A pilot proteomic study of amyloid precursor interactors in Alzheimer's disease

• Published in: Annals of neurology 2005-08, Vol.58 (2), p.277-289
• Main Authors: Cottrell, Barbara A., Galvan, Veronica, Banwait, Surita, Gorostiza, Olivia, Lombardo, Christian R., Williams, Tristan, Schilling, Birgit, Peel, Alyson, Gibson, Bradford, Koo, Edward H., Link, Christopher D., Bredesen, Dale E.
• Format: Article
• Language: English
• Subjects: Alzheimer Disease - metabolism; Amyloid beta-Protein Precursor - chemistry; Amyloid beta-Protein Precursor - metabolism; Biological and medical sciences; Blotting, Western - methods; Brain - metabolism; Brain - pathology; Crystallins - metabolism; Degenerative and inherited degenerative diseases of the nervous system. Leukodystrophies. Prion diseases; Dynamins - metabolism; Electrophoresis, Gel, Two-Dimensional - methods; Headache. Facial pains. Syncopes. Epilepsia. Intracranial hypertension. Brain oedema. Cerebral palsy; Humans; Immunohistochemistry - methods; Immunoprecipitation - methods; Medical sciences; Nerve Tissue Proteins - metabolism; Nervous system (semeiology, syndromes); Neurology; Pilot Projects; Proteomics - methods
• ISSN: 0364-5134; 1531-8249
• DOI: 10.1002/ana.20554

Several approaches have been used in an effort to identify proteins that interact with β‐amyloid precursor protein (APP). However, few studies have addressed the identification of proteins associated with APP in brain tissue from patients with Alzheimer's disease. We report the results of a pilot proteomic study performed on complexes immunoprecipitated with APP in brain samples of patients with Alzheimer's disease and normal control subjects. The 21 proteins identified could be grouped into five functional classes: molecular chaperones, cytoskeletal and structural proteins, proteins involved in trafficking, adaptors, and enzymes. Among the proteins identified, six had been reported previously as direct, indirect, or genetically inferred APP interactors. The other 15 proteins immunoprecipitated with APP were novel potential partners. We confirmed the APP interaction by Western blotting and coimmunolocalization in brain tissues, for 5 of the 21 interactors. In agreement with previous studies, our results are compatible with an involvement of APP in axonal transport and vesicular trafficking, and with a potential association of APP with cellular protein folding/protein degradation systems. Ann Neurol 2005;58:277–289