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Internal cellular stress, such as cellular injury or hypoxia, triggers intrinsic apoptosis. The B-cell lymphoma 2 (Bcl-2) family of proteins are the primary regulators of the intrinsic apoptotic pathway. For example, during DNA damage, checkpoint proteins, such as Ataxia Telangiectasia Mutated (ATM protein) and Checkpoints Factor-2 (Chk2) proteins, are activated. These proteins phosphorylate p53 which further activates pro-apoptotic proteins, such as Bax, Bak, PUMA, and Noxa, and inhibits...
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A High-content Imaging Workflow to Study Grb2 Signaling Complexes by Expression Cloning
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Published on: October 30, 2012

A role for Grb2 in apoptosis?

I Rey1, I Fath, F Parker

  • 1RPR Gencell, Rhône-Poulenc-Rorer Central Research Centre de Recherche de Vitry-Alfortville, 13 quai jules Guesde-BP14 94403 Vitry Sur Seine Cedex, France.

Cell Death and Differentiation
|April 1, 1995
PubMed
Summary

Alternative splicing generates Grb3-3, a protein lacking a functional SH2 domain, which may induce apoptosis. This highlights how alternative splicing can dictate cell fate, promoting either proliferation or programmed cell death.

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Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Biochemistry

Background:

  • Src homology type 2 (SH2) and type 3 (SH3) domains are crucial for signal transduction pathways initiated by tyrosine kinases.
  • SH2 domains mediate interactions with tyrosine kinases and phosphorylated proteins, while SH3 domains bind proline-rich sequences.
  • The adaptor protein Grb2, containing SH2 and SH3 domains, links tyrosine kinase receptors to Ras pathway activation.

Purpose of the Study:

  • To document the mechanism of Grb3-3 function.
  • To discuss the putative involvement of Grb3-3 in several pathologies.
  • To strengthen the understanding of alternative splicing in cell fate determination.

Main Methods:

  • Review of existing literature on SH2/SH3 domain function.
  • Analysis of alternative splicing mechanisms in Grb2 gene.
  • Examination of cellular signaling pathways involving Grb3-3.

Main Results:

  • Grb3-3, an alternative splice variant of Grb2, lacks a functional SH2 domain but retains functional SH3 domains.
  • Evidence suggests Grb3-3 delivers specific signals that can induce apoptosis.
  • Alternative splicing can direct cells towards either proliferative or suicidal programs.

Conclusions:

  • Grb3-3 plays a role in programmed cell death (apoptosis).
  • Alternative splicing is a key mechanism controlling cell fate decisions.
  • Dysregulation of Grb3-3 function may be implicated in various pathologies.