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TWEAK-Fn14 as a mediator of acute kidney injury

Joel M Weinberg1

  • 1Division of Nephrology, Department of Internal Medicine, Veterans Affairs Ann Arbor Healthcare System and University of Michigan, Ann Arbor, Michigan, USA. wnberg@umich.edu

Kidney International
|December 31, 2010
PubMed

Insights

Tumor necrosis factor-like weak inducer of apoptosis (TWEAK) signaling via its receptor fibroblast growth factor-inducible 14 (Fn14) plays a key role in acute kidney injury. TWEAK produced by tubule cells can act on these same cells through upregulated Fn14 receptors.

Area of Science:

  • Nephrology
  • Molecular Biology
  • Cellular Signaling

Background:

  • Tumor necrosis factor-like weak inducer of apoptosis (TWEAK) and its receptor, fibroblast growth factor-inducible 14 (Fn14), are crucial in cellular processes.
  • Their roles in kidney injury and repair are increasingly recognized.
  • The specific mechanisms of TWEAK-Fn14 signaling in acute kidney injury (AKI) require further elucidation.

Purpose of the Study:

  • To investigate the role of the TWEAK-Fn14 pathway in a common clamp ischemia model of AKI.
  • To understand the cellular sources and targets of TWEAK signaling in the injured kidney.

Main Methods:

  • Utilized a clamp ischemia model to induce AKI in a preclinical setting.
  • Analyzed the expression and localization of TWEAK and Fn14 in kidney tissues.
  • Investigated the cellular origins of TWEAK production and its feedback mechanisms.

Main Results:

  • Demonstrated a significant role for Fn14 in the clamp ischemia model of AKI.
  • Identified TWEAK production by tubule cells within the injured kidney.
  • Showed evidence of both paracrine and autocrine signaling, with TWEAK acting on tubule cells via upregulated Fn14 receptors.

Conclusions:

  • The TWEAK-Fn14 axis is implicated in the pathogenesis of AKI.
  • Tubule cell-derived TWEAK exerts autocrine and paracrine effects on kidney tubules during injury.
  • Targeting the TWEAK-Fn14 pathway may offer therapeutic strategies for AKI.

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