title: Impaired cell cycle control of neuronal precursor cells in the neocortical primordium of presenilin-1-deficient mice.
abstract: Recent studies have implicated presenilin-1 (PS-1) in the processing of the amyloid precursor protein and Notch-1. We show that PS-1 has biological effects on differentiation and cell cycle control of neuronal precursor cells in vivo using PS-1-deficient mice. The expression of Class III beta-tubulin was upregulated throughout the neocortical primordia of PS-1-deficient E14 embryos, especially on the ventricular surface. The increased speed of migration of the immature neurons from the ventricular zone outward in the PS-1-deficient neocortical primordia was indicated by an in vivo bromodeoxyuridine (BrdU)-labeling assay and a DiI-labeling assay in slice culture. Furthermore, we investigated the cell cycle of neuronal precursor cells in the neocortical ventricular zone using an in vivo cumulative BrdU-labeling assay. The length of the cell cycle in the neocortical precursor cells of wild-type mice was 11.4 hr whereas that of the PS-1-deficient mice was 15.4 hr. Among all phases of the cell cycle, S-phase exhibited the most prominent change in length, increasing from 2.4 hr in the wild-type mice to 7.4 hr in the mutant mice. The distribution of beta-catenin was specifically affected in the ventricular zone of the PS-1-deficient mice. These findings suggest that PS-1 is involved in the differentiation and the cell cycle control of neuronal precursor cells in the ventricular proliferating zone of the neocortical primordium.
authors.affiliation: Department of Anatomy and Developmental Biology, Chiba University, Graduate School of Medicine, Chiba, Japan.
authors.forename: Shigeki
authors.initials: S
authors.lastname: Yuasa
authors.forename: Mitsunari
authors.initials: M
authors.lastname: Nakajima
authors.forename: Hidenori
authors.initials: H
authors.lastname: Aizawa
authors.forename: Naruhiko
authors.initials: N
authors.lastname: Sahara
authors.forename: Ken-Ichi
authors.initials: K
authors.lastname: Koizumi
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Sakai
authors.forename: Mihoko
authors.initials: M
authors.lastname: Usami
authors.forename: Shin-Ichiro
authors.initials: S
authors.lastname: Kobayashi
authors.forename: Hidehito
authors.initials: H
authors.lastname: Kuroyanagi
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Mori
authors.forename: Haruhiko
authors.initials: H
authors.lastname: Koseki
authors.forename: Takuji
authors.initials: T
authors.lastname: Shirasawa
mesh_terms: D000483:Alleles; D000818:Animals; D002453:Cell Cycle / Q000235:genetics*; D002454:Cell Differentiation / Q000235:genetics*; D002465:Cell Movement / Q000235:genetics; D003598:Cytoskeletal Proteins / Q000378:metabolism; D005260:Female; D005333:Fetus; D018507:Gene Expression Regulation, Developmental / Q000502:physiology; D007150:Immunohistochemistry; D008565:Membrane Proteins / Q000172:deficiency* / Q000235:genetics / Q000378:metabolism; D051379:Mice; D018345:Mice, Knockout; D019579:Neocortex / Q000002:abnormalities* / Q000166:cytology / Q000378:metabolism*; D009474:Neurons / Q000166:cytology / Q000378:metabolism*; D011247:Pregnancy; D053764:Presenilin-1; D051881:Receptor, Notch1; D011956:Receptors, Cell Surface; D015398:Signal Transduction / Q000235:genetics; D013234:Stem Cells / Q000166:cytology / Q000378:metabolism*; D015534:Trans-Activators / Q000378:metabolism; D014157:Transcription Factors; D051176:beta Catenin
chemical_list: C495267:CTNNB1 protein, mouse; D003598:Cytoskeletal Proteins; D008565:Membrane Proteins; C497762:Notch1 protein, mouse; D053764:Presenilin-1; D051881:Receptor, Notch1; D011956:Receptors, Cell Surface; D015534:Trans-Activators; D014157:Transcription Factors; D051176:beta Catenin