Elevated dopamine receptor-coupled Gs protein measures in mononuclear leukocytes of patients with schizophrenia

Sofia Avissar, Liza Barki-Harrington, Yakov Nechamkin, Gregori Roitman, Gabriel Schreiber

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


Heterotrimeric G proteins play a pivotal role in post-receptor information transduction and were previously implicated in the pathophysiology and treatment of mood disorders. Changes previously detected in G protein levels in post-mortem brain of patients with schizophrenia could reflect effects of antipsychotic medication. The present study aims at quantitatively and functionally evaluating receptor-coupled G proteins in mononuclear leukocytes obtained from 23 untreated patients with schizophrenia and 30 healthy subjects in an attempt to unravel a pattern of G protein measures in schizophrenia distinctive from patterns previously obtained in mood disorders. Dopamine-enhanced guanine nucleotide binding capacity to Gs protein through D1/D5 receptor in mononuclear leukocytes of untreated patients with schizophrenia was significantly increased in comparison with healthy subjects, and positively correlated with both the total PANSS score and the positive subscale. β-Adrenergic and muscarinic receptor-coupled G protein functions, as well as Gsα, Giα and Gβ immunoreactivities, were similar to healthy subjects. These findings, distinctive for schizophrenia, unrelated to drug treatment, and differential from previous findings in mania and depression, may potentially help to differentially diagnose, after the first psychotic episode, between the major psychoses: schizophrenia and manic-depressive illness.

Original languageEnglish
Pages (from-to)37-47
Number of pages11
JournalSchizophrenia Research
Issue number1
StatePublished - 15 Jan 2001


  • Dopamine
  • G protein
  • Muscarinic
  • Schizophrenia
  • β-Adrenergic

ASJC Scopus subject areas

  • Psychiatry and Mental health
  • Biological Psychiatry


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