Translation of the Alzheimer amyloid precursor protein mRNA is up-regulated by interleukin-1 through 5′-untranslated region sequences

被引:256
作者
Rogers, JT
Leiter, LM
McPhee, J
Cahill, CM
Zhan, SS
Potter, H
Nilsson, LNG
机构
[1] Harvard Univ, Sch Med, Brigham & Womens Hosp, Dept Med,Div Hematol, Boston, MA 02115 USA
[2] Massachusetts Gen Hosp, Dept Med, Diabet Unit, Boston, MA 02114 USA
[3] Univ S Florida, Dept Biochem & Mol Biol, Tampa, FL 33612 USA
[4] Univ S Florida, Suncoast Gerontol Ctr, Tampa, FL 33612 USA
关键词
D O I
10.1074/jbc.274.10.6421
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The amyloid precursor protein (APP) has been associated with Alzheimer's disease (AD) because APP is processed into the beta-peptide that accumulates in amyloid plaques, and APP gene mutations can cause early onset AD. Inflammation is also associated with AD as exemplified by increased expression of interleukin-l (IL-1) in microglia in affected areas of the AD brain. Here we demonstrate that IL-1 alpha and IL-beta increase APP synthesis by up to 6-fold in primary human astrocytes and by 15-fold in human astrocytoma cells without changing the steady-state levels of APP mRNA. A 90-nucleotide sequence in the APP gene 5'-untranslated region (5'-UTR) conferred translational regulation by IL-l alpha and IL-1 beta to a chloramphenicol acetyltransferase (CAT) reporter gene. Steady-state levels of transfected APP(5'-UTR)/CAT mRNAs were unchanged, whereas both baseline and IL-l-dependent CAT protein synthesis were increased. This APP mRNA translational enhancer maps from +55 to +144 nucleotides from the 5'-cap site and is homologous to related translational control elements in the 5'-UTR of the light and and heavy ferritin genes. Enhanced translation of APP mRNA provides a mechanism by which IL-1 influences the pathogenesis of AD.
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收藏
页码:6421 / 6431
页数:11
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