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Decreased inflammatory response in Toll-like receptor 2 knockout mice is associated with exacerbated Pneumocystis

Shao-Hung Wang1, Chen Zhang, Mark E Lasbury

  • 1Department of Medical Research, E-DA Hospital, I-Shou University, Kaohsiung 824, Taiwan, ROC.

Microbes and Infection
|April 11, 2008
PubMed

Insights

Toll-like receptor 2 (TLR2) deficiency in mice reduced lung inflammation during Pneumocystis pneumonia (PcP). However, it also increased parasite burden, indicating TLR2 plays a role in clearing Pneumocystis.

Area of Science:

  • Immunology
  • Infectious Diseases
  • Pulmonary Medicine

Background:

  • Pneumocystis pneumonia (PcP) causes significant lung inflammation and injury.
  • Toll-like receptor 2 (TLR2) is known to mediate macrophage inflammatory responses to Pneumocystis.

Purpose of the Study:

  • To investigate the role of TLR2 in the host response to Pneumocystis pneumonia.
  • To determine if TLR2 deficiency impacts lung inflammation and parasite clearance.

Main Methods:

  • Histopathology examination of lungs from wild-type and TLR2-/- mice infected with Pneumocystis.
  • Measurement of inflammatory markers such as TNF-alpha and NF-kappaB activation.
  • Assessment of organism burden and expression of protective mechanism-related genes (iNOS, p47phox).

Main Results:

  • TLR2-/- mice with PcP showed reduced pulmonary inflammation and lower levels of TNF-alpha and NF-kappaB activation.
  • Conversely, TLR2-/- mice exhibited increased PcP symptom severity and higher Pneumocystis organism burden.
  • Decreased mRNA levels of inducible nitric oxide synthase (iNOS) and NADPH oxidase p47phox, along with lower nitric oxide levels, were observed in TLR2-/- PcP mice.

Conclusions:

  • TLR2-mediated inflammation contributes to lung injury in PcP but is also essential for controlling Pneumocystis organism burden.
  • TLR2 plays a dual role in PcP, modulating both inflammation and parasite clearance through mechanisms involving iNOS and NADPH oxidase.

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