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Identification of Intracellular Signaling Events Induced in Viable Cells by Interaction with Neighboring Cells Undergoing Apoptotic Cell Death
09:18

Identification of Intracellular Signaling Events Induced in Viable Cells by Interaction with Neighboring Cells Undergoing Apoptotic Cell Death

Published on: December 27, 2016

TCTP protects from apoptotic cell death by antagonizing bax function

L Susini1, S Besse, D Duflaut

  • 1Molecular Engines Laboratories, 20 rue Bouvier, Paris, France.

Cell Death and Differentiation
|February 16, 2008
PubMed

Insights

Translationally controlled tumor protein (TCTP) prevents apoptosis, crucial for embryonic development. This study reveals TCTP inhibits Bax dimerization and mitochondrial membrane insertion, confirming its antiapoptotic role.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Translationally controlled tumor protein (TCTP) is a growth regulator involved in cancer.
  • TCTP is known to have antiapoptotic functions, but the mechanism remains unclear.
  • TCTP plays a role in embryonic development.

Purpose of the Study:

  • To elucidate the mechanism of TCTP's antiapoptotic function.
  • To investigate the in vivo role of TCTP during embryogenesis.
  • To determine the structural basis for TCTP's antiapoptotic activity.

Main Methods:

  • Mouse models to study TCTP loss-of-function during embryogenesis.
  • X-ray crystallography to determine the structure of human TCTP.
  • Site-directed mutagenesis to assess the role of specific TCTP helices.
  • Mitochondrial membrane insertion and Bax dimerization assays.

Main Results:

  • TCTP deficiency in mice leads to embryonic lethality due to increased apoptosis.
  • The crystal structure of TCTP reveals similarity to Bax, a proapoptotic protein.
  • Specific TCTP helices (H2-H3) are critical for its antiapoptotic function.
  • TCTP antagonizes apoptosis by inserting into the mitochondrial membrane and inhibiting Bax dimerization.

Conclusions:

  • TCTP is essential for embryonic development by preventing apoptosis.
  • TCTP's antiapoptotic mechanism involves direct interaction with the mitochondrial pathway.
  • TCTP inhibits Bax-mediated mitochondrial outer membrane permeabilization, thus preventing apoptosis.

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