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Toll-like receptor 3 ligands induce CD80 expression in human podocytes via an NF-κB-dependent pathway

Michiko Shimada1, Takuji Ishimoto, Pui Y Lee

  • 1Division of Renal Diseases and Hypertension, University of Colorado Denver, Aurora, CO, USA. mshimada@cc.hirosaki-u.ac.jp

Nephrology, Dialysis, Transplantation : Official Publication of the European Dialysis and Transplant Association - European Renal Association
|May 28, 2011
PubMed

Insights

Toll-like receptor 3 (TLR3) activation in human podocytes induces CD80 expression, a key factor in minimal-change disease (MCD) proteinuria. This pathway, dependent on nuclear factor kappa B (NF-κB), is partially inhibited by dexamethasone.

Area of Science:

  • Nephrology
  • Immunology
  • Cell Biology

Background:

  • CD80 (B7.1) is expressed on podocytes in minimal-change disease (MCD), potentially mediating proteinuria.
  • Toll-like receptor (TLR) ligands, known to induce CD80 on dendritic cells, were investigated for similar effects on podocytes.

Purpose of the Study:

  • To evaluate the ability of Toll-like receptors (TLRs) to induce CD80 expression in cultured human podocytes.
  • To elucidate the signaling pathway and potential therapeutic interventions for TLR-induced podocyte injury.

Main Methods:

  • Cultured human podocytes were assessed for TLR expression.
  • Polyinosinic-polycytidylic acid (polyIC), a TLR3 ligand, was used to stimulate CD80 expression.
  • Effects on Cathepsin L, synaptopodin, actin cytoskeleton, and signaling pathways (NF-κB, interferon) were analyzed.
  • CD80 knockdown and treatment with dexamethasone or NF-κB inhibitors were performed.

Main Results:

  • Podocytes express TLR1-6 and 9 mRNA.
  • PolyIC and lipopolysaccharide significantly induced CD80 mRNA expression, with polyIC showing the strongest effect.
  • PolyIC induced podocyte injury markers (increased Cathepsin L, decreased synaptopodin, actin reorganization) and activated NF-κB and interferon signaling.
  • CD80 knockdown mitigated polyIC-induced podocyte changes.
  • Dexamethasone and NF-κB inhibition reduced CD80 expression.

Conclusions:

  • TLR3 activation in human podocytes induces CD80 expression and phenotypic changes via an NF-κB-dependent mechanism.
  • Dexamethasone partially blocks this pathway, suggesting a link between viral infections, TLR activation, and proteinuria in MCD.
  • These findings offer insights into the pathogenesis of proteinuria in viral-associated kidney diseases.
Abstract

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