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Long-term Live-cell Imaging to Assess Cell Fate in Response to Paclitaxel
08:29

Long-term Live-cell Imaging to Assess Cell Fate in Response to Paclitaxel

Published on: May 14, 2018

Phosphorylation of human eukaryotic elongation factor 1Bgamma is regulated by paclitaxel

Miguel A Prado1, Pedro Casado, Pedro Zuazua-Villar

  • 1Departamento de Bioquímica y Biología Molecular, Instituto Universitario de Oncología del Principado de Asturias, Universidad de Oviedo, Oviedo, Spain.

Proteomics
|August 22, 2007
PubMed

Insights

Paclitaxel (Ptx) cancer drug alters eukaryotic elongation factor 1Bgamma (eEF1Bgamma) by regulating its phosphorylation. This Ptx-induced modification impacts eEF1Bgamma activity, offering new insights into cancer drug mechanisms.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Pharmacology

Background:

  • Paclitaxel (Ptx) is a chemotherapy agent that disrupts microtubule dynamics, leading to cell cycle arrest and apoptosis.
  • The precise molecular mechanisms underlying Ptx's effects, particularly post-translational modifications of key proteins, require further elucidation.

Purpose of the Study:

  • To investigate the effect of Paclitaxel on eukaryotic elongation factor 1Bgamma (eEF1Bgamma) in HeLa cells.
  • To determine if Paclitaxel induces post-translational modifications (PTMs) of eEF1Bgamma.

Main Methods:

  • Two-dimensional polyacrylamide gel electrophoresis (2-D PAGE) and MALDI-TOF-MS were used to analyze protein expression changes.
  • Phosphospecific staining with PRO-Q Diamond and treatment with protein phosphatase were employed to assess phosphorylation status.

Main Results:

  • Paclitaxel treatment resulted in the up-regulation of one eEF1Bgamma form and down-regulation of another, without altering overall mRNA or protein levels.
  • Phosphospecific staining confirmed that the up-regulated eEF1Bgamma form is phosphorylated.
  • Dephosphorylation by protein phosphatase abolished the Ptx-up-regulated eEF1Bgamma form.

Conclusions:

  • Paclitaxel regulates human eEF1Bgamma through phosphorylation.
  • This study demonstrates Ptx-mediated phosphorylation of eEF1Bgamma as a key post-translational modification impacting its function.

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