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Reduced synaptic vesicle density and active zone size in mice lacking amyloid precursor protein (APP) and APP-like protein 2.

Abstract：

:Although abnormal processing of amyloid precursor protein (APP) leads to early onset of Alzheimer's disease, the normal function of this protein is poorly understood. APP is widely expressed in axons, dendrites, and synapses in both central and peripheral nervous systems. Mice homozygous for APP or its homologue APP-like protein 2 (APLP2) null mutation (KO) are viable, but double mutants for APP and APLP2 deletions (DKO) are early postnatal lethal. To investigate the role of APP in synapse development, we compared the ultrastructure of submandibular ganglion synapses between DKO and littermate APLP2 KO mice at birth. Using serial electron microscopy, we found that the size of presynaptic boutons and the number of active zones per bouton were comparable in both strains of animals. However, the synaptic vesicle density, active zone size, and docked vesicle number per active zone were significantly reduced in DKO compared to those in APLP2 KO. These results indicate that the APP family of proteins plays an important role in regulating the formation and function of inter-neuronal synapses.

journal_name

Neurosci Lett

journal_title

Neuroscience letters

authors

Yang G,Gong YD,Gong K,Jiang WL,Kwon E,Wang P,Zheng H,Zhang XF,Gan WB,Zhao NM

doi

10.1016/j.neulet.2005.04.040

keywords:

subject

Has Abstract

pub_date

2005-08-12 00:00:00

pages

66-71

issue

1-2

eissn

0304-3940

issn

1872-7972

pii

S0304-3940(05)00426-X

journal_volume

384

pub_type

杂志文章

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