have considered individuals with either familial risk factors or prodromal symptomatology. We aimed to determine whether findings from these studies are also applicable to those at enhanced risk of developing schizophrenia for another reason-intellectual impairment.METHODS: Participants with intellectual impairment (mean IQ: 78.2) received magnetic resonance imaging of the brain at baseline (mean age: 16 years old) and again 6 years later. The Positive and Negative Syndrome Scale was used to assess psychotic symptoms. Participants were dichotomized using their Positive and Negative Syndrome Scale scores at follow-up and gray matter changes were compared between the groups using tensor based morphometry and semiautomated region of interest analysis.RESULTS: Forty-six individuals had scans of sufficient quality to be included in the study. The tensor based morphometry analyses revealed that those with psychotic symptoms at follow-up showed significantly greater gray matter reductions over 6 years in the medial temporal lobes bilaterally. Region of interest analyses revealed that those individuals with psychotic symptoms at follow-up showed a reduced right hippocampal volume at age 16 and reduced bilateral hippocampal volumes at follow-up.CONCLUSIONS: This unique study of individuals vulnerable to schizophrenia due to intellectual impairment highlights aberrant development in the medial temporal lobe associated with the occurrence of psychotic symptoms. These developmental changes are also evident in populations at enhanced risk of schizophrenia for familial and symptomatic reasons, suggesting they are central to the development of the disorder regardless of the nature of the vulnerability state.

AB - BACKGROUND: Existing studies of brain structural changes before the onset of schizophrenia have considered individuals with either familial risk factors or prodromal symptomatology. We aimed to determine whether findings from these studies are also applicable to those at enhanced risk of developing schizophrenia for another reason-intellectual impairment.METHODS: Participants with intellectual impairment (mean IQ: 78.2) received magnetic resonance imaging of the brain at baseline (mean age: 16 years old) and again 6 years later. The Positive and Negative Syndrome Scale was used to assess psychotic symptoms. Participants were dichotomized using their Positive and Negative Syndrome Scale scores at follow-up and gray matter changes were compared between the groups using tensor based morphometry and semiautomated region of interest analysis.RESULTS: Forty-six individuals had scans of sufficient quality to be included in the study. The tensor based morphometry analyses revealed that those with psychotic symptoms at follow-up showed significantly greater gray matter reductions over 6 years in the medial temporal lobes bilaterally. Region of interest analyses revealed that those individuals with psychotic symptoms at follow-up showed a reduced right hippocampal volume at age 16 and reduced bilateral hippocampal volumes at follow-up.CONCLUSIONS: This unique study of individuals vulnerable to schizophrenia due to intellectual impairment highlights aberrant development in the medial temporal lobe associated with the occurrence of psychotic symptoms. These developmental changes are also evident in populations at enhanced risk of schizophrenia for familial and symptomatic reasons, suggesting they are central to the development of the disorder regardless of the nature of the vulnerability state.

KW - Adolescent

KW - Adult

KW - Brain/pathology

KW - Chi-Square Distribution

KW - Disease Progression

KW - Female

KW - Functional Laterality

KW - Humans

KW - Image Processing, Computer-Assisted

KW - Intellectual Disability/etiology

KW - Longitudinal Studies

KW - Magnetic Resonance Imaging

KW - Male

KW - Nerve Fibers, Myelinated/pathology

KW - Schizophrenia/complications

KW - Schizophrenic Psychology

KW - Young Adult

U2 - 10.1016/j.biopsych.2012.12.011

DO - 10.1016/j.biopsych.2012.12.011

M3 - Article

C2 - 23332356

SN - 0006-3223

VL - 73

SP - 985

EP - 992

JO - Biological psychiatry

JF - Biological psychiatry

IS - 10

ER -