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Related Experiment Videos

Interactions between second messenger pathways influence NGF synthesis in mouse primary astrocytes

F Jehan1, I Neveu, P Naveilhan

  • 1Institut National de la Santé et de la Recherche Médicale, Centre Hospitalier Régional Universitaire, Angers, France.

Brain Research
|February 20, 1995
PubMed
Summary

This study reveals that while phorbol 12-myristate 13-acetate (PMA) and serum increase nerve growth factor (NGF) gene expression in astrocytes, c-Jun protein plays a key regulatory role. Other signaling pathways modulate this complex NGF synthesis regulation.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cell Signaling

Background:

  • Astrocytes play crucial roles in neuronal support and function.
  • Nerve growth factor (NGF) is vital for neuronal survival and differentiation.
  • Proto-oncogenes like Fos and Jun are involved in cellular responses to stimuli.

Purpose of the Study:

  • To investigate how distinct signaling pathways affect nerve growth factor (NGF) gene expression in primary mouse brain astrocytes.
  • To examine the role of proto-oncogenes (Fos and Jun families) in regulating NGF gene expression.
  • To elucidate the complex regulatory mechanisms of NGF synthesis in astrocytes.

Main Methods:

  • Primary mouse brain astrocytes were stimulated with phorbol 12-myristate 13-acetate (PMA), serum, forskolin, and ionophore A23187.

Related Experiment Videos

  • Gene expression levels of NGF and proto-oncogenes (c-fos, fos-B, fra-1, jun-B, c-jun) were analyzed.
  • Cell-secreted NGF levels were measured following various treatments.

    • Main Results:

    • PMA and serum significantly induced NGF transcript accumulation.
    • c-Jun transcript levels correlated with NGF transcript levels, suggesting a regulatory role.
    • Forskolin and ionophore A23187 pretreatment interfered with PMA/serum-induced NGF expression and secretion.
    • Ionophore A23187 and thapsigargin inhibited mature NGF production.

    Conclusions:

    • The c-Jun protein appears to regulate NGF gene expression in astrocytes.
    • NGF synthesis regulation in astrocytes is complex, involving crosstalk between signaling pathways.
    • Calcium signaling pathways significantly impact NGF production and secretion in astrocytes.