Increased phosphorylation of Ser473-Akt, Ser9-GSK-3β and Ser133-CREB in the rat frontal cortex after MK-801 intraperitoneal injection

Yong Min Ahn, Suk Seo Myoung, Hyun Kim Se, Yeni Kim, Chang Yoon Se, Yong Sung Juhnn, Sik Kim Yong

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

GSK-3β is regarded as playing an important part in the pathogenesis of schizophrenia and the action of psychotomimetic agents. We observed phosphorylation of molecules associated with the GSK-3β signalling pathway in the rat brain after MK-801 injection, which induces a schizophrenia-like state in humans. Ser9-GSK-3β phosphorylation was increased after injection of 1 mg/kg MK-801 in the rat frontal cortex but not in the hippocampus or cerebellum. This increase peaked at 30 min and was maintained until 90 min after injection. The phosphorylation showed a dose-dependent increase up to 1 mg/kg MK-801, followed by a decrease at higher dosage. Furthermore, phosphorylation of Ser473-Akt and Ser133-CREB showed similar temporal, dose-dependent and regionally specific patterns with those of Ser9-GSK-3β. However, phosphorylation of Dvl and Ser33-β-catenin was not affected by MK-801. These results suggest that GSK-3β phosphorylation by MK-801 may be associated with the Akt-GSK-3β pathway rather than with the Wnt-Dvl-GSK3β pathway.

Original languageEnglish
Pages (from-to)607-613
Number of pages7
JournalInternational Journal of Neuropsychopharmacology
Volume8
Issue number4
DOIs
StatePublished - Dec 2005

Keywords

  • Akt
  • CREB
  • GSK-3β
  • MK-801

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