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The mechanism and function of mitogen-activated protein kinase activation by ARF1

Fuguo Zhou1, Chunmin Dong1, Jason E Davis2

  • 1Department of Pharmacology and Experimental Therapeutics, Louisiana State University Health Sciences Center, 1901 Perdido St, New Orleans, LA 70112, United States.

Cellular Signalling
|July 15, 2015
PubMed

Insights

ADP-ribosylation factor 1 (ARF1) activates the MAPK pathway, likely using the Golgi apparatus. This signaling cascade promotes cell proliferation by activating cytoplasmic RSK1.

Area of Science:

  • Cellular signaling pathways
  • Molecular biology
  • Signal transduction

Background:

  • Mitogen-activated protein kinases (MAPK) are crucial in cellular processes.
  • G protein-coupled receptors initiate signaling cascades.
  • The Ras-like small GTPase ADP-ribosylation factor 1 (ARF1) has a newly identified role in MAPK activation.

Purpose of the Study:

  • To elucidate the mechanism of ARF1-mediated MAPK pathway activation.
  • To define the functional role of ARF1 in cellular processes.
  • To investigate the specific components and localization involved in ARF1 signaling.

Main Methods:

  • Site-directed mutagenesis of ARF1 (Thr48 and Gly2 residues).
  • Assessment of ARF1 localization to the Golgi apparatus.
  • Treatment with Golgi-disrupting agents.
  • Analysis of ERK1/2, RSK1, and Elk-1 activation.
  • Cell proliferation assays.

Main Results:

  • Mutations in ARF1's GDP/GTP exchange site (Thr48) and myristoylation site (Gly2) abolished ERK1/2 activation.
  • Disruption of Golgi structure attenuated ARF1-mediated ERK1/2 activation.
  • ARF1 significantly promoted cell proliferation.
  • ARF1 activated cytoplasmic RSK1 but not Elk-1 or nuclear ERK2 translocation.

Conclusions:

  • ARF1 activation of the MAPK pathway utilizes the Golgi apparatus as a platform.
  • ARF1-mediated signaling leads to cytoplasmic RSK1 activation, promoting cell proliferation.
  • ARF1 plays a significant role in regulating cell growth through the MAPK pathway.
Keywords:
ARF1Cell proliferationERK1/2G proteinG protein-coupled receptorMAPKRSK1

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