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2017 ; 10
(ä): 63
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APP Function and Lipids: A Bidirectional Link
#MMPMID28344547
Grimm MO
; Mett J
; Grimm HS
; Hartmann T
Front Mol Neurosci
2017[]; 10
(ä): 63
PMID28344547
show ga
Extracellular neuritic plaques, composed of aggregated amyloid-? (A?) peptides,
are one of the major histopathological hallmarks of Alzheimer's disease (AD), a
progressive, irreversible neurodegenerative disorder and the most common cause of
dementia in the elderly. One of the most prominent risk factor for sporadic AD,
carrying one or two aberrant copies of the apolipoprotein E (ApoE) ?4 alleles,
closely links AD to lipids. Further, several lipid classes and fatty acids have
been reported to be changed in the brain of AD-affected individuals.
Interestingly, the observed lipid changes in the brain seem not only to be a
consequence of the disease but also modulate A? generation. In line with these
observations, protective lipids being able to decrease A? generation and also
potential negative lipids in respect to AD were identified. Mechanistically, A?
peptides are generated by sequential proteolytic processing of the amyloid
precursor protein (APP) by ?- and ?-secretase. The ?-secretase appears to compete
with ?-secretase for the initial cleavage of APP, preventing A? production. All
APP-cleaving secretases as well as APP are transmembrane proteins, further
illustrating the impact of lipids on A? generation. Beside the pathological
impact of A?, accumulating evidence suggests that A? and the APP intracellular
domain (AICD) play an important role in regulating lipid homeostasis, either by
direct effects or by affecting gene expression or protein stability of enzymes
involved in the de novo synthesis of different lipid classes. This review
summarizes the current literature addressing the complex bidirectional link
between lipids and AD and APP processing including lipid alterations found in AD
post mortem brains, lipids that alter APP processing and the physiological
functions of A? and AICD in the regulation of several lipid metabolism pathways.