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Related Experiment Videos

Thrombin (PAR-1)-induced proliferation in astrocytes via MAPK involves multiple signaling pathways.

Hong Wang1, Joachim J Ubl, Rolf Stricker

  • 1Otto-von-Guericke-Universität Magdeburg, Medizinische Fakultät, Institut für Neurobiochemie, 39120 Magdeburg, Germany.

American Journal of Physiology. Cell Physiology
|October 10, 2002
PubMed
Summary

Protease-activated receptors (PARs) activate astrocyte proliferation via the ERK pathway. Thrombin primarily uses PAR-1, with signaling independent of EGF receptor transactivation, revealing key astrocyte growth mechanisms.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Biochemistry

Background:

  • Protease-activated receptors (PARs) are G protein-coupled receptors found throughout the brain.
  • Thrombin activates PARs (PAR-1, -3, -4), influencing various cellular functions.
  • Astrocyte proliferation is crucial for brain development and repair.

Purpose of the Study:

  • To investigate the signaling pathways mediating thrombin- and PAR-activating peptide (PAR-AP)-induced astrocyte proliferation.
  • To elucidate the specific PARs involved in thrombin-induced astrocyte ERK activation and proliferation.
  • To determine the role of the epidermal growth factor (EGF) receptor in PAR-mediated astrocyte signaling.

Main Methods:

  • Primary rat astrocyte cultures were treated with thrombin or specific PAR-APs.

Related Experiment Videos

  • ERK1/2 phosphorylation was measured to assess pathway activation.
  • Inhibitors for EGF receptor (AG1478) and signaling pathways (PTX, U73122) were used.
  • EGF receptor autophosphorylation at tyrosine 1068 was analyzed.

    • Main Results:

    • PAR activation significantly stimulates astrocyte proliferation through the ERK pathway.
    • Thrombin-induced ERK1/2 phosphorylation is primarily mediated by PAR-1, with minor contributions from PAR-3 and PAR-4.
    • PAR-1 signaling involves PTX-sensitive G protein/(betagamma-subunits)-PI3K and G(q)-PLC-Ca2+-PKC pathways.
    • EGF receptor transactivation is not involved in thrombin- or PAR-1-induced ERK activation or proliferation.

    Conclusions:

    • Astrocyte proliferation induced by thrombin is mediated by PAR-1 activation and subsequent ERK signaling.
    • The signaling cascade involves distinct G protein pathways but is independent of EGF receptor transactivation.
    • These findings clarify the molecular mechanisms underlying thrombin's mitogenic effects on astrocytes.