Phosphorylation of the Human MicroRNA-Generating Complex Mediates MAPK/Erk Signaling

Zain Paroo, Xuecheng Ye, She Chen, Qinghua Liu

Research output: Contribution to journalArticle

259 Scopus citations

Abstract

MicroRNAs (miRNAs) govern an expanding number of biological and disease processes. Understanding the mechanisms by which the miRNA pathway is regulated, therefore, represents an important area of investigation. We determined that the human miRNA-generating complex is comprised of Dicer and phospho-TRBP isoforms. Phosphorylation of TRBP is mediated by the mitogen-activated protein kinase (MAPK) Erk. Expression of phospho-mimic TRBP and TRBP phosphorylation enhanced miRNA production by increasing stability of the miRNA-generating complex. Mitogenic signaling in response to serum and the tumor promoter PMA was dependent on TRBP phosphorylation. These effects were accompanied by a coordinated increase in levels of growth-promoting miRNA and reduced expression of let-7 tumor suppressor miRNA. Conversely, pharmacological inhibition of MAPK/Erk resulted in an anti-growth miRNA profile. Taken together, these studies indicate that the MAPK/Erk pathway regulates the miRNA machinery and suggest a general principle, wherein signaling systems target the miRNA pathway to achieve biological responses.

Original languageEnglish (US)
Pages (from-to)112-122
Number of pages11
JournalCell
Volume139
Issue number1
DOIs
StatePublished - Oct 2 2009

Keywords

  • CELLBIO
  • RNA
  • SIGNALING

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

Fingerprint Dive into the research topics of 'Phosphorylation of the Human MicroRNA-Generating Complex Mediates MAPK/Erk Signaling'. Together they form a unique fingerprint.

  • Cite this