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Related Experiment Videos

Ras, superoxide and signal transduction.

K Irani1, P J Goldschmidt-Clermont

  • 1Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.

Biochemical Pharmacology
|March 17, 1999
PubMed
Summary

Superoxide anion, produced by NADPH oxidase, not only kills bacteria but also acts as a signal messenger in cells. This dual role offers new targets for treating Ras-driven cancers.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Immunology

Background:

  • Superoxide anion is generated by NADPH oxidase in phagocytes for bactericidal activity.
  • NADPH oxidase activity is regulated by Rac, a Ras family GTP-binding protein.
  • Emerging evidence suggests superoxide functions beyond bacterial killing.

Purpose of the Study:

  • To explore the signaling role of superoxide anion in nonphagocytic cells.
  • To investigate the involvement of superoxide in Ras-mediated cellular processes.
  • To establish an analogy between superoxide and nitric oxide (NO) signaling.

Main Methods:

  • The abstract does not specify methods.

Main Results:

  • Superoxide anion acts as a signal-transduction messenger, mediating downstream effects of Ras and Rac in nonphagocytic cells.
  • Superoxide contributes to the proliferation of Ras-transformed cells.
  • Low concentrations of oxidants like superoxide may act as messengers, while higher concentrations cause damage.

Conclusions:

  • Superoxide's dual role as a bactericidal agent and signaling messenger is highlighted.
  • The signaling capacity of oxidants opens new therapeutic strategies for Ras-mediated diseases.
  • Pharmacological interventions targeting Ras-mediated pathways are a promising avenue.

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