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Prep1 directly regulates the intrinsic apoptotic pathway by controlling Bcl-XL levels

Nicola Micali1, Carmelo Ferrai, Luis C Fernandez-Diaz

  • 1Laboratory of Molecular Genetics, DiBiT, S. Raffaele Scientific Institute, Via Olgettina 60, 20132 Milan, Italy.

Molecular and Cellular Biology
|December 24, 2008
PubMed

Insights

The transcription factor Prep1 is crucial for embryonic development. It regulates apoptosis by controlling Bcl-x gene expression, maintaining mitochondrial homeostasis.

Area of Science:

  • Molecular Biology
  • Developmental Biology
  • Genetics

Background:

  • The transcription factor Prep1 plays a vital role in embryonic development.
  • Prep1 hypomorphic mutant embryos exhibit increased apoptosis.

Purpose of the Study:

  • To investigate the role of Prep1 in regulating apoptosis and mitochondrial homeostasis.
  • To identify the molecular mechanisms by which Prep1 influences apoptotic pathways.

Main Methods:

  • Analysis of Prep1 hypomorphic mutant mouse embryos and fibroblasts.
  • Assays for apoptosis, mitochondrial membrane potential, and caspase activation.
  • Gene expression analysis of Bcl-x mRNA and protein.
  • Chromatin immunoprecipitation to identify Prep1 targets.

Main Results:

  • Prep1(i/i) MEFs show increased apoptosis and faster response to genotoxic stress.
  • Decreased Bcl-X(L) mRNA and protein levels were observed in hypomorphic MEFs.
  • Bcl-x overexpression rescued the apoptotic defect in Prep1(i/i) MEFs.
  • Prep1 directly targets the Bcl-x promoter.

Conclusions:

  • Prep1 directly controls mitochondrial homeostasis and apoptosis by regulating Bcl-x gene expression.
  • This study identifies a novel mechanism linking transcription factor activity to intrinsic apoptotic pathways.

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