6533b82afe1ef96bd128b86f
RESEARCH PRODUCT
Expression of the Anti-amyloidogenic Secretase ADAM10 Is Suppressed by Its 5′-Untranslated Region*
Christian HaassSonja ZilowClaudia PrinzenAnn-katrin LudwigDominik BuellStefan F. LichtenthalerBrigitte NuscherSven LammichFalk Fahrenholzsubject
Five prime untranslated regionenzymology [Brain]ADAM10ADAM10 protein humanBACE1-ASgenetics [Amyloid Precursor Protein Secretases]genetics [Alzheimer Disease]genetics [ADAM Proteins]BiochemistryGene Expression Regulation Enzymologicbiosynthesis [Membrane Proteins]ADAM10 ProteinAlzheimer DiseaseChlorocebus aethiopsAmyloid precursor proteinProtein biosynthesisbiosynthesis [Amyloid beta-Peptides]genetics [Amyloid beta-Peptides]AnimalsHumansGene RegulationMolecular BiologySequence Deletionbiosynthesis [ADAM Proteins]Amyloid beta-PeptidesbiologyBase SequenceP3 peptideenzymology [Alzheimer Disease]BrainMembrane ProteinsCell BiologyMolecular biologyBiochemistry of Alzheimer's diseasegenetics [Membrane Proteins]ADAM Proteinsbiosynthesis [Amyloid Precursor Protein Secretases]Protein Biosynthesisddc:540COS Cellsbiology.proteinAmyloid Precursor Protein Secretases5' Untranslated RegionsAmyloid precursor protein secretasedescription
Proteolytic processing of the amyloid precursor protein by alpha-secretase prevents formation of the amyloid beta-peptide (Abeta), which is the main constituent of amyloid plaques in brains of Alzheimer disease (AD) patients. alpha-Secretase activity is decreased in AD, and overexpression of the alpha-secretase ADAM10 (a disintegrin and metalloprotease 10) in an AD animal model prevents amyloid pathology. ADAM10 has a 444-nucleotide-long, very GC-rich 5'-untranslated region (5'-UTR) with two upstream open reading frames. Because similar properties of 5'-UTRs are found in transcripts of many genes, which are regulated by translational control mechanisms, we asked whether ADAM10 expression is translationally controlled by its 5'-UTR. We demonstrate that the 5'-UTR of ADAM10 represses the rate of ADAM10 translation. In the absence of the 5'-UTR, we observed a significant increase of ADAM10 protein levels in HEK293 cells, whereas mRNA levels were not changed. Moreover, the 5'-UTR of ADAM10 inhibits translation of a luciferase reporter in an in vitro transcription/translation assay. Successive deletion of the first half of the ADAM10 5'-UTR revealed a striking increase in ADAM10 protein expression in HEK293 cells, suggesting that this part of the 5'-UTR contains inhibitory elements for translation. Moreover, we detect an enhanced alpha-secretase activity and consequently reduced Abeta levels in the conditioned medium of HEK293 cells expressing both amyloid precursor protein and a 5'-UTR-ADAM10 deletion construct lacking the first half of the 5'-UTR. Thus, we provide evidence that the 5'-UTR of ADAM10 may have an important role for post-transcriptional regulation of ADAM10 expression and consequently Abeta production.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2010-05-01 |