|Schizophrenia and NeuroDevelopment|
|Neurobiology and schizophrenia|
|Medical studies that shows that some NeuroDevelopment disorders and brain morphology performs into NeuroDevelopment of human brain morphology in health and disease, and particularly into brain abnormalities in schizophrenia, autism, ADHD, depression, and focal brain damage using magnetic resonance imaging.|
|Studies found some relation of Cerebral Gray Matter Volume to Age for Schizophrenia.
Comparing gray matter for age for the patients with schizophrenia and for
the healthy comparison subjects (after correction for sex and total intracranial volume).
Observed a diference between the
gray matter volume and expected (grand average) volume
on the basis of the normal gray matter volume by sex and intracranial volume.
SchizophreniaStudies in 159 patients with schizophrenia revealed evidence for global and focal (progressive) brain abnormalities in schizophrenia. (Hulshoff 2001).
|Total brain is smaller (-2.2%),|
|cerebral gray matter smaller (-3.3%)|
|prefrontal gray matter also small (-4.4%), and
||lateral (27%) and third (30%) ventricle and peripheral CSF (11%) volumes were larger
Moreover, in this study, the smaller gray matter volume was more
pronounced in older patients with schizophrenia which may suggest
progressive loss of cerebral gray matter in schizophrenia patients. |
Using voxel- Based morphometry in the MRI scans of these subjects, gray matter density was found decreased in distinct focal areas in the brains of patients with schizophrenia or schizophreniform disorder (Hulshoff Pol et al, Arch Gen Psychiatry 2002; click to look at a movie). Decreases in gray matter density were found in the left amygdala; left hippocampus; right supramarginal gyrus; thalamus; (orbito) frontal, (supeerior) temporal, occipitotemporal, precuneate, posterior cingulate, and insular cortices bilaterally in the patients. Moreover, in this study the decreased density in the left amygdala was more pronounced in older patients with schizophrenia.
|Focal decreases (A- C) and increases (D) in gray matter density in patients
with schizophrenia compared with healthy comparision control subjects.
results in a movie (.avi format, 550 kB)
Schizophrenia, genetics and environmentThe brain abnormalities in schizophrenia have been associated with an increased genetic risk in schizophrenia. In a study in monozygotic and dizygotic twins discordant for schizophrenia and healthy comparison twins (Baare et al, Arch Gen Psychiatry 2001) smaller intracranial volumes in the monozygotic patients and their cotwins suggested that increased genetic risk to develop schizophrenia is related to reduced brain growth early in life. Additional reduction in whole- Brain volume in the patients suggested that the manifestation of the disorder is related to (neurodegenerative) processes that are most likely non-genetic in origin. In a study in patients with schizophrenia, their healthy non-twin same-sex siblings, and unrelated healthy comparison subjects, siblings shared a decreased thalamus (Staal et al, Am J Psychiatry 1998) and enlarged third ventricle volume with their affected siblings (Staal et al, Am J Psychiatry, 2000), suggesting these may be related to genetic defects that produced a susceptibility to schizophrenia. Other abnormalities were found to be related to particular environmental factors including famine (Hulshoff Pol et al, Am J Psychiatry, 2000) and antipsychotic drug use (Scheepers et al, Am J Psychiatry 2001; Scheepers et al, Neuropsychopharmacology). Indications were found for a relation with symptomatology (Baare et al, Biological Psychiatry 1999) and outcome (Staal et al, Am J Psychiatry 2001) of the disease.
From this work it can be concluded that some of the brain abnormalities are progressive in schizophrenia possibly reflecting an active disease process, part of which are genetically mediated, although influence of environmental factors cannot be excluded. Future studies will be performed into the onset and progression of brain abnormalities in schizophrenia, autism and other brain (developmental) disorders.
A significant group effect indicated that twins discordant for schizophrenia had significantly smaller whole- Brain volumes than healthy twins. Patients as well as their cotwins had reduced whole- Brain volumes. Moreover, patients had significantly smaller brains than their cotwins
|Neurobiology and schizophrenia
|| Twenty- Nine Medical Causes of "Schizophrenia"
|| NeuroDevelopment and Schizophrenia - Cambridge University Press
||The Contribution of Early Traumatic Events to Schizophrenia in Some Patients: A Traumagenic NeuroDevelopment al Model