NDLI: MicroRNA-339-5p down-regulates protein expression of ß-site amyloid precursor protein-cleaving enzyme 1 (BACE1) in human primary brain cultures and is reduced in brain tissue specimens of Alzheimer disease subjects.

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MicroRNA-339-5p down-regulates protein expression of ß-site amyloid precursor protein-cleaving enzyme 1 (BACE1) in human primary brain cultures and is reduced in brain tissue specimens of Alzheimer disease subjects.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Ray, Balmiki Lahiri, Debomoy K. Long, Justin M.
Description	Author Affiliation: Long JM ( From the Laboratory of Molecular Neurogenetics, Institute of Psychiatric Research, Departments of Psychiatry and.)
Abstract	Alzheimer disease (AD) results, in part, from the excess accumulation of the amyloid-ß (Aß) peptide as neuritic plaques in the brain. The short Aß peptide is derived from the large transmembrane Aß precursor protein (APP). The rate-limiting step in the production of Aß from APP is mediated by the ß-site APP-cleaving enzyme 1 (BACE1). Dysregulation of BACE1 levels leading to excess Aß deposition is implicated in sporadic AD. Thus, elucidating the full complement of regulatory pathways that control BACE1 expression is key to identifying novel drug targets central to the Aß-generating process. MicroRNAs (miRNAs) are expected to participate in this molecular network. Here, we identified a known miRNA, miR-339-5p, as a key contributor to this regulatory network. Two distinct miR-339-5p target sites were predicted in the BACE1 3'-UTR by in silico analyses. Co-transfection of miR-339-5p with a BACE1 3'-UTR reporter construct resulted in significant reduction in reporter expression. Mutation of both target sites eliminated this effect. Delivery of the miR-339-5p mimic also significantly inhibited expression of BACE1 protein in human glioblastoma cells and human primary brain cultures. Delivery of target protectors designed against the miR-339-5p BACE1 3'-UTR target sites in primary human brain cultures significantly elevated BACE1 expression. Finally, miR-339-5p levels were found to be significantly reduced in brain specimens isolated from AD patients as compared with age-matched controls. Therefore, miR-339-5p regulates BACE1 expression in human brain cells and is most likely dysregulated in at least a subset of AD patients making this miRNA a novel drug target.
ISSN	00219258
e-ISSN	1083351X
Journal	Journal of Biological Chemistry
Issue Number	8
Volume Number	289
Language	English
Publisher	American Society for Biochemistry and Molecular Biology (United States)
Publisher Date	2014-02-21
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Alzheimer Disease Enzymology Genetics Amyloid Precursor Protein Secretases Aspartic Acid Endopeptidases Brain Pathology Down-Regulation MicroRNAs Metabolism 3' Untranslated Regions Amyloid Beta-Peptides Argonaute Proteins Cell Line, Tumor Cell Shape Cells, Cultured Computational Biology Conserved Sequence Demography Gene Knockdown Techniques Molecular Sequence Data Protein Binding Reproducibility Of Results Time Factors Research Support, N.I.H., Extramural Research Support, Non-U.S. Gov't Biochemistry Molecular Biology
Content Type	Text
Resource Type	Article
Subject	Cell Biology Biochemistry Molecular Biology

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