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  3. A Role For P53 In Terminal Epithelial Cell Differentiation.
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  3. A Role For P53 In Terminal Epithelial Cell Differentiation.

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A role for p53 in terminal epithelial cell differentiation.

Zubaida Saifudeen1, Susana Dipp, Samir S El-Dahr

  • 1Department of Pediatrics, SL-37, Tulane University Health Sciences Center, 1430 Tulane Avenue, New Orleans, LA 70112, USA.

The Journal of Clinical Investigation
|April 17, 2002

View abstract on PubMed

Summary
This summary is machine-generated.

The tumor suppressor protein p53 is essential for terminal differentiation of kidney epithelial cells. Loss of p53 disrupts renal function gene expression and causes kidney abnormalities.

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Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Nephrology

Background:

  • Terminal differentiation of renal epithelial cells is vital for kidney development and function.
  • Failure in this differentiation process can lead to kidney dysplasia, cystogenesis, and cancer.

Purpose of the Study:

  • To investigate the role of the tumor suppressor protein p53 in the terminal differentiation of renal epithelial cells.
  • To determine if p53 influences the expression of renal function genes (RFGs).

Main Methods:

  • Analysis of p53 and RFG expression in developing kidneys.
  • Chromatin immunoprecipitation assays to assess p53 binding to RFG promoters.
  • Studies using dominant-negative p53 mutants and p53-null mouse models.
  • Evaluation of p73's ability to compensate for p53 loss.

Main Results:

  • p53 is highly expressed in differentiating renal epithelial cells and co-localizes with RFGs.
  • p53 directly binds to and activates the promoters of RFGs.
  • Inhibition of p53 function impairs RFG expression.
  • p53-null mice display aberrant renal phenotypes and disorganized RFG expression.
  • The related protein p73 cannot functionally replace p53 in activating RFGs.

Conclusions:

  • p53 is a key regulator promoting the biochemical and morphological differentiation of the renal epithelium.
  • Aberrations in p53-mediated differentiation may contribute to nephron dysgenesis and dysfunction.
  • p53 plays a critical role in maintaining kidney structure and function through regulating RFGs.