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Lethal activity of FADD death domain in renal tubular epithelial cells

P Justo1, A B Sanz, C Lorz

  • 1Department of Medical Science, Division of Nephrology and Hypertension, Unidad de Diálisis, Fundación Jiménez Díaz, Universidad Autonoma de Madrid, Madrid, Spain.

Kidney International
|May 12, 2006
PubMed

Insights

Fas-associated death domain (FADD) protein regulates renal tubular cell death independently of death receptors. Overexpressing FADD or its death effector domain (DED) in kidney cells induces apoptosis, offering insights into acute renal failure mechanisms.

Area of Science:

  • Molecular biology
  • Cell biology
  • Renal physiology

Background:

  • Fas-associated death domain (FADD) is an adaptor protein crucial for transmitting death signals from TNF superfamily death receptors.
  • FADD expression is elevated in renal tubules during acute renal failure, suggesting a role in tubular injury.

Purpose of the Study:

  • To investigate the function of FADD in renal tubular epithelium.
  • To determine FADD's contribution to renal tubular cell survival and apoptosis.

Main Methods:

  • Studied FADD expression in mouse kidney samples.
  • Overexpressed FADD and FADD-death domain (FADD-DD) in murine tubular epithelial cells and a cell line.
  • Assessed cell death mechanisms, including caspase and serine protease inhibition, and effects on nuclear factor-kappa B (NF-κB) activity.

Main Results:

  • FADD is expressed in healthy renal tubules.
  • Both FADD and FADD-DD induced apoptosis in tubular cells.
  • FADD-DD-induced apoptosis showed distinct characteristics, not blocked by caspase inhibitors alone, but partially by combined caspase and serine protease inhibition.
  • Overexpression of FADD and FADD-DD reduced NF-κB activity.

Conclusions:

  • FADD possesses a death regulatory function in renal tubular cells independent of death receptors.
  • The FADD-death domain (FADD-DD) is sufficient to trigger apoptosis in these cells.
  • Findings contribute to understanding FADD's role in tubular injury and acute renal failure.

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