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Related Experiment Video

Updated: Nov 28, 2025

Purification of the Membrane Compartment for Endoplasmic Reticulum-associated Degradation of Exogenous Antigens in Cross-presentation
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Microbial Lipid A Remodeling Controls Cross-Presentation Efficiency and CD8 T Cell Priming by Modulating Dendritic

George Papadopoulos1,2, Robert Berland2, Ashwini Sunkavalli2

  • 1Department of Medicine, Section of Infectious Diseases, Boston University School of Medicine, Boston, Massachusetts, USA.

Infection and Immunity
|December 1, 2020
PubMed
Summary

Porphyromonas gingivalis modifies its lipid A to evade immune detection by Toll-like receptor 4 (TLR4). This evasion impairs dendritic cell responses and T cell activation, contributing to chronic inflammation and systemic disorders.

Keywords:
Porphyromonas gingivalisTLR4antigen cross-presentationbacterial pathogenesisdendritic cellsinflammationlipid A

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Area of Science:

  • Immunology
  • Microbiology
  • Bacterial Pathogenesis

Background:

  • Gram-negative bacteria trigger immune responses via lipid A binding to Toll-like receptor 4 (TLR4).
  • Lipid A modifications can allow bacteria to evade host immune detection.
  • Porphyromonas gingivalis, a periodontium colonizer, modifies its lipid A structure.

Purpose of the Study:

  • To investigate how Porphyromonas gingivalis lipid A modifications influence TLR4-dependent innate and adaptive immunity.
  • To determine the role of lipid A remodeling in immune evasion and T cell priming.

Main Methods:

  • Utilized mouse bone marrow-derived dendritic cells (BMDCs).
  • Analyzed the impact of P. gingivalis lipid A modifications on cytokine production (e.g., IFN-β).
  • Assessed antigen degradation, cross-presentation, and CD8 T cell cross-priming.

Main Results:

  • Lipid A 4'-phosphate removal by P. gingivalis is crucial for evading BMDC proinflammatory cytokine responses.
  • This modification significantly reduces beta interferon (IFN-β) production.
  • Lipid A 4'-phosphatase activity impairs antigen degradation, leading to inefficient cross-presentation and reduced CD8 T cell priming.

Conclusions:

  • P. gingivalis lipid A modifications enable immune evasion by dampening innate immune responses.
  • These modifications hinder adaptive immunity by impairing antigen presentation and T cell activation.
  • Lipid A remodeling by P. gingivalis contributes to chronic infections and associated systemic inflammatory disorders.