Related Experiment Videos

Linking extracellular survival signals and the apoptotic machinery

G Nuñez1, L del Peso

  • 1Department of Pathology and Comprehensive Cancer Center, University of Michigan Medical School, Ann Arbor 48109, USA. Gabriel.Nunez@umich.edu

Current Opinion in Neurobiology
|November 13, 1998
PubMed

Insights

Cell survival in multicellular organisms depends on external signals. The Akt signaling pathway links these signals to the apoptotic machinery by acting on the BAD protein.

Area of Science:

  • Cell biology
  • Molecular signaling
  • Apoptosis

Background:

  • Multicellular organism survival relies on continuous extracellular stimulation.
  • The phosphatidylinositol-3' kinase/Akt signaling cascade is crucial for transmitting survival signals.
  • Understanding how extracellular signals influence cell fate is vital.

Purpose of the Study:

  • To elucidate the role of the Akt signaling pathway in cellular survival.
  • To identify the molecular links between extracellular survival signals and apoptosis regulation.
  • To investigate the interaction between Akt and the pro-apoptotic protein BAD.

Main Methods:

  • Investigated the phosphatidylinositol-3' kinase/Akt signaling cascade.
  • Examined the role of Akt/PKB as a kinase.
  • Identified the pro-apoptotic protein BAD as a substrate of Akt/PKB.

Main Results:

  • The Akt signaling cascade is a critical pathway for survival signal transduction.
  • The pro-apoptotic protein BAD is a direct substrate of Akt/PKB.
  • This represents the first identified link between extracellular survival signals and the apoptotic machinery.

Conclusions:

  • The Akt pathway mediates extracellular survival signals.
  • Phosphorylation of BAD by Akt inhibits its pro-apoptotic function, promoting cell survival.
  • This finding provides a key molecular mechanism for how cells receive and respond to survival cues.

Related Concept Videos