References
Query Results -- Details
MGI Accession ID: MGI:3821455
J Number: J:142399
Other Accession IDs:
Title: Loss of gamma-secretase function impairs endocytosis of lipoprotein particles and membrane cholesterol homeostasis.
Authors: Tamboli IY; Prager K; Thal DR; Thelen KM; Dewachter I; Pietrzik CU; St George-Hyslop P; Sisodia SS; De Strooper B; Heneka MT; Filippov MA; Muller U; van Leuven F; Lutjohann D; Walter J
Journal: J Neurosci
Volume: 28
Issue: 46
Date: 2008 Nov 12
Year: 2008
Pages: 12097-106
Review Status: Peer Reviewed
Abstract:
Presenilins (PSs) are components of the gamma-secretase complex that mediates intramembranous cleavage of type I membrane proteins. We show that gamma-secretase is involved in the regulation of cellular lipoprotein uptake. Loss of gamma-secretase function decreased endocytosis of low-density lipoprotein (LDL) receptor. The decreased uptake of lipoproteins led to upregulation of cellular cholesterol biosynthesis by increased expression of CYP51 and enhanced metabolism of lanosterol. Genetic deletion of PS1 or transgenic expression of PS1 mutants that cause early-onset Alzheimer's disease led to accumulation of gamma-secretase substrates and mistargeting of adaptor proteins that regulate endocytosis of the LDL receptor. Consistent with decreased endocytosis of these receptors, PS1 mutant mice have elevated levels of apolipoprotein E in the brain. Thus, these data demonstrate a functional link between two major genetic factors that cause early-onset and late-onset Alzheimer's disease.
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