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Related Experiment Videos

PAF-acether (PAF) in Ehrlich ascites tumour cells.

G K Marathe1, T P Krishnakanta, C J D'Souza

  • 1Department of Studies in Biochemistry, Manasagangothri, University of Mysore, India.

Journal of Lipid Mediators
|September 1, 1990
PubMed
Summary

Ehrlich ascites tumor cells produce platelet-activating factor (PAF) when stimulated. This substance, identified as PAF-acether, aggregates human platelets, with activity increasing upon ionophore stimulation.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Immunology

Background:

  • Platelet aggregation is a critical process in hemostasis and thrombosis.
  • Platelet-activating factor (PAF) is a potent lipid mediator involved in various inflammatory and immune responses.
  • Ehrlich ascites tumor cells are a model system for studying cellular responses.

Purpose of the Study:

  • To investigate the production of PAF-acether by Ehrlich ascites tumor cells.
  • To characterize the platelet-aggregating properties of substances derived from these cells.
  • To determine the effect of calcium ionophore stimulation on PAF-acether production.

Main Methods:

  • Stimulation of Ehrlich ascites tumor cells with calcium ionophore A23187.
  • Extraction and purification of the PAF-acether fraction.
  • Assay of platelet aggregation.
  • Chemical modification (alkaline methanolysis and acetylation) of phosphatidylcholine fractions.

Main Results:

  • Stimulation of Ehrlich ascites tumor cells with A23187 led to the production of a platelet-aggregating substance.
  • The platelet aggregating ability was dose- and time-dependent, peaking at 10 microM A23187 within 30 minutes.
  • A semisynthetic preparation from unstimulated cells, identical in properties to authentic PAF-acether, also induced platelet aggregation.

Conclusions:

  • Ehrlich ascites tumor cells produce PAF-acether.
  • Ionophore stimulation enhances PAF-acether production in these cells.
  • The findings contribute to understanding PAF-acether biosynthesis and its role in cellular responses.

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