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Related Experiment Videos

Sphingomyelin breakdown and cell fate

R Testi1

  • 1Department of Experimental Medicine and Biochemical Sciences, University of Rome Tor Vergata, Italy. tesrob@flashnet.it

Trends in Biochemical Sciences
|December 1, 1996
PubMed
Summary

Cell surface receptors trigger sphingomyelin hydrolysis, releasing ceramides. These ceramides act as signaling mediators, influencing cell proliferation, differentiation, growth arrest, and apoptosis depending on cellular context.

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Area of Science:

  • Cellular signaling pathways
  • Biochemistry of lipids
  • Receptor-mediated events

Background:

  • Cell-surface receptors increasingly recognized for signaling roles.
  • Sphingomyelin hydrolysis releases bioactive ceramides.
  • Ceramides are implicated in diverse cellular processes.

Purpose of the Study:

  • To elucidate the role of cell-surface receptor-mediated sphingomyelin hydrolysis.
  • To understand the signaling functions of released ceramides.
  • To investigate factors influencing ceramide-mediated cellular outcomes.

Main Methods:

  • Analysis of cell-surface receptor activation.
  • Biochemical assays for sphingomyelin hydrolysis.
  • Measurement of ceramide levels and localization.
  • Cellular response assays (proliferation, apoptosis, differentiation).

Main Results:

  • Specific cell-surface receptors initiate sphingomyelin hydrolysis.
  • Diffusible ceramides are generated as second messengers.
  • Ceramide signaling impacts cell proliferation, differentiation, growth arrest, and apoptosis.
  • Cellular context, including signal integration and subcellular localization, dictates ceramide-mediated outcomes.

Conclusions:

  • Cell-surface receptor signaling converges on sphingomyelin hydrolysis to produce ceramides.
  • Ceramides are versatile mediators of cell fate.
  • The biological outcome of ceramide signaling is highly context-dependent.

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