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Increased pituitary volume in schizophrenia spectrum disorders
Tsutomu Takahashi1, Michio Suzuki, Dennis Velakoulis
1Melbourne Neuropsychiatry Centre, Department of Psychiatry, University of Melbourne and Melbourne Health, Victoria 3053, Australia. tsutomu@med.u-toyama.ac.jp
Schizophrenia Research
|January 24, 2009
Summary
Schizophrenia and schizotypal disorder patients show larger pituitary gland volumes than healthy controls. This suggests shared hypothalamic-pituitary-adrenal axis hyperactivity, indicating a common stress vulnerability across the schizophrenia spectrum.
Area of Science:
- Neuroimaging
- Psychiatry
- Endocrinology
Background:
- Hypothalamic-pituitary-adrenal (HPA) axis hyperactivity is linked to psychotic disorders.
- Previous MRI studies on pituitary gland volume in schizophrenia have produced conflicting results.
- Pituitary volume changes in schizotypal disorder remain largely uninvestigated.
Purpose of the Study:
- To investigate pituitary gland volume using MRI in patients with schizotypal disorder and schizophrenia.
- To compare pituitary volumes between patient groups and healthy controls.
- To explore potential associations between pituitary volume and clinical factors.
Main Methods:
- Magnetic resonance imaging (MRI) was used to measure pituitary gland volume.
- Study included 47 schizotypal disorder patients, 72 schizophrenia patients, and 81 healthy controls.
- Analyses controlled for age and gender.
Main Results:
- Both schizophrenia and schizotypal disorder groups exhibited significantly larger pituitary volumes compared to healthy controls.
- No significant difference in pituitary volume was observed between schizophrenia and schizotypal disorder patients.
- Pituitary volume was larger in females than males across all groups.
- No correlation found between pituitary volume and antipsychotic medication type, dosage, or duration.
Conclusions:
- Findings support the stress-diathesis model of schizophrenia.
- Elevated pituitary volume in schizotypal disorder suggests shared HPA axis hyperactivity with schizophrenia.
- This indicates a potential common vulnerability to stress within the schizophrenia spectrum.
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