Neuronal alterations in AKT isotype expression in schizophrenia

Emily A. Devine, Ali S. Imami, Hunter Eby, Smita Sahay, Abdul Rizaq Hamoud, Hasti Golchin, William Ryan, Elizabeth A. Shedroff, Taylen Arvay, Alex W. Joyce, Sophie M. Asah, Consuelo Walss-Bass, Sinead O’Donovan, Robert E. McCullumsmith

Research output: Contribution to journalArticlepeer-review

Abstract

Schizophrenia is characterized by substantial alterations in brain function, and previous studies suggest insulin signaling pathways, particularly involving AKT, are implicated in the pathophysiology of the disorder. This study demonstrates elevated mRNA expression of AKT1-3 in neurons from schizophrenia subjects, contrary to unchanged or diminished total AKT protein expression reported in previous postmortem studies, suggesting a potential decoupling of transcript and protein levels. Sex-specific differential AKT activity was observed, indicating divergent roles in males and females with schizophrenia. Alongside AKT, upregulation of PDPK1, a critical component of the insulin signaling pathway, and several protein phosphatases known to regulate AKT were detected. Moreover, enhanced expression of the transcription factor FOXO1, a regulator of glucose metabolism, hints at possible compensatory mechanisms related to insulin signaling dysregulation. Findings were largely independent of antipsychotic medication use, suggesting inherent alterations in schizophrenia. These results highlight the significance of AKT and related signaling pathways in schizophrenia, proposing that these changes might represent a compensatory response to a primary defect of canonical insulin signaling pathways. This research underscores the need for a detailed understanding of these signaling pathways for the development of effective therapeutic strategies.

Original languageEnglish
JournalMolecular Psychiatry
DOIs
Publication statusAccepted/In press - 2024
Externally publishedYes

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