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Related Experiment Videos

Pretreatment with phorbol esters abrogates mast cell adenosine responsiveness.

D L Marquardt1, L L Walker

  • 1Department of Medicine, University of California San Diego Medical Center 92103.

Journal of Immunology (Baltimore, Md. : 1950)
|February 15, 1989
PubMed
Summary

Phorbol ester PMA exposure in mouse mast cells alters responses to adenosine. Short-term PMA enhances some responses, while long-term exposure causes adenosine hyporesponsiveness, impacting mediator release.

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Area of Science:

  • Immunology
  • Cell Biology
  • Pharmacology

Background:

  • Adenosine modulates mast cell mediator release.
  • Mast cells play a key role in allergic and inflammatory responses.

Purpose of the Study:

  • To investigate the effect of phorbol ester PMA on adenosine-mediated mast cell activation.
  • To understand the mechanisms underlying changes in mast cell responsiveness to adenosine.

Main Methods:

  • Mouse bone marrow-derived mast cells were cultured with phorbol ester PMA.
  • Stimulation with antigen (Ag) or calcium ionophore A23187 was performed.
  • Beta-hexosaminidase release, protein kinase C activity, and intracellular signaling (cAMP, calcium) were measured.

Main Results:

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  • Short-term PMA increased protein kinase C activity, inhibiting Ag-stimulated release but enhancing A23187-stimulated release.
  • Long-term PMA exposure decreased protein kinase C activity and led to adenosine hyporesponsiveness.
  • PMA affected adenosine's ability to increase cAMP and abrogated calcium influx.

Conclusions:

  • PMA exposure induces adenosine hyporesponsiveness in mast cells.
  • This hyporesponsiveness may involve direct effects on protein kinase C or adenosine receptor regulation.
  • Understanding these interactions is crucial for inflammatory disease research.