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Screening Bioactive Nanoparticles in Phagocytic Immune Cells for Inhibitors of Toll-like Receptor Signaling
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Negative regulators in Toll-like receptor responses.

Shizuo Akira1, Tatsuya Saitoh, Kazufumi Matsushita

  • 1From the Laboratory of Host Defense, WPI Immunology Frontier Research Center, Osaka University, Osaka, Japan.

Cornea
|October 12, 2010
PubMed
Summary

Autophagy-related gene Atg16L1 controls endotoxin responses, while novel gene Zc3h12a deficiency causes autoimmune disease. These findings reveal new roles for molecules in toll-like receptor (TLR) immune responses.

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Using RNA-interference to Investigate the Innate Immune Response in Mouse Macrophages
12:47

Using RNA-interference to Investigate the Innate Immune Response in Mouse Macrophages

Published on: November 3, 2014

Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • Pattern recognition receptors, including toll-like receptors (TLRs), initiate innate immunity by sensing microbial structures.
  • TLR activation orchestrates gene expression networks crucial for immune response magnitude and duration.
  • Autophagy is a cellular degradation process involved in clearing pathogens and protein aggregates.

Purpose of the Study:

  • To investigate the role of the autophagy-related gene Atg16L1 in toll-like receptor (TLR)-mediated inflammatory responses.
  • To identify and characterize novel genes involved in the effector phase of TLR responses using knockout (KO) mouse models.
  • To elucidate the function of the nuclease Zc3h12a in regulating inflammatory gene expression.

Main Methods:

  • Generation and analysis of mutant mice lacking Atg16L1.
  • Generation and characterization of KO mice for novel genes induced by TLR stimulation, including Zc3h12a.
  • Assessment of inflammatory mediator production (e.g., interleukin-1) and disease phenotypes (e.g., splenomegaly, lymphadenopathy).

Main Results:

  • Mice lacking Atg16L1 showed impaired autophagosome formation and enhanced endotoxin-induced interleukin-1 production, indicating its role in controlling inflammatory responses.
  • KO mice lacking the novel gene Zc3h12a spontaneously developed autoimmune diseases.
  • Zc3h12a encodes a nuclease that destabilizes IL-6 and IL-12 messenger RNAs.

Conclusions:

  • Atg16L1 is essential for suppressing endotoxin-mediated inflammatory responses through its role in autophagy.
  • The novel gene Zc3h12a plays a critical role in preventing autoimmune diseases, likely through regulating inflammatory cytokine mRNA stability.
  • These studies highlight the importance of specific genes in the complex regulatory network of TLR-mediated immunity and inflammation.