Temporal quantitative proteomics by iTRAQ 2D-LC-MS/MS and corresponding mRNA expression analysis identify post-transcriptional modulation of actin-cytoskeleton regulators during TGF-β-Lnduced epithelial-mesenchymal transition

  • Venkateshwar G. Keshamouni
  • , Pratik Jagtap
  • , George Michailidis
  • , John R. Strahler
  • , Rork Kuick
  • , Ajaya Kumar Reka
  • , Panagiotis Papoulias
  • , Rashml Krishnapuram
  • , Anjaiah Srirangam
  • , Theodore J. Standiford
  • , Philip C. Andrews
  • , Gilbert S. Omenn

Research output: Contribution to journalArticlepeer-review

88 Scopus citations

Abstract

To gain insights into how TGF-β regulates epithelial-mesenchymal transition (EMT), we assessed the time course of proteins and mRNAs during EMT by multiplex iTRAQ labeling and 2D-LC-MS/MS, and by hybridization, respectively. Temporal iTRAQ analysis identified 66 proteins as differentially expressed during EMT, including newly associated proteins calpain, fascin and macrophage-migration inhibitory factor (MIF). Comparing protein and mRNA expression overtime showed that all the 14 up-regulated proteins involved in the actin-cytoskeleton remodeling were accompanied by increases in corresponding mRNA expression. Interestingly, siRNA mediated knockdown of cofilinl potentiated TGFβ-induced EMT. Further analysis of cofilinl and β-actin revealed an increase in their mRNA stability in response to TGF-β, contributing to the observed increase in mRNA and protein expression. These results are the first demonstration of post-transcriptional regulation of cytoskeletal remodelling and a key role for cofilinl during TGF-β-induced EMT.

Original languageEnglish (US)
Pages (from-to)35-47
Number of pages13
JournalJournal of Proteome Research
Volume8
Issue number1
DOIs
StatePublished - Jan 2009

Keywords

  • Actin-cytoskeleton remodeling
  • Beta-actin
  • Calpain
  • Cofilin1
  • Epithelial-mesenchymal transition
  • Ezrin
  • ITRAQ
  • Lung cancer
  • Moesin
  • Qualitative proteomics
  • TGF-β

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