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ATF3 enhances c-Jun-mediated neurite sprouting.

Andree G Pearson1, Carol W Gray, John F Pearson

  • 1Department of Pharmacology and Clinical Pharmacology, The University of Auckland, Private Bag 92019, Auckland, New Zealand.

Brain Research. Molecular Brain Research
|December 12, 2003
PubMed
Summary
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The transcription factors c-Jun and ATF3 are crucial for axonal regeneration in neurons. Co-expression of c-Jun and ATF3 significantly enhances neurite sprouting, suggesting a coordinated role in nerve repair.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cell Biology

Background:

  • The AP-1 transcription factor c-Jun is upregulated in neurons after injury and linked to axonal regeneration.
  • Activating Transcription Factor 3 (ATF3), a related bZIP transcription factor, is also induced in neurons post-axotomy.
  • Increased ATF3 expression correlates with c-Jun upregulation, and c-Jun can induce ATF3 expression.

Purpose of the Study:

  • To investigate the combined effect of c-Jun and ATF3 on neuronal regeneration.
  • To model the transcriptional events in axotomized neurons undergoing regeneration using neuronal-like cell lines.

Main Methods:

  • Co-expression of c-Jun and ATF3 in two neuronal-like cell lines.
  • Analysis of neurite sprouting and transcriptional regulation.

Related Experiment Videos

Main Results:

  • Co-expression of ATF3 with c-Jun significantly enhanced c-Jun-mediated neurite sprouting.
  • This enhanced sprouting phenotype is likely mediated by a physical association between c-Jun and ATF3.
  • Results suggest a synergistic interaction between these transcription factors.

Conclusions:

  • A program for axonal regeneration is initiated when both c-Jun and ATF3 are upregulated in neurons following axotomy.
  • The physical association between c-Jun and ATF3 plays a key role in promoting nerve regeneration.