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Yeast As a Chassis for Developing Functional Assays to Study Human P53
14:57

Yeast As a Chassis for Developing Functional Assays to Study Human P53

Published on: August 4, 2019

Reciprocal repression between P53 and TCTP

Robert Amson1, Salvatore Pece, Alexandra Lespagnol

  • 1Centre National de la Recherche Scientifique-Unité Mixte de Recherche 8113, Laboratoire de Biotechnologie et Pharmacologie génétique Appliquée, École Normale Supérieure, Cachan, France.

Nature Medicine
|December 14, 2011
PubMed

Insights

Translationally controlled tumor protein (TCTP) promotes cancer cell survival by degrading P53. Inhibiting TCTP restores P53 levels, sensitizes tumors to apoptosis, and may offer new cancer treatment strategies.

Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • Translationally controlled tumor protein (TCTP) is implicated in cancer progression.
  • The tumor suppressor P53 plays a critical role in apoptosis and tumor suppression.
  • A regulatory relationship between TCTP and P53 has not been previously defined.

Purpose of the Study:

  • To elucidate the regulatory interaction between TCTP and P53.
  • To investigate the role of this interaction in cancer cell biology and prognosis.
  • To explore potential therapeutic strategies targeting the TCTP-P53 axis.

Main Methods:

  • Investigated the interaction between TCTP and P53 using biochemical assays.
  • Utilized Tctp haploinsufficient mouse models to study P53-dependent apoptosis.
  • Analyzed TCTP and P53 expression in human breast cancer samples.
  • Assessed the effect of Tctp knockdown in cancer cells.
  • Examined the impact of pharmacological compounds on the TCTP-P53 pathway.

Main Results:

  • Identified a negative feedback loop where TCTP promotes P53 degradation via the MDM2 complex.
  • P53 was found to directly repress TCTP transcription.
  • High TCTP levels in breast cancer correlate with aggressive G3 tumors and poor prognosis.
  • Tctp knockdown increased P53 expression and reduced stem-like cancer cells.
  • Sertraline and thioridazine were shown to increase P53 levels by targeting TCTP.

Conclusions:

  • Established a novel regulatory circuit between TCTP and P53, impacting apoptosis and tumor suppression.
  • TCTP's role in promoting P53 degradation highlights its significance in aggressive cancers.
  • Targeting TCTP offers a potential therapeutic avenue for enhancing P53 function and treating cancer.

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