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Tumor suppressor p53 regulates bile acid homeostasis via small heterodimer partner

Dae-Hwan Kim1, Jae W Lee

  • 1Department of Pediatrics, Oregon Health and Science University, Portland, OR 97239-3098, USA.

Proceedings of the National Academy of Sciences of the United States of America
|July 13, 2011
PubMed

Insights

The tumor suppressor p53 regulates metabolism by lowering bile acid (BA) levels. This occurs through up-regulating small heterodimer partner, impacting BA homeostasis and potentially cancer suppression.

Area of Science:

  • Metabolic regulation
  • Cancer biology
  • Molecular pathways

Background:

  • Metabolic alterations are a hallmark of cancer, observed for nearly a century.
  • Emerging research implicates the tumor suppressor p53 in regulating diverse metabolic pathways.
  • p53's metabolic regulatory functions may extend to normal cellular and organ physiology.

Purpose of the Study:

  • To investigate the role of p53 in regulating bile acid (BA) metabolism.
  • To elucidate the molecular mechanisms by which p53 influences BA homeostasis.
  • To explore the potential connection between p53-mediated BA regulation and tumor suppression.

Main Methods:

  • Analysis of p53's effect on bile acid levels in normal and stressed conditions.
  • Investigating the role of small heterodimer partner (SHP) in p53-mediated BA regulation.
  • Assessing the impact of SHP up-regulation on bile acid synthesis.

Main Results:

  • p53 was demonstrated to lower bile acid (BA) levels under both normal and stressed conditions.
  • This reduction in BA levels is primarily achieved by up-regulating the expression of small heterodimer partner (SHP).
  • SHP acts as a critical inhibitor of BA synthesis, linking p53 to BA homeostasis.

Conclusions:

  • A novel metabolic regulatory axis coupling p53 to bile acid homeostasis has been uncovered.
  • p53 lowers BA levels by up-regulating SHP, a key inhibitor of BA synthesis.
  • This axis warrants further investigation for its potential role in p53-mediated tumor suppression, given the link between excessive BAs and cancer promotion.

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