期刊
BRAIN AND BEHAVIOR
卷 2, 期 3, 页码 270-282出版社
WILEY
DOI: 10.1002/brb3.52
关键词
beta-Amyloid; beta-secretase; Alzheimer's disease; BACE1; lipid rafts; palmitoylation
资金
- Ministry of Education, Culture, Sports, Science, and Technology, Japan
- Ministry of Health, Labor, and Welfare, Japan
- Grants-in-Aid for Scientific Research [22590951, 24591249] Funding Source: KAKEN
beta-Secretase, BACE1 is a neuron-specific membrane-associated protease that cleaves amyloid precursor protein (APP) to generate beta-amyloid protein (A beta). BACE1 is partially localized in lipid rafts. We investigated whether lipid raft localization of BACE1 affects A beta production in neurons using a palmitoylation-deficient mutant and further analyzed the relationship between palmitoylation of BACE1 and its shedding and dimerization. We initially confirmed that BACE1 is mainly palmitoylated at four C-terminal cysteine residues in stably transfected neuroblastoma cells. We found that raft localization of mutant BACE1 lacking the palmitoylation modification was markedly reduced in comparison to wild-type BACE1 in neuroblastoma cells as well as rat primary cortical neurons expressing BACE1 via recombinant adenoviruses. In primary neurons, expression of wild-type and mutant BACE1 enhanced production of A beta from endogenous or overexpressed APP to similar extents with the beta-C-terminal fragment (beta-CTF) of APP mainly distributed in nonraft fractions. Similarly, beta-CTF was recovered mainly in nonraft fractions of neurons expressing Swedish mutant APP only. These results show that raft association of BACE1 does not influence beta-cleavage of APP and A beta production in neurons, and support the view that BACE1 cleaves APP mainly in nonraft domains. Thus, we propose a model of neuronal A beta generation involving mobilization of beta-CTF from nonraft to raft domains. Additionally, we obtained data indicating that palmitoylation plays a role in BACE1 shedding but not dimerization.
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