Presenilin 1 phosphorylation regulates amyloid-β degradation by microglia.

TitlePresenilin 1 phosphorylation regulates amyloid-β degradation by microglia.
Publication TypeJournal Article
Year of Publication2021
AuthorsLedo, JHenrique, Liebmann, T, Zhang, R, Chang, JC, Azevedo, EP, Wong, E, Silva, HMoura, Troyanskaya, OG, Bustos, V, Greengard, P
JournalMol Psychiatry
Date Published2021 10
KeywordsAlzheimer Disease, Amyloid beta-Peptides, Amyloid beta-Protein Precursor, Amyloid Precursor Protein Secretases, Animals, Mice, Microglia, Phosphorylation, Presenilin-1

<p>Amyloid-β peptide (Aβ) accumulation in the brain is a hallmark of Alzheimer's Disease. An important mechanism of Aβ clearance in the brain is uptake and degradation by microglia. Presenilin 1 (PS1) is the catalytic subunit of γ-secretase, an enzyme complex responsible for the maturation of multiple substrates, such as Aβ. Although PS1 has been extensively studied in neurons, the role of PS1 in microglia is incompletely understood. Here we report that microglia containing phospho-deficient mutant PS1 display a slower kinetic response to micro injury in the brain in vivo and the inability to degrade Aβ oligomers due to a phagolysosome dysfunction. An Alzheimer's mouse model containing phospho-deficient PS1 show severe Aβ accumulation in microglia as well as the postsynaptic protein PSD95. Our results demonstrate a novel mechanism by which PS1 modulates microglial function and contributes to Alzheimer's -associated phenotypes.</p>

Alternate JournalMol Psychiatry
PubMed ID32792660
PubMed Central IDPMC7881060
Grant ListP30 CA008748 / CA / NCI NIH HHS / United States
R01 GM071966 / GM / NIGMS NIH HHS / United States