Identification of two novel synaptic γ-secretase associated proteins that affect amyloid β-peptide levels without altering Notch processing.

Abstract:

:Synaptic degeneration is one of the earliest hallmarks of Alzheimer disease (AD) and results in loss of cognitive function. One of the causative agents for the synaptic degeneration is the amyloid β-peptide (Aβ), which is formed from its precursor protein by two sequential cleavages mediated by β- and γ-secretase. We have earlier shown that γ-secretase activity is enriched in synaptic compartments, suggesting that the synaptotoxic Aβ is produced locally. Proteins that interact with γ-secretase at the synapse and regulate the production of Aβ can therefore be potential therapeutic targets. We used a recently developed affinity purification approach to identify γ-secretase associated proteins (GSAPs) in synaptic membranes and synaptic vesicles prepared from rat brain. Liquid chromatography-tandem mass spectrometry analysis of the affinity purified samples revealed the known γ-secretase components presenilin-1, nicastrin and Aph-1b along with a number of novel potential GSAPs. To investigate the effect of these GSAPs on APP processing, we performed siRNA experiments to knock down the expression of the GSAPs and measured the Aβ levels. Silencing of NADH dehydrogenase [ubiquinone] iron-sulfur protein 7 (NDUFS7) resulted in a decrease in Aβ levels whereas silencing of tubulin polymerization promoting protein (TPPP) resulted in an increase in Aβ levels. Treatment with γ-secretase inhibitors often results in Notch-related side effects and therefore we also studied the effect of the siRNAs on Notch processing. Interestingly, silencing of TPPP or NDUFS7 did not affect cleavage of Notch. We also studied the expression of TPPP and NDUFS7 in control and AD brain and found NDUFS7 to be highly expressed in vulnerable neurons such as pyramidal neurons in the hippocampus, whereas TPPP was found to accumulate in intraneuronal granules and fibrous structures in hippocampus from AD cases. In summary, we here report on two proteins, TPPP and NDUFS7, which interact with γ-secretase and alter the Aβ levels without affecting Notch cleavage.

journal_name

Neurochem Int

authors

Frykman S,Teranishi Y,Hur JY,Sandebring A,Yamamoto NG,Ancarcrona M,Nishimura T,Winblad B,Bogdanovic N,Schedin-Weiss S,Kihara T,Tjernberg LO

doi

10.1016/j.neuint.2012.03.016

subject

Has Abstract

pub_date

2012-07-01 00:00:00

pages

108-18

issue

1

eissn

0197-0186

issn

1872-9754

pii

S0197-0186(12)00118-0

journal_volume

61

pub_type

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