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Toll-Like Receptor 2 Modulates Pulmonary Inflammation and TNF-α Release Mediated by Mycoplasma pneumoniae

Ming Chen1,2, Huan Deng1, Yue Zhao1

  • 1Department of Respiratory Medicine, Children's Hospital of Nanjing Medical University, Nanjing, China.

Frontiers in Cellular and Infection Microbiology
|April 4, 2022
PubMed
Abstract

Insights

Toll-like receptor 2 (TLR2) plays a key role in lung inflammation caused by Mycoplasma pneumoniae. This receptor regulates tumor necrosis factor alpha (TNF-α) release via the TLR2-MyD88-NF-κB pathway.

Area of Science:

  • Immunology
  • Pulmonology
  • Microbiology

Background:

  • Mycoplasma pneumoniae (MP) is a common cause of childhood pneumonia.
  • Toll-like receptors (TLRs) are crucial in innate immunity and inflammatory responses.
  • The specific role of TLRs in MP-induced lung inflammation requires further elucidation.

Purpose of the Study:

  • To investigate the role of Toll-like receptors (TLRs) in lung inflammation mediated by Mycoplasma pneumoniae (MP).
  • To examine the involvement of TLR2 in TNF-α release and inflammatory responses during MP infection.

Main Methods:

  • Monitored TLRs and TNF-α in children with MP pneumonia (MPP).
  • Investigated signaling pathways regulating TNF-α in A549 cells and neutrophils stimulated with MP.
  • Analyzed TNF-α levels and lung pathology in TLR2 knockout mice after MP infection.

Main Results:

  • Elevated TNF-α and TLR2 levels were observed in children with MPP, particularly refractory cases.
  • MP stimulation increased TNF-α, TLR2, MyD88, and p-p65 in cells; TLR2 silencing and MyD88/NF-κB inhibition reduced TNF-α.
  • TLR2 knockout mice showed reduced TNF-α and lung inflammation compared to wild-type.

Conclusions:

  • TLR2 is a key regulator of lung inflammation and TNF-α release in MP infections.
  • The TLR2-MyD88-NF-κB signaling pathway is critical for mediating these responses.
Keywords:
A549 cellsMyD88Mycoplasma pneumoniaeNF-κBTLR2TNF-αneutrophils

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