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Related Concept Videos

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NF-κB-dependent Signaling Pathway

The transcription factor NF-κB was discovered in 1986 in the lab of Nobel laureate Professor David Baltimore, for its interaction with the immunoglobulin light chain enhancer in B-cells. After more than three decades of study, it is now evident that NF-κB regulates the expression of over 100 genes. Most of these genes play an essential role in the innate and adaptive immune responses as well as the inflammatory responses of animals.
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Related Experiment Video

Updated: Jul 16, 2026

Screening Bioactive Nanoparticles in Phagocytic Immune Cells for Inhibitors of Toll-like Receptor Signaling
09:51

Screening Bioactive Nanoparticles in Phagocytic Immune Cells for Inhibitors of Toll-like Receptor Signaling

Published on: July 26, 2017

DNA motifs suppressing TLR9 responses.

Angela Trieu1, Tara L Roberts, Jasmyn A Dunn

  • 1Institute for Molecular Bioscience and CRC for Chronic Inflammatory Diseases, University of Queensland, Brisbane 4072, Australia.

Critical Reviews in Immunology
|March 8, 2007
PubMed
Summary

Researchers categorized Toll-like receptor 9 (TLR9) inhibitors into four classes. Class I G-rich oligodeoxynucleotides (ODN) show the most promise as selective and potent TLR9 inhibitors for treating diseases like lupus.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • Immune cells utilize Toll-like receptor 9 (TLR9) to detect bacterial DNA with unmethylated CpG motifs.
  • TLR9 is implicated in the pathogenesis of systemic lupus erythematosus (SLE), driving interest in TLR9 inhibitors.
  • A diverse range of DNA sequences and structures are reported to inhibit TLR9-mediated responses, necessitating clear categorization.

Purpose of the Study:

  • To categorize and characterize different types of TLR9-inhibitory oligodeoxynucleotides (ODN).
  • To identify the most promising ODN class for therapeutic applications targeting TLR9.

Main Methods:

  • Provisional categorization of TLR9-inhibitory ODN into four classes based on sequence and presumed mechanism of action.
  • Analysis of Class I: short, G-rich ODN for sequence-specific inhibition.
  • Analysis of Class II: telomeric repeat motifs affecting STAT signaling.
  • Analysis of Class III: oligo (dG) forming quadruplex structures inhibiting DNA uptake.
  • Analysis of Class IV: long, phosphorothioate-modified ODN (PS-ODN) for sequence-nonspecific inhibition.

Main Results:

  • Class I ODN are short, G-rich sequences demonstrating sequence-specific inhibition of all TLR9 responses, potentially acting as direct competitive inhibitors.
  • Class II ODN, based on telomeric repeats, inhibit STAT signaling and are not TLR9-specific.
  • Class III ODN, composed of oligo (dG), form quadruplex structures that impede DNA uptake.
  • Class IV ODN are long, phosphorothioate-modified ODN (PS-ODN) that inhibit TLR9 responses without sequence specificity.
  • Class I G-rich motifs emerged as the most promising candidates for selective and potent TLR9 inhibition.

Conclusions:

  • The classification provides a framework for understanding diverse TLR9-inhibitory ODN.
  • Class I G-rich ODN represent a promising therapeutic strategy for TLR9-related conditions.
  • Further research into Class I ODN could lead to novel treatments for autoimmune diseases like SLE.