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Updated: Mar 8, 2026

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

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Role of TLR9 in Oncogenic Virus-Produced Cancer

Cecilia Martínez-Campos1, Ana I Burguete-García1, Vicente Madrid-Marina1

  • 1Dirección de Infecciones Crónicas y Cáncer, Centro de Investigación Sobre Enfermedades Infecciosas, Instituto Nacional de Salud Pública, Cuernavaca , Morelos, Mexico .

Viral Immunology
|February 3, 2017
PubMed

Insights

Toll-like receptor 9 (TLR9) plays a key role in immune responses to DNA. Synthetic oligodeoxynucleotides (ODNs) activate TLR9 for pathogen defense, while some viruses inhibit it, aiding chronic infections and cancer progression.

Area of Science:

  • Immunology
  • Molecular Biology
  • Virology

Background:

  • Toll-like receptor 9 (TLR9) recognizes nucleic acids, initiating immune signaling pathways.
  • Synthetic oligodeoxynucleotides (ODNs) are vital tools for studying TLR9-mediated DNA recognition.
  • TLR9 activation confers protection against various pathogens.

Purpose of the Study:

  • To review TLR9 signaling initiated by ODN recognition.
  • To examine the inhibition of TLR9 expression by oncogenic DNA viruses.
  • To discuss the role of TLR9 in cancer progression.

Main Methods:

  • Review of existing literature on TLR9 function and viral interactions.
  • Analysis of signaling pathways initiated by ODN recognition.
  • Investigation of TLR9 expression modulation by oncogenic viruses.

Main Results:

  • ODNs effectively mimic DNA recognition by TLR9, inducing immune responses.
  • Oncogenic viruses (e.g., HBV, EBV, HPV) actively suppress TLR9 expression.
  • Inhibition of TLR9 is linked to chronic infections and cancer development.

Conclusions:

  • TLR9 is a critical sensor of nucleic acids with broad implications in immunity and disease.
  • Dysregulation of TLR9 by viruses contributes to pathogenesis and oncogenesis.
  • Understanding TLR9's multifaceted roles is essential for therapeutic strategies.
Keywords:
TLR9canceroncogenic virus

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