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Natural polyamines stimulate G-proteins.

J L Bueb1, A Da Silva, M Mousli

  • 1Laboratoire de Neuroimmunopharmacologie, Université Louis Pasteur-Strasbourg I, Illkirch, France.

The Biochemical Journal
|March 1, 1992
PubMed
Summary
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Natural polyamines like spermine and spermidine activate GTP-binding proteins (Go/Gi) and rat mast cells. This suggests polyamines may regulate cellular signaling pathways involving G-protein-coupled receptors.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Pharmacology

Background:

  • Polyamines are essential molecules involved in various cellular processes.
  • GTP-binding proteins (Go/Gi) are crucial for signal transduction.
  • Mast cells play a key role in allergic responses and inflammation.

Purpose of the Study:

  • To investigate the effect of natural polyamines and their analogues on GTPase activity of Go/Gi proteins.
  • To assess the physiological relevance of polyamine-stimulated signaling in rat mast cells.
  • To elucidate the signaling pathway involved in polyamine-mediated mast cell activation.

Main Methods:

  • Purification and reconstitution of GTP-binding proteins (Go/Gi) into phospholipid vesicles.
  • Assay of GTPase activity in response to polyamines.

Related Experiment Videos

  • Stimulation of peritoneal and tracheal rat mast cells with polyamines.
  • Inhibition studies using benzalkonium chloride and pertussis toxin.
  • Measurement of inositol phosphates.

    • Main Results:

    • Polyamines (spermine, spermidine, putrescine, cadaverine, tyramine) stimulated GTPase activity of Go/Gi proteins.
    • The order of potency was spermine > spermidine > putrescine = cadaverine > tyramine.
    • Rat mast cells showed the same order of potency for polyamine-induced stimulation.
    • Polyamine activation of mast cells and inositol phosphate increase were inhibited by pertussis toxin.

    Conclusions:

    • Intracellular polyamines can directly stimulate GTP-binding proteins (Go/Gi).
    • Polyamines modulate extracellular signals transduced through G-protein-coupled receptors.
    • Polyamines may control basal levels of second messengers in cells like mast cells.