Genetic Variations in ABCA7 Can Increase Secreted Levels of Amyloid-β40 and Amyloid-β42 Peptides and ABCA7 Transcription in Cell Culture Models

被引:21
作者
Bamji-Mirza, Michelle [1 ,2 ]
Li, Yan [1 ,2 ]
Najem, Dema [1 ,2 ]
Liu, Qing Yan [2 ]
Walker, Douglas [3 ]
Lue, Lih-Fen [3 ]
Stupak, Jacek [2 ]
Chan, Kenneth [2 ]
Li, Jianjun [2 ]
Ghani, Mahdi [4 ]
Yang, Ze [5 ,6 ]
Rogaeva, Ekaterina [4 ]
Zhang, Wandong [1 ,2 ]
机构
[1] Univ Ottawa, Fac Med, Dept Pathol & Lab Med, Ottawa, ON, Canada
[2] Natl Res Council Canada, Div Life Sci, Human Hlth Therapeut Portfolio, Ottawa, ON, Canada
[3] Banner Sun Hlth Res Inst, Sun City, AZ USA
[4] Univ Toronto, Tanz Ctr Res Neurodegenerat Dis, Toronto, ON, Canada
[5] Beijing Hosp, Key Lab Geriatr, Beijing, Peoples R China
[6] Chinese Minist Hlth, Beijing Inst Geriatr, Beijing, Peoples R China
关键词
ABC transporters; ABCA7; protein; Alzheimer's disease; amyloid beta-peptides; BACE1; genome-wide association study; myristoylation; SNPs; AMYLOID PRECURSOR PROTEIN; GENOME-WIDE ASSOCIATION; ALZHEIMERS-DISEASE; IDENTIFIES VARIANTS; CHOLESTEROL EFFLUX; TRANSPORTER ABCA7; COMMON VARIANTS; BETA; CLU; MYRISTOYLATION;
D O I
10.3233/JAD-150965
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
Alzheimer's disease (AD) is characterized by extracellular deposits of amyloid-beta (A beta) in the brain. ABCA7 is highly expressed in the brain and a susceptibility gene for late-onset AD (LOAD). The minor alleles at two ABCA7 single-nucleotide polymorphisms (SNPs), rs3764650 (T>G; intron13) and rs3752246 at a predicted myristoylation site (C>G; exon33; p. Gly1527Ala), are significantly associated with LOAD risk; however, the mechanism of this association is unknown. Functional consequences of both SNPs were examined in HEK293 and CHO cells stably expressing A beta PPSwe. Luciferase reporter assays in HEK293 cells suggested that intron13 carrying rs3764650 major T-allele (int13-T) possessed promoter-enhancing capabilities. Co-transfection experiments with hABCA7 and int13-T resulted in significantly increased ABCA7 protein level relative to that with int13-G. Expression of hABCA7 carrying rs3752246 risk allele led to increases in secreted A beta(40) and A beta(42) and beta-secretase activity in CHO-and HEK-A beta PPSwe cells. Hydroxymyristic acid treatment of cells expressing hABCA7 carrying the rs3752246 major G allele resulted in increased beta-secretase activity and levels of A beta, suggesting that lack of myristoylation contributes to the observed cell-phenotypes. Molecular weight determination, by gel-electrophoresis and mass spectrometry, of hABCA7 peptides spanning position 1527 showed loss of post-translational modification in the risk-allele peptide. These results suggest that decreased expression, or impaired function, of ABCA7 may contribute to AD pathology.
引用
收藏
页码:875 / 892
页数:18
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