Volume 11, Issue 6 pp. 1084-1093
Original Article

Tyr682 in the Aβ-precursor protein intracellular domain regulates synaptic connectivity, cholinergic function, and cognitive performance

Carmela Matrone

Corresponding Author

Carmela Matrone

CNR - National Research Council, Cell Biology and Neurobiology Institute, Rome, 00143 Italy

Department of Medical Biochemistry, University of Aarhus, 8000 Aarhus C, Denmark

These authors contributed equally to this work.

Correspondence

Carmela Matrone, Department of Medical Biochemistry, University of Aarhus, 8000 Aarhus C, Denmark. Tel.: +45 87167821; fax: +45 86131160; e-mail: [email protected] or Luciano D'Adamio, Department of Microbiology and Immunology, Einstein College of Medicine, Bronx, New York, NY 10461, USA. Tel.: +1 718 430 3244; fax: +1 718 430 8711; e-mail: [email protected]

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Siro Luvisetto

Siro Luvisetto

CNR - National Research Council, Cell Biology and Neurobiology Institute, Rome, 00143 Italy

These authors contributed equally to this work.Search for more papers by this author
Luca R. La Rosa

Luca R. La Rosa

CNR - National Research Council, Cell Biology and Neurobiology Institute, Rome, 00143 Italy

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Robert Tamayev

Robert Tamayev

Department of Microbiology and Immunology, Einstein College of Medicine, Bronx, NY, 10461 USA

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Annabella Pignataro

Annabella Pignataro

CNR - National Research Council, Cell Biology and Neurobiology Institute, Rome, 00143 Italy

Santa Lucia Foundation, Experimental Neurology Unit, Rome, 00143 Italy

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Nadia Canu

Nadia Canu

CNR - National Research Council, Cell Biology and Neurobiology Institute, Rome, 00143 Italy

Department of Systems Medicine, University of Tor Vergata, Rome, 00133 Italy

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Li Yang

Li Yang

Huffington Center on Aging and Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, 77030 USA

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Alessia P. M. Barbagallo

Alessia P. M. Barbagallo

Department of Microbiology and Immunology, Einstein College of Medicine, Bronx, NY, 10461 USA

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Fabrizio Biundo

Fabrizio Biundo

Department of Microbiology and Immunology, Einstein College of Medicine, Bronx, NY, 10461 USA

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Franco Lombino

Franco Lombino

Department of Microbiology and Immunology, Einstein College of Medicine, Bronx, NY, 10461 USA

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Hui Zheng

Hui Zheng

Huffington Center on Aging and Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, 77030 USA

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Martine Ammassari-Teule

Martine Ammassari-Teule

CNR - National Research Council, Cell Biology and Neurobiology Institute, Rome, 00143 Italy

Santa Lucia Foundation, Experimental Neurology Unit, Rome, 00143 Italy

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Luciano D'Adamio

Corresponding Author

Luciano D'Adamio

Department of Microbiology and Immunology, Einstein College of Medicine, Bronx, NY, 10461 USA

Correspondence

Carmela Matrone, Department of Medical Biochemistry, University of Aarhus, 8000 Aarhus C, Denmark. Tel.: +45 87167821; fax: +45 86131160; e-mail: [email protected] or Luciano D'Adamio, Department of Microbiology and Immunology, Einstein College of Medicine, Bronx, New York, NY 10461, USA. Tel.: +1 718 430 3244; fax: +1 718 430 8711; e-mail: [email protected]

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First published: 30 September 2012
Citations: 33

Summary

Processing of Aβ-precursor protein (APP) plays an important role in Alzheimer's disease (AD) pathogenesis. The APP intracellular domain contains residues important in regulating APP function and processing, in particular the 682YENPTY687 motif. To dissect the functions of this sequence in vivo, we created an APP knock-in allele mutating Y682 to Gly (APPYG/YG mice). This mutation alters the processing of APP and TrkA signaling and leads to postnatal lethality and neuromuscular synapse defects when expressed on an APP-like protein 2 KO background. This evidence prompted us to characterize further the APPYG/YG mice. Here, we show that APPYG/YG mice develop aging-dependent decline in cognitive and neuromuscular functions, a progressive reduction in dendritic spines, cholinergic tone, and TrkA levels in brain regions governing cognitive and motor functions. These data are consistent with our previous findings linking NGF and APP signaling and suggest a causal relationship between altered synaptic connectivity, cholinergic tone depression and TrkA signaling deficit, and cognitive and neuromuscular decline in APPYG/YG mice. The profound deficits caused by the Y682 mutation underscore the biological importance of APP and indicate that APPYG/YG are a valuable mouse model to study APP functions in physiological and pathological processes.

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