Expression of the cytoplasmic nucleolin for post-transcriptional regulation of macrophage colony-stimulating factor mRNA in ovarian and breast cancer cells

Ho Hyung Woo, Sang C. Lee, Steven J. Gibson, Setsuko K. Chambers

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

The formation of the mRNP complex is a critical component of translational regulation and mRNA decay. Both the 5' and 3'UTRs of CSF-1 mRNA are involved in post-transcriptional regulation. In CSF-1 mRNA, a small hairpin loop structure is predicted to form at the extreme 5' end (2–21 nt) of the 5'UTR. Nucleolin binds the hairpin loop structure in the 5'UTR of CSF-1 mRNA and enhances translation, while removal of this hairpin loop nucleolin binding element dramatically represses translation. Thus in CSF-1 mRNA, the hairpin loop nucleolin binding element is critical for translational regulation. In addition, nucleolin interacts with the 3'UTR of CSF-1 mRNA and facilitates the miRISC formation which results in poly (A) tail shortening. The overexpression of nucleolin increases the association of CSF-1 mRNA containing short poly (A)n ≤ 26, with polyribosomes. Nucleolin both forms an mRNP complex with the eIF4G and CSF-1 mRNA, and is co-localized with the eIF4G in the cytoplasm further supporting nucleolin's role in translational regulation. The distinct foci formation of nucleolin in the cytoplasm of ovarian and breast cancer cells implicates the translational promoting role of nucleolin in these cancers.

Original languageEnglish (US)
Pages (from-to)337-348
Number of pages12
JournalBiochimica et Biophysica Acta - Gene Regulatory Mechanisms
Volume1860
Issue number3
DOIs
StatePublished - Mar 1 2017

Keywords

  • Cytoplasmic nucleolin
  • Deadenylation
  • Hairpin loop structure
  • Macrophage colony stimulating factor (CSF-1) mRNA
  • Translation
  • Untranslated regions
  • eIF4G

ASJC Scopus subject areas

  • Biophysics
  • Structural Biology
  • Biochemistry
  • Molecular Biology
  • Genetics

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