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Mechanisms of p53 activation and physiological relevance in the developing kidney

Karam Aboudehen1, Sylvia Hilliard, Zubaida Saifudeen

  • 1Department of Pediatrics,, Tulane University School of Medicine, 1430 Tulane Ave., New Orleans, LA 70112, USA.

American Journal of Physiology. Renal Physiology
|January 13, 2012
PubMed

Insights

Posttranslational modifications like phosphorylation and acetylation regulate the tumor suppressor p53 in the developing kidney, influencing nephron differentiation and renal function gene expression.

Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Nephrology

Background:

  • The tumor suppressor protein p53 is crucial for cellular responses to stress but is typically degraded rapidly.
  • Posttranslational modifications stabilize p53, preventing degradation and enabling its function in cell cycle arrest and apoptosis.
  • Previous work established p53 regulation's importance in kidney development, but the specific mechanisms in the developing kidney remained unclear.

Purpose of the Study:

  • To investigate the mechanisms of p53 activation in the developing kidney.
  • To determine the role of specific posttranslational modifications (phosphorylation and acetylation) in p53 stability and function during nephrogenesis.
  • To elucidate how p53 modifications influence the expression of renal function genes (RFGs).

Main Methods:

  • Site-directed mutagenesis to study the effects of specific p53 modifications.
  • Section immunofluorescence to analyze the spatiotemporal expression of modified p53.
  • Assessing p53 DNA-binding activity and occupancy of RFG promoters.
  • Utilizing p53 loss-of-function and gain-of-function models.

Main Results:

  • Metanephric p53 undergoes phosphorylation and acetylation in a pattern correlating with developmental stage and p53 activity.
  • Specific phosphorylation (S392) and acetylation (K373/K382/K386) sites exhibit distinct spatiotemporal expression patterns in developing kidney cells.
  • These modifications differentially affect p53 stability and its transcriptional regulation of RFGs.
  • p53 binding to RFG promoters increases during tubular differentiation, and p53 is essential, though not solely sufficient, for RFG expression.

Conclusions:

  • Posttranslational modifications are critical regulators of p53 stability and function during kidney development.
  • Modified p53 isoforms display specific localization patterns, guiding their roles in differentiating nephron segments.
  • p53 activity, modulated by these modifications, plays a necessary role in the expression of genes vital for renal function.
  • Embryonic microenvironment stress, such as hypoxia, may trigger p53 activation in the developing kidney.

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