Zinc-suppressed inflammatory cytokines by induction of A20-mediated inhibition of nuclear factor-κB

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Published on: January 7, 2019

Ananda S Prasad1, Bin Bao, Frances W J Beck

  • 1Department of Internal Medicine, Division of Hematology/Oncology, Karmanos Cancer Center, Wayne State University School of Medicine, Detroit, Michigan, USA. prasada@karmanos.org

Nutrition (Burbank, Los Angeles County, Calif.)
|November 2, 2010
PubMed
Abstract

Insights

Zinc supplementation induces A20 protein, reducing inflammatory cytokines and oxidative stress. This mechanism suppresses the NF-κB pathway, offering potential therapeutic benefits for chronic diseases.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Immunology

Background:

  • Chronic inflammation and oxidative stress are linked to diseases like atherosclerosis, aging, and cancer.
  • Tumor necrosis factor (TNF)-α and interleukin-1β (IL-1β) are key inflammatory cytokines involved in these conditions.
  • The nuclear factor-κB (NF-κB) signaling pathway plays a crucial role in regulating inflammatory responses.

Purpose of the Study:

  • To investigate the hypothesis that zinc induces A20 protein expression.
  • To determine if A20 inhibits the Iκ kinase-α (IKK-α)/NF-κB pathway.
  • To assess the effect of zinc-induced A20 on the downregulation of TNF-α and IL-1β.

Main Methods:

  • Utilized HL-60, human umbilical vein endothelial cells, and SW480 cell lines under varying zinc conditions.
  • Measured oxidative stress markers, inflammatory cytokines, A20 protein/mRNA, A20-TRAF-1 complex, and IKK-α/NF-κB signaling.
  • Employed antisense A20 and siRNA studies to confirm the regulatory role of zinc in cytokine production.

Main Results:

  • Zinc sufficiency increased A20 protein and the A20-TRAF-1 complex in tested cell lines.
  • Zinc significantly decreased IKK-α/NF-κB signaling, oxidative stress markers, and inflammatory cytokine levels.
  • Antisense and siRNA A20 studies confirmed zinc-induced A20's role in downregulating TNF-α and IL-1β.

Conclusions:

  • Zinc induces A20 protein expression in premonocytic, endothelial, and cancer cells.
  • Zinc-induced A20 suppresses the NF-κB signaling pathway, reducing inflammatory cytokine generation.
  • Findings suggest zinc's potential as a therapeutic agent against chronic inflammatory diseases.

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