title: GSK3beta activity modifies the localization and function of presenilin 1.
abstract: Presenilin 1, a causative gene product of familial Alzheimer disease, has been reported to be localized mainly in the endoplasmic reticulum and Golgi membranes. However, endogenous Presenilin 1 also localizes at the plasma membrane as a biologically active molecule. Presenilin 1 interacts with N-cadherin/beta-catenin to form a trimeric complex at the synaptic site through its loop domain, whose serine residues (serine 353 and 357) can be phosphorylated by glycogen synthase kinase 3beta. Here, we demonstrate that cell-surface expression of Presenilin 1/gamma-secretase is enhanced by N-cadherin-based cell-cell contact. Physical interaction between Presenilin 1 and N-cadherin/beta-catenin plays an important role in this process. Glycogen synthase kinase 3beta-mediated phosphorylation of Presenilin 1 reduces its binding to N-cadherin, thereby down-regulating its cell-surface expression. Moreover, reduction of the Presenilin 1.N-cadherin.beta-catenin complex formation leads to an impaired activation of contact-mediated phosphatidylinositol 3-kinase/Akt cell survival signaling. Furthermore, phosphorylation of Presenilin 1 hinders epsilon-cleavage of N-cadherin, whereas epsilon-cleavage of APP remained unchanged. This is the first report that clarifies the regulatory mechanism of Presenilin 1/gamma-secretase with respect to its subcellular distribution and its differential substrate cleavage. Because the cleavage of various membrane proteins by Presenilin 1/gamma-cleavage is involved in cellular signaling, glycogen synthase kinase 3beta-mediated phosphorylation of Presenilin 1 should be deeply associated with signaling functions. Our findings indicate that the abnormal activation of glycogen synthase kinase 3beta can reduce neuronal viability and synaptic plasticity via modulating Presenilin 1/N-cadherin/beta-catenin interaction and thus have important implications in the pathophysiology of Alzheimer disease.
authors: Horizontal Medical Research Organization, Kyoto University Graduate School of Medicine, Kyoto, Japan.
authors: Kengo
authors: K
authors: Uemura
authors: Akira
authors: A
authors: Kuzuya
authors: Yoshiharu
authors: Y
authors: Shimozono
authors: Nobuhisa
authors: N
authors: Aoyagi
authors: Koichi
authors: K
authors: Ando
authors: Shun
authors: S
authors: Shimohama
authors: Ayae
authors: A
authors: Kinoshita
mesh_terms: D000544:Alzheimer Disease / Q000201:enzymology; D053829:Amyloid Precursor Protein Secretases / Q000378:metabolism; D000818:Animals; D016466:CHO Cells; D015820:Cadherins / Q000378:metabolism; D002470:Cell Survival / Q000502:physiology; D006224:Cricetinae; D003412:Cricetulus; D004721:Endoplasmic Reticulum / Q000201:enzymology; D038362:Glycogen Synthase Kinase 3 / Q000378:metabolism*; D000071679:Glycogen Synthase Kinase 3 beta; D006056:Golgi Apparatus / Q000201:enzymology; D006801:Humans; D046912:Multiprotein Complexes / Q000378:metabolism; D009473:Neuronal Plasticity / Q000502:physiology*; D009474:Neurons / Q000201:enzymology*; D010766:Phosphorylation; D053764:Presenilin-1 / Q000378:metabolism*; D011499:Protein Processing, Post-Translational / Q000502:physiology*; D017434:Protein Structure, Tertiary / Q000502:physiology; D021381:Protein Transport / Q000502:physiology; D051057:Proto-Oncogene Proteins c-akt / Q000378:metabolism; D013569:Synapses / Q000201:enzymology*; D051176:beta Catenin / Q000378:metabolism
chemical_list: D015820:Cadherins; D046912:Multiprotein Complexes; D053764:Presenilin-1; D051176:beta Catenin; C000605506:GSK3B protein, human; D000071679:Glycogen Synthase Kinase 3 beta; D051057:Proto-Oncogene Proteins c-akt; D038362:Glycogen Synthase Kinase 3; D053829:Amyloid Precursor Protein Secretases