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GAS1 induces cell death through an intrinsic apoptotic pathway

Natanael Zarco1, Ricardo González-Ramírez, Rosa O González

  • 1Departamento de Fisiología, Biofísica y Neurociencias, Centro de Investigación y de Estudios Avanzados del IPN, Av. Instituto Politécnico Nacional # 2508, Mexico, D.F, Mexico.

Apoptosis : an International Journal on Programmed Cell Death
|February 8, 2012
PubMed

Insights

Growth Arrest Specific 1 (GAS1) protein triggers apoptosis by inhibiting survival signals. Silencing GAS1 delays programmed cell death, revealing its crucial role in cell fate.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Neuroscience

Background:

  • Growth Arrest Specific 1 (GAS1) is a protein involved in cell cycle arrest and development.
  • Ectopic GAS1 expression induces cell arrest and apoptosis by inhibiting GDNF-mediated survival signaling.

Purpose of the Study:

  • To dissect the molecular pathway through which GAS1 induces apoptosis.
  • To investigate the role of GAS1 in the intrinsic apoptotic pathway in neuroblastoma cells.

Main Methods:

  • Utilized the SH-SY5Y human neuroblastoma cell line.
  • Analyzed protein phosphorylation (RET, AKT) and dephosphorylation (BAD).
  • Assessed Cytochrome-c release, caspase activation (caspase-9, caspase-3), and apoptosis onset.

Main Results:

  • GAS1 presence reduced RET phosphorylation and AKT activation.
  • GAS1 triggered BAD dephosphorylation, leading to Cytochrome-c release from mitochondria.
  • Activation of caspase-9 and caspase-3 resulted in apoptosis, consistent with an intrinsic pathway.
  • GAS1 silencing significantly delayed apoptosis onset.

Conclusions:

  • GAS1 induces apoptosis via the intrinsic pathway by inhibiting survival signaling and promoting mitochondrial release of Cytochrome-c.
  • GAS1 plays a critical role in regulating programmed cell death in neuroblastoma cells.
  • Targeting GAS1 may offer therapeutic strategies for conditions involving aberrant cell survival.

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