Brain Structural Alterations Underlying Mood-Related Deficits in Schizophrenia.

Area of Science:

• Neuroscience
• Psychiatry
• Neuroimaging

Background:

• Schizophrenia (SZ) is a complex psychiatric disorder with poorly understood neurodegenerative processes.
• Structural brain alterations in SZ, especially in fronto-temporal and limbic regions, require further investigation.
• Understanding these changes is crucial for differentiating SZ from other mood disorders.

Purpose of the Study:

• To investigate structural brain changes in schizophrenia patients, focusing on fronto-temporal and limbic regions.
• To explore the relationship between grey matter volume (GMV) and symptom severity in SZ.
• To specifically examine the association with mood- and emotion-related symptoms.

Main Methods:

• Structural MRI data from 74 SZ patients and 91 healthy controls (HCs) were analyzed.
• Voxel-based morphometry (VBM) was used to compare whole-brain grey matter volumes (GMVs).
• Correlations between GMV and symptom severity were assessed using PANSS and GP scales.

Main Results:

• SZ patients exhibited significant GMV reductions in fronto-temporal and limbic regions, including dlPFC and temporal pole, compared to HCs.
• A positive association was found between right inferior temporal gyrus (ITG) GMV and generalized psychopathology severity.
• Right ITG GMV also correlated with anxiety, depression, mannerisms, and unusual thought content, with mood symptoms being a key factor.

Conclusions:

• Findings indicate structural brain alterations in SZ, suggesting a progressive neurodegenerative pattern.
• The right ITG plays a significant role in mood- and emotion-related symptoms in SZ.
• Further research on the right ITG may offer insights into SZ pathophysiology and diagnostic differentiation.