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Zebrafish lacking Alzheimer presenilin enhancer 2 (Pen-2) demonstrate excessive p53-dependent apoptosis and neuronal loss.

Journal article
Authors William A Campbell
Hongwei Yang
Henrik Zetterberg
Stéphanie Baulac
Jacqueline A Sears
Tianming Liu
Stephen T C Wong
Tao P Zhong
Weiming Xia
Published in Journal of neurochemistry
Volume 96
Issue 5
Pages 1423-40
ISSN 0022-3042
Publication year 2006
Published at Institute of Neuroscience and Physiology, Department of Psychiatry and Neurochemistry
Pages 1423-40
Language en
Links dx.doi.org/10.1111/j.1471-4159.2006...
Keywords Alzheimer Disease, Animals, Animals, Genetically Modified, Apoptosis, genetics, Blotting, Northern, Blotting, Western, methods, Body Patterning, drug effects, genetics, Cell Count, methods, Disease Models, Animal, Dose-Response Relationship, Drug, Embryo, Nonmammalian, Fish Proteins, chemistry, deficiency, physiology, Gene Expression Regulation, Developmental, drug effects, genetics, Immunohistochemistry, methods, In Situ Hybridization, methods, In Situ Nick-End Labeling, methods, Indoles, diagnostic use, Membrane Proteins, chemistry, deficiency, metabolism, physiology, Neurons, metabolism, Oligonucleotides, Antisense, pharmacology, Presenilin-2, RNA, Messenger, metabolism, Receptors, Notch, metabolism, Reverse Transcriptase Polymerase Chain Reaction, methods, Tumor Suppressor Protein p53, chemistry, metabolism, Zebrafish, Zebrafish Proteins, deficiency, metabolism
Subject categories Psychiatry

Abstract

Gamma-secretase cleavage, mediated by a complex of presenilin, presenilin enhancer (Pen-2), nicastrin, and Aph-1, is the final proteolytic step in generating amyloid beta protein found in brains of Alzheimer's disease patients and Notch intracellular domain critical for proper neuronal development. Here, we employ the zebrafish model to study the role of Pen-2 in neuronal survival. We found that (i) knockdown of Pen-2 using antisense morpholino led to a reduction of islet-1 positive neurons, (ii) Notch signaling was reduced in embryos lacking Pen-2 or other gamma-secretase components, (iii) neuronal loss in Pen-2 knockdown embryos is not as a result of a lack of neuronal precursor cells or cell proliferation, (iv) absence of Pen-2 caused massive apoptosis in the whole animal, which could be suppressed by simultaneous knockdown of the tumor suppressor p53, (v) loss of islet-1 or acetylated tubulin positive neurons in Pen-2 knockdown embryos could be partially rescued by knockdown of p53. Our results demonstrate that knockdown of Pen-2 directly induces a p53-dependent apoptotic pathway that contributes to neuronal loss and suggest that Pen-2 plays an important role in promoting neuronal cell survival and protecting from apoptosis in vivo.

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http://www.gu.se/english/research/publication/?publicationId=95970
Utskriftsdatum: 2020-02-20