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C-jun inhibits mammary apoptosis in vivo

Sanjay Katiyar1, Mathew C Casimiro, Luis Dettin

  • 1Department of Cancer Biology, Thomas Jefferson University, Philadelphia, PA 19107, USA.

Molecular Biology of the Cell
|October 8, 2010
PubMed

Insights

Endogenous c-jun protein inhibits apoptosis by regulating reactive oxygen species (ROS) production and maintaining mitochondrial integrity. This study defines c-jun

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Cancer Research

Background:

  • c-jun is a key component of the AP-1 complex, implicated in both apoptosis induction and inhibition.
  • Overexpression of c-jun is observed in various human cancers.
  • Germline deletion of c-jun is embryonically lethal, highlighting its essential role.

Purpose of the Study:

  • To elucidate the function of endogenous c-jun in regulating apoptosis.
  • To investigate the mechanisms by which c-jun influences cell survival and death pathways.

Main Methods:

  • Utilized floxed c-jun (c-jun(f/f)) conditional knockout mice for mammary epithelial cell-targeted somatic deletion.
  • Employed laser capture microdissection to analyze gene expression.
  • Investigated the role of reactive oxygen species (ROS) and mitochondrial pathways.

Main Results:

  • Endogenous c-jun was found to inhibit the expression of apoptosis-inducing genes.
  • c-jun actively suppresses the expression of reactive oxygen species (ROS)-reducing genes, including MnSOD and catalase.
  • c-jun-mediated cell survival is partially dependent on ROS production, with repression occurring via mitochondrial complex I and NOX I.

Conclusions:

  • Endogenous c-jun plays a critical role in promoting cell survival.
  • c-jun maintains cell survival by preserving mitochondrial integrity.
  • c-jun regulates the expression of key genes involved in ROS production and detoxification.

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