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Related Experiment Videos

Membrane-phorbol ester interactions monitored by circular dichroism.

F Frézard1, A Garnier-Suillerot, J Bolard

  • 1Laboratoire de Chimie Bioinorganique (UA CNRS 198), UFR Biomédicale, Université Paris Nord, Bobigny, France.

Biochimica Et Biophysica Acta
|March 13, 1989
PubMed
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Phorbol esters like TPA and RPA interact with cell membranes, with some embedding observed. This suggests membrane insertion may not be essential for protein kinase C activation.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Biophysics

Background:

  • Phorbol esters are known activators of protein kinase C (PKC).
  • Understanding the interaction of phorbol esters with cell membranes is crucial for elucidating PKC activation mechanisms.
  • L-alpha-phosphatidylserine-containing vesicles and erythrocyte ghosts serve as model membrane systems.

Purpose of the Study:

  • To investigate the interaction of specific phorbol esters (PDBu, RPA, TPA) with model cell membranes.
  • To determine if phorbol ester interaction with membranes is a prerequisite for PKC activation.

Main Methods:

  • Circular dichroism (CD) spectroscopy was employed to monitor molecular interactions.
  • Small unilamellar vesicles and erythrocyte ghosts were used as membrane models.

Related Experiment Videos

  • Incubation of phorbol esters with cells at a concentration of 10(8) cells/ml was performed.

    • Main Results:

    • Phorbol 12,13-dibutyrate (PDBu) showed no spectral changes upon interaction with membranes.
    • 12-O-retinoylphorbol 13-acetate (RPA) and 12-O-tetradecanoylphorbol 13-acetate (TPA) spectra were altered, indicating membrane bilayer embedding.
    • Approximately 2-5% of added phorbol ester was embedded in the membrane within one minute.

    Conclusions:

    • Membrane embedding of phorbol esters might not be a necessary step for protein kinase C activation.
    • The quantity of phorbol esters required for PKC activation could be significantly small.
    • Differential membrane interaction observed among phorbol esters warrants further investigation.