title: Involvement of microRNA in AU-rich element-mediated mRNA instability.
abstract: AU-rich elements (AREs) in the 3' untranslated region (UTR) of unstable mRNAs dictate their degradation. An RNAi-based screen performed in Drosophila S2 cells has revealed that Dicer1, Argonaute1 (Ago1) and Ago2, components involved in microRNA (miRNA) processing and function, are required for the rapid decay of mRNA containing AREs of tumor necrosis factor-alpha. The requirement for Dicer in the instability of ARE-containing mRNA (ARE-RNA) was confirmed in HeLa cells. We further observed that miR16, a human miRNA containing an UAAAUAUU sequence that is complementary to the ARE sequence, is required for ARE-RNA turnover. The role of miR16 in ARE-RNA decay is sequence-specific and requires the ARE binding protein tristetraprolin (TTP). TTP does not directly bind to miR16 but interacts through association with Ago/eiF2C family members to complex with miR16 and assists in the targeting of ARE. miRNA targeting of ARE, therefore, appears to be an essential step in ARE-mediated mRNA degradation.
authors.affiliation: Department of Immunology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.
authors.forename: Qing
authors.initials: Q
authors.lastname: Jing
authors.forename: Shuang
authors.initials: S
authors.lastname: Huang
authors.forename: Sabine
authors.initials: S
authors.lastname: Guth
authors.forename: Tyler
authors.initials: T
authors.lastname: Zarubin
authors.forename: Andrea
authors.initials: A
authors.lastname: Motoyama
authors.forename: Jianming
authors.initials: J
authors.lastname: Chen
authors.forename: Franco
authors.initials: F
authors.lastname: Di Padova
authors.forename: Sheng-Cai
authors.initials: SC
authors.lastname: Lin
authors.forename: Hermann
authors.initials: H
authors.lastname: Gram
authors.forename: Jiahuai
authors.initials: J
authors.lastname: Han
mesh_terms: D020413:3' Untranslated Regions / Q000235:genetics*; D000818:Animals; D060565:Argonaute Proteins; D001483:Base Sequence / Q000235:genetics; D002460:Cell Line; D002467:Cell Nucleus / Q000235:genetics* / Q000378:metabolism; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism; D029721:Drosophila Proteins / Q000235:genetics / Q000378:metabolism; D004331:Drosophila melanogaster; D039642:Eukaryotic Initiation Factors; D005786:Gene Expression Regulation / Q000235:genetics; D006367:HeLa Cells; D006801:Humans; D017874:Immediate-Early Proteins / Q000235:genetics / Q000378:metabolism; D046911:Macromolecular Substances / Q000378:metabolism; D035683:MicroRNAs / Q000235:genetics*; D020871:RNA Stability / Q000235:genetics*; D012333:RNA, Messenger / Q000235:genetics* / Q000378:metabolism*; D034743:RNA-Induced Silencing Complex / Q000235:genetics / Q000378:metabolism; D043244:Ribonuclease III / Q000235:genetics / Q000378:metabolism; D051816:Tristetraprolin
chemical_list: D020413:3' Untranslated Regions; C489654:AGO1 protein, Drosophila; C433807:AGO2 protein, Drosophila; D060565:Argonaute Proteins; D004268:DNA-Binding Proteins; D029721:Drosophila Proteins; D039642:Eukaryotic Initiation Factors; D017874:Immediate-Early Proteins; D046911:Macromolecular Substances; D035683:MicroRNAs; D012333:RNA, Messenger; D034743:RNA-Induced Silencing Complex; D051816:Tristetraprolin; C497552:ZFP36 protein, human; D043244:Ribonuclease III