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The FGL2/fibroleukin prothrombinase is involved in alveolar macrophage activation in COPD through the MAPK pathway

Yanling Liu1, Sanpeng Xu, Fei Xiao

  • 1Department and Institute of Infectious Disease, Tongji Hospital of Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430030, PR China.

Biochemical and Biophysical Research Communications
|May 5, 2010
PubMed

Insights

Fibrinogen-like protein 2 (FGL2) drives macrophage activation in chronic obstructive pulmonary disease (COPD) lungs. Targeting FGL2 may offer new therapeutic strategies for COPD by modulating immune responses.

Area of Science:

  • Immunology
  • Pulmonary Medicine
  • Molecular Biology

Background:

  • Fibrinogen-like protein 2 (FGL2)/fibroleukin exhibits immunomodulatory activity, influencing immune cell maturation and proliferation.
  • FGL2 is implicated in the pathogenesis of inflammatory diseases via

Purpose of the Study:

  • To investigate the role of FGL2 in macrophage activation within the context of chronic obstructive pulmonary disease (COPD).
  • To elucidate the molecular mechanisms, specifically the mitogen-activated protein kinase (MAPK) pathway, by which FGL2 influences macrophage behavior in COPD.

Main Methods:

  • Analysis of FGL2 expression in alveolar macrophages from COPD patients.
  • In vitro studies using LPS-induced FGL2 knockdown in THP-1 cells to assess macrophage activation markers and inflammatory cytokine production.
  • Immunohistochemical analysis of FGL2 and phosphorylated p38-MAPK in lung tissues.

Main Results:

  • Upregulated FGL2 expression and increased macrophage activation markers (CD11b, CD14) were observed in COPD patients.
  • FGL2 knockdown reduced macrophage activation markers (CD11b, CD11c, CD71), inhibited cell migration, and decreased inflammatory cytokine (IL-8, MMP-9) production.
  • FGL2 knockdown altered MAPK pathway signaling, downregulating p38-MAPK phosphorylation and upregulating JNK phosphorylation.

Conclusions:

  • FGL2 plays a significant role in macrophage activation in COPD lungs.
  • FGL2 modulates macrophage activation through the MAPK signaling pathway, suggesting it as a potential therapeutic target for COPD.

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