期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 111, 期 13, 页码 E1230-E1239出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1320192111
关键词
Golgi stacking; APP processing; GRASP55; amyloidogenic
资金
- National Institutes of Health [GM087364, P50 AG08761]
- American Cancer Society [RGS-09-278-01-CSM]
- University of Michigan Rackham faculty research grant
- MCubed and the Protein Folding Disease Initiative of the University of Michigan
Golgi fragmentation occurs in neurons of patients with Alzheimer's disease (AD), but the underlying molecular mechanism causing the defects and the subsequent effects on disease development remain unknown. In this study, we examined the Golgi structure in APPswe/PS1 Delta E9 transgenic mouse and tissue culture models. Our results show that accumulation of amyloid beta peptides (A beta) leads to Golgi fragmentation. Further biochemistry and cell biology studies revealed that Golgi fragmentation in AD is caused by phosphorylation of Golgi structural proteins, such as GRASP65, which is induced by A beta-triggered cyclin-dependent kinase-5 activation. Significantly, both inhibition of cyclin-dependent kinase-5 and expression of nonphosphorylatable GRASP65 mutants rescued the Golgi structure and reduced A beta secretion by elevating a-cleavage of the amyloid precursor protein. Our study demonstrates a molecular mechanism for Golgi fragmentation and its effects on amyloid precursor protein trafficking and processing in AD, suggesting Golgi as a potential drug target for AD treatment.
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