期刊
JOURNAL OF NEUROCHEMISTRY
卷 135, 期 3, 页码 606-615出版社
WILEY
DOI: 10.1111/jnc.13287
关键词
Alzheimer Disease; APP processing; nerve terminals; secretases; synapse; trafficking
资金
- Karolinska Institutet Strategic Neuroscience Program
- Swedish Brain Power Program
- Sheikha Salama bint Hamdan Al Nahayan Foundation
- Alzhemier's Association [NIRG-12-237941]
- Alzheimerfonden
- Demensfonden
- Knut och Alice Wallenbergs stiftelse
- Gun och Bertil Stohnes stiftelse
- Stiftelsen for Gamla Tjanarinnor
Synaptic degeneration and accumulation of the neurotoxic amyloid -peptide (A) in the brain are hallmarks of Alzheimer disease. A is produced by sequential cleavage of the amyloid precursor protein (APP), by the -secretase -site APP cleaving enzyme 1 (BACE1) and -secretase. However, A generation is precluded if APP is cleaved by the -secretase ADAM10 instead of BACE1. We have previously shown that A can be produced locally at the synapse. To study the synaptic localization of the APP processing enzymes we used western blotting to demonstrate that, compared to total brain homogenate, ADAM10 and BACE1 were greatly enriched in synaptic vesicles isolated from rat brain using controlled-pore glass chromatography, whereas Presenilin1 was the only enriched component of the -secretase complex. Moreover, we detected ADAM10 activity in synaptic vesicles and enrichment of the intermediate APP-C-terminal fragments (APP-CTFs). We confirmed the western blotting findings using insitu proximity ligation assay to demonstrate close proximity of ADAM10 and BACE1 with the synaptic vesicle marker synaptophysin in intact mouse primary hippocampal neurons. In contrast, only sparse co-localization of active -secretase and synaptophysin was detected. These results indicate that the first step of APP processing occurs in synaptic vesicles whereas the final step is more likely to take place elsewhere.
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