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Related Experiment Videos

Signal transduction through the sphingomyelin pathway

R Kolesnick1

  • 1Laboratory of Signal Transduction, Memorial Sloan-Kettering Cancer Center, New York, NY 10021.

Molecular and Chemical Neuropathology
|February 1, 1994
PubMed
Summary

The novel sphingomyelin pathway, activated by tumor necrosis factor (TNF) alpha, signals monocytic differentiation. This pathway involves ceramide production and a specific protein kinase, similar to established signaling systems.

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Signal Transduction

Background:

  • The sphingomyelin pathway is a newly identified signaling system.
  • It is initiated by the hydrolysis of sphingomyelin to ceramide.
  • Ceramide activates a serine/threonine protein kinase.

Purpose of the Study:

  • To investigate the role of the sphingomyelin pathway in cellular signaling.
  • To elucidate the mechanism of TNF alpha-induced monocytic differentiation.
  • To characterize the ceramide-activated protein kinase.

Main Methods:

  • Studied the kinetics of sphingomyelin pathway activation by TNF alpha.
  • Utilized cell-permeable ceramide analogs to mimic TNF alpha effects.
  • Reconstituted the signaling cascade in a cell-free system.

Main Results:

  • Demonstrated rapid activation of the sphingomyelin pathway by TNF alpha.
  • Confirmed that ceramide analogs can bypass receptor activation.
  • Established the sphingomyelin pathway's role in signaling TNF alpha-induced monocytic differentiation.

Conclusions:

  • The sphingomyelin pathway is a key signaling system for TNF alpha-induced monocytic differentiation.
  • This pathway involves ceramide production and activation of a specific protein kinase.
  • It represents a signaling system analogous to cyclic adenosine monophosphate and phosphoinositide pathways.

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