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Host cell cytokines induced by Chlamydia pneumoniae decrease the expression of interstitial collagens and fibronectin

Jürgen Baumert1, Karl-Hermann Schmidt, Annett Eitner

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Chlamydia pneumoniae infection reduces interstitial collagen and fibronectin in airway and vascular cells. This may influence tissue remodeling in COPD, asthma, and atherosclerosis plaque vulnerability.

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Area of Science:

  • Microbiology
  • Cell Biology
  • Pathology

Background:

  • Chlamydia pneumoniae infection is linked to chronic obstructive pulmonary disease (COPD), asthma, and atherosclerosis.
  • Tissue remodeling in these conditions involves subepithelial fibrosis and increased interstitial collagens.

Purpose of the Study:

  • To investigate the effect of Chlamydia pneumoniae infection on the expression of interstitial collagens and fibronectin in human fibroblasts and smooth muscle cells.
  • To elucidate the role of host cell cytokines in mediating these changes.

Main Methods:

  • Reverse transcription-PCR and immunoblotting were used to assess collagen and fibronectin expression.
  • Experiments involved infecting human cells with C. pneumoniae TW-183.
  • Conditioned media from infected cells and blocking antibodies were utilized.
  • Small interfering RNA (siRNA) was used to target CCAAT/enhancer-binding protein beta.

Main Results:

  • C. pneumoniae infection downregulated type I and III collagen and fibronectin expression in fibroblasts and smooth muscle cells.
  • Conditioned media from infected cells inhibited interstitial collagen and fibronectin in uninfected cells.
  • Beta interferon contributed to inhibition by fibroblast-conditioned media, while interleukin-1alpha mediated inhibition by epithelial cell-conditioned media.
  • siRNA targeting CCAAT/enhancer-binding protein beta diminished the downregulation of matrix proteins.

Conclusions:

  • Chlamydia pneumoniae infection modulates interstitial collagen and fibronectin expression through host cell cytokine responses.
  • This modulation may impact tissue remodeling in airway diseases like COPD and asthma.
  • Inhibition of collagen synthesis in atherosclerosis may increase plaque vulnerability and rupture risk.