Cingulate cortex synaptic terminal proteins and neural cell adhesion molecule in schizophrenia

Area of Science:

• Neuroscience
• Psychiatry
• Cell Biology

Background:

• Neuronal organization and afferent innervation are altered in the schizophrenia cingulate cortex.
• Synaptic terminal changes are suspected in schizophrenia's cingulate cortex.

Purpose of the Study:

• To investigate synaptic terminal protein alterations in the cingulate cortex in schizophrenia.
• To determine if specific proteins like syntaxin, synaptophysin, and neural cell adhesion molecule are affected.

Main Methods:

• Used immunocytochemistry with monoclonal antibodies (SP6 for syntaxin, SP4 for synaptophysin, SP12 for synaptosomal-associated protein-25).
• Analyzed cingulate cortex tissue from schizophrenia patients and controls.
• Performed multivariate analysis controlling for age and post mortem interval.

Main Results:

• Syntaxin and neural cell adhesion molecule immunoreactivity were significantly elevated in schizophrenia patients compared to controls.
• Syntaxin had a wider distribution than synaptophysin in the cingulate cortex.
• The neural cell adhesion molecule to synaptophysin ratio increased, suggesting less mature synapses.

Conclusions:

• Elevated syntaxin suggests increased glutamatergic afferents in schizophrenia's cingulate cortex.
• Increased neural cell adhesion molecule to synaptophysin ratio indicates potential synaptic immaturity.
• Synaptic function in the cingulate cortex may be abnormal in schizophrenia.