title: Functional consequences of the lack of amyloid precursor protein in the mouse dentate gyrus in vivo.
abstract: The amyloid precursor protein (APP) plays a crucial role in the pathogenesis of Alzheimer's disease. Here, we studied whether the lack of APP affects the synaptic properties in the dentate gyrus by measuring granule cell field potentials evoked by perforant path stimulation in anesthetized 9-11-month-old APP-deficient mice in vivo. We found decreased paired-pulse facilitation, indicating altered presynaptic short-term plasticity in the APP-deficient dentate gyrus. In contrast, excitatory synaptic strength and granule cell firing were unchanged in APP knockout mice. Likewise, long-term potentiation (LTP) induced by a theta-burst stimulation protocol was not impaired in the absence of APP. These findings suggest that the deletion of APP may affect presynaptic plasticity of synaptic transmission at the perforant path-granule cell synapse but leaves synaptic efficacy intact and LTP preserved, possibly due to functional redundancy within the APP gene family.
authors.affiliation: Institute of Clinical Neuroanatomy, Neuroscience Center, Goethe-University, Frankfurt am Main, Germany. jedlicka@em.uni-frankfurt.de
authors.forename: Peter
authors.initials: P
authors.lastname: Jedlicka
authors.forename: Mirka
authors.initials: M
authors.lastname: Owen
authors.forename: Matej
authors.initials: M
authors.lastname: Vnencak
authors.forename: Jakob-A
authors.initials: JA
authors.lastname: Tschäpe
authors.forename: Meike
authors.initials: M
authors.lastname: Hick
authors.forename: Ulrike C
authors.initials: UC
authors.lastname: Müller
authors.forename: Thomas
authors.initials: T
authors.lastname: Deller
mesh_terms: D016564:Amyloid beta-Protein Precursor / Q000172:deficiency* / Q000502:physiology*; D000818:Animals; D018891:Dentate Gyrus / Q000502:physiology*; D019706:Excitatory Postsynaptic Potentials / Q000502:physiology; D017774:Long-Term Potentiation / Q000502:physiology; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout
chemical_list: D016564:Amyloid beta-Protein Precursor
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