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Scientific article
Open access
English

Functionally diverse microRNA effector complexes are regulated by extracellular signaling

Published inMolecular cell, vol. 52, no. 1, p. 113-123
Publication date2013-10-10
First online date2013-09-19
Abstract

Because microRNAs (miRNAs) influence the expression of many genes in cells, discovering how the miRNA pathway is regulated is an important area of investigation. We found that the Drosophila miRNA-induced silencing complex (miRISC) exists in multiple forms. A constitutive form, called G-miRISC, is comprised of Ago1, miRNA, and GW182. Two distinct miRISC complexes that lack GW182 are regulated by mitogenic signaling. Exposure of cells to serum, lipids, or the tumor promoter PMA suppressed formation of these complexes. P-miRISC is comprised of Ago1, miRNA, and Loqs-PB, and it associates with mRNAs assembled into polysomes. The other regulated Ago1 complex associates with membranous organelles and is likely an intermediate in miRISC recycling. The formation of these complexes is correlated with a 5- to 10-fold stronger repression of target gene expression inside cells. Taken together, these results indicate that mitogenic signaling regulates the miRNA effector machinery to attenuate its repressive activities.

eng
Keywords
  • Animals
  • Argonaute Proteins / metabolism
  • Cell Line
  • Cell Membrane / metabolism
  • Drosophila Proteins / metabolism
  • Drosophila melanogaster
  • Gene Expression Regulation
  • Gene Silencing
  • Insulin / metabolism
  • Lipid Metabolism
  • MicroRNAs / genetics
  • MicroRNAs / metabolism
  • Mitogens / pharmacology
  • Polyribosomes / metabolism
  • RNA Interference
  • RNA-Binding Proteins / metabolism
  • RNA-Induced Silencing Complex / genetics
  • RNA-Induced Silencing Complex / metabolism
  • Serum / metabolism
  • Signal Transduction / drug effects
  • Tetradecanoylphorbol Acetate / pharmacology
  • Time Factors
  • Transfection
Affiliation Not a UNIGE publication
Funding
  • NIGMS NIH HHS - [R01 GM068743]
  • NIGMS NIH HHS - [GM068743]
  • NCI NIH HHS - [P30 CA060553]
  • NIGMS NIH HHS - [GM077581]
  • NIGMS NIH HHS - [R01 GM077581]
Citation (ISO format)
WU, Pei-Hsuan, ISAJI, Mamiko, CARTHEW, Richard W. Functionally diverse microRNA effector complexes are regulated by extracellular signaling. In: Molecular cell, 2013, vol. 52, n° 1, p. 113–123. doi: 10.1016/j.molcel.2013.08.023
Main files (2)
Article (Accepted version)
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Article (Published version)
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Secondary files (1)
Identifiers
ISSN of the journal1097-2765
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