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Infection and immunity2011; 80(1); 110-120; doi: 10.1128/IAI.05819-11

MyD88-dependent recruitment of monocytes and dendritic cells required for protection from pulmonary Burkholderia mallei infection.

Abstract: The Gram-negative bacterium Burkholderia mallei causes rapidly fatal illness in equines and humans when contracted by inhalation and also has the potential to be used as a bioweapon. However, little is known regarding the early innate immune responses and signaling mechanisms required to generate protection from pneumonic B. mallei infection. We showed previously that monocyte chemoattractant protein 1 (MCP-1) was a critical chemokine required for protection from pneumonic B. mallei infection. We have now extended those studies to identify key Toll-like receptor (TLR) signaling pathways, effector cells, and cytokines required for protection from respiratory B. mallei infection. We found that MyD88-/- mice were highly susceptible to pulmonary challenge with B. mallei and had significantly short survival times, increased bacterial burdens, and severe organ pathology compared to wild-type mice. Notably, MyD88-/- mice had significantly fewer monocytes and dendritic cells (DCs) in lung tissues and airways than infected wild-type mice despite markedly higher bacterial burdens. The MyD88-/- mice were also completely unable to produce gamma interferon (IFN-γ) at any time points following infection. In wild-type mice, NK cells were the primary cells producing IFN-γ in the lungs following B. mallei infection, while DCs and monocytes were the primary cellular sources of interleukin-12 (IL-12) production. Treatment with recombinant IFN-γ (rIFN-γ) was able to significantly restore protective immunity in MyD88-/- mice. Thus, we conclude that the MyD88-dependent recruitment of inflammatory monocytes and DCs to the lungs and the local production of IL-12, followed by NK cell production of IFN-γ, are the key initial cellular responses required for early protection from B. mallei infection.
Publication Date: 2011-10-24 PubMed ID: 22025508PubMed Central: PMC3255660DOI: 10.1128/IAI.05819-11Google Scholar: Lookup
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  • Journal Article
  • Research Support
  • N.I.H.
  • Extramural
  • Research Support
  • Non-U.S. Gov't

Summary

This research summary has been generated with artificial intelligence and may contain errors and omissions. Refer to the original study to confirm details provided. Submit correction.

This research study focuses on understanding the early immune responses and signalling mechanisms needed to protect from B. mallei, a potentially deadly bacteria that causes rapid illness in humans and horses. The study identifies the key pathways, cells, and compounds required for protection against B. mallei and also investigates MyD88’s role in the process, finding it necessary for effective immune response.

Significance of Burkholderia mallei and MyD88

  • Burkholderia mallei is a Gram-negative bacterium that, when inhaled, causes rapidly fatal illness in humans and equines. It also has the potential to be weaponized.
  • It is critical to understand how the innate immune system responds to infection and which signaling procedures are required for protection.
  • In this context, this study highlights the key role of MyD88, a signaling protein that helps to regulate the immune response.

The Role of MyD88, Monocytes, and Dendritic Cells

  • The study found that mice without MyD88 were highly susceptible to B. mallei infection, leading to shorter survival times, higher bacterial burdens, and more severe organ pathology than wild-type mice.
  • The MyD88-deficient mice also had significantly fewer monocytes and dendritic cells in their lungs and airways, despite having higher bacterial burdens.
  • This points to the important role of MyD88 in recruiting these critical immune cells to fight off infection.

Effects on Cytokine Production

  • Beyond cell recruitment, MyD88 also impacts cytokine production, which aids in managing the body’s immune response.
  • The study found that MyD88-deficient mice were utterly unable to produce gamma interferon (IFN-γ) at any point post-infection.
  • Among wild-type mice, NK cells were the main source of IFN-γ production in response to B. mallei infection, while dendritic cells and monocytes were primarily responsible for interleukin-12 production.
  • Notably, treating MyD88-deficient mice with recombinant IFN-γ significantly restored their immunity, underlining the potential therapeutic implications of this study.

Conclusion

  • The researchers concluded that the MyD88-dependent recruitment of monocytes and dendritic cells into the respiratory system is crucial for early protection from B. mallei infection.
  • Furthermore, this process works in tandem with the local production of interleukin-12 and the subsequent NK cell-derived production of IFN-γ.

Cite This Article

APA
Goodyear A, Troyer R, Bielefeldt-Ohmann H, Dow S. (2011). MyD88-dependent recruitment of monocytes and dendritic cells required for protection from pulmonary Burkholderia mallei infection. Infect Immun, 80(1), 110-120. https://doi.org/10.1128/IAI.05819-11

Publication

ISSN: 1098-5522
NlmUniqueID: 0246127
Country: United States
Language: English
Volume: 80
Issue: 1
Pages: 110-120

Researcher Affiliations

Goodyear, Andrew
  • Rocky Mountain RCE, CO, USA.
Troyer, Ryan
    Bielefeldt-Ohmann, Helle
      Dow, Steven

        MeSH Terms

        • Animals
        • Bacterial Load
        • Burkholderia mallei / immunology
        • Dendritic Cells / immunology
        • Disease Models, Animal
        • Female
        • Glanders / immunology
        • Interferon-gamma / metabolism
        • Interleukin-12 / metabolism
        • Lung / microbiology
        • Lung / pathology
        • Male
        • Mice
        • Mice, Inbred C57BL
        • Mice, Knockout
        • Monocytes / immunology
        • Myeloid Differentiation Factor 88 / immunology
        • Myeloid Differentiation Factor 88 / metabolism
        • Pneumonia, Bacterial / immunology
        • Pneumonia, Bacterial / microbiology
        • Survival Analysis

        Grant Funding

        • U54 AI065357 / NIAID NIH HHS
        • U54 AI065357-01 / NIAID NIH HHS

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