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Updated: Aug 30, 2026

Detection of Mitochondria Membrane Potential to Study CLIC4 Knockdown-induced HN4 Cell Apoptosis In Vitro
13:20

Detection of Mitochondria Membrane Potential to Study CLIC4 Knockdown-induced HN4 Cell Apoptosis In Vitro

Published on: July 17, 2018

Promyelocytic leukemia protein 4 induces apoptosis by inhibition of survivin expression

Zhi-Xiang Xu1, Rui-Xun Zhao, Tian Ding

  • 1Department of Molecular Pathology and Department of Pathology, The University of Texas M. D. Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, TX 77030, USA.

The Journal of Biological Chemistry
|November 5, 2003
PubMed

Insights

The promyelocytic leukemia protein (PML) suppresses Survivin, a key apoptosis regulator. This discovery reveals a new mechanism for PML-driven apoptosis, impacting cancer research.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Cancer Research

Background:

  • The promyelocytic leukemia protein (PML) is crucial in apoptosis pathways.
  • PML inhibits the NF-kappaB survival pathway, enhancing TNF-induced apoptosis.

Purpose of the Study:

  • To elucidate the molecular mechanisms of PML-induced apoptosis.
  • To identify downstream target genes of PML involved in apoptosis.

Main Methods:

  • DNA microarray screening to identify PML target genes.
  • Cotransfection assays to assess promoter activity.
  • Western blot analysis and siRNA for gene expression studies.
  • Cell cycle analysis and assessment of apoptosis markers.

Main Results:

  • Survivin was identified as a downstream target gene of PML.
  • PML isoforms, specifically PML4, repressed Survivin promoter activity.
  • PML induction down-regulated Survivin expression, while PML knockdown or deficiency up-regulated it.
  • PML re-expression in PML-deficient cells reduced Survivin levels.
  • Cells in G2/M phase showed high Survivin and low PML.
  • PML overexpression induced apoptosis via caspase activation and Survivin down-regulation.

Conclusions:

  • PML induces apoptosis through the down-regulation of Survivin.
  • This study uncovers a novel regulatory axis in apoptosis involving PML and Survivin.

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