Neuronal alterations in AKT isotype expression in schizophrenia

Area of Science:

• Neuroscience
• Molecular Biology
• Metabolic Disorders

Background:

• Schizophrenia is linked to brain function alterations.
• Insulin signaling pathways, especially AKT, are implicated in schizophrenia pathophysiology.

Purpose of the Study:

• Investigate AKT and related insulin signaling pathway components in schizophrenia.
• Examine transcript and protein levels, and AKT activity.
• Explore sex-specific differences and medication independence.

Main Methods:

• Analysis of mRNA and protein expression in neuronal samples.
• Assessment of AKT activity and related signaling molecules.
• Comparison between schizophrenia subjects and controls, considering sex and medication status.

Main Results:

• Elevated AKT1-3 mRNA expression in schizophrenia neurons, contrasting with stable or reduced total AKT protein.
• Sex-specific differences in AKT activity observed.
• Upregulation of PDPK1, protein phosphatases, and transcription factor FOXO1 detected.
• Findings largely independent of antipsychotic medication.

Conclusions:

• Suggests a decoupling of AKT transcript and protein levels in schizophrenia.
• Highlights potential compensatory mechanisms in insulin signaling.
• Indicates AKT pathway alterations are inherent to schizophrenia.
• Emphasizes the need for understanding these pathways for therapeutic development.