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 language | English |
---|---|
Pages (from-to) | 607-613 |
Number of pages | 7 |
Journal | International Journal of Neuropsychopharmacology |
Volume | 8 |
Issue number | 4 |
DOIs | |
State | Published - Dec 2005 |
Keywords
- Akt
- CREB
- GSK-3β
- MK-801