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Experimental Genetics Group
Neurobiol Dis. 2009 Aug;35(2):193-200. Dewachter I1, Ris L2, Jaworski T1, Seymour CM1, Kremer A1, Borghgraef P1, De Vijver H1, Godaux E2, Van Leuven F1*. 1Experimental Genetics Group, Department of Human Genetics, K.U.Leuven, Leuven, Belgium. 2Laboratory of Neurosciences, University of Mons-Hainaut, Mons, Belgium. *Corresponding author. Accumulating evidence implicates deregulation of GSK3ss as a converging pathological event in Alzheimer's disease and in neuropsychiatric disorders, including bipolar disorder and schizophrenia. Although these neurological disorders share cognitive dysfunction as a hallmark, the role of GSK3ss in learning and memory remains to be explored in depth. We here report increased phosphorylation of GSK3ss at Serine-9 following cognitive training in two different hippocampus dependent cognitive tasks, i.e. inhibitory avoidance and novel object recognition task. Conversely, transgenic mice expressing the phosphorylation defective mutant GSK3ss[S9A] show impaired memory in these tasks. Furthermore, GSK3ss[S9A] mice displayed impaired hippocampal L-LTP and facilitated LTD. Application of actinomycin, but not anisomycin, mimicked GSK3ss[S9A] induced defects in L-LTP, suggesting that transcriptional activation is affected. This was further supported by decreased expression of the immediate early gene c-Fos, a target gene of CREB. The combined data demonstrate a role for GSK3ss in long term memory formation, by inhibitory phosphorylation at Serine-9. The findings are fundamentally important and relevant in the search for therapeutic strategies in neurological disorders associated with cognitive impairment and deregulated GSK3ss signaling, including AD, bipolar disorder and schizophrenia.  FULL TEXT |
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