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A Chlamydia pneumoniae infection model using established human lymphocyte cell lines.

Hiroyuki Yamaguchi1, Shusaku Haranaga, Herman Friedman

  • 1Department of Medical Microbiology and Immunology, University of South Florida College of Medicine, 12901 Bruce B Downs Blvd, Tampa, FL 33612, USA.

FEMS Microbiology Letters
|November 19, 2002
PubMed
Summary

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This study establishes a novel in vitro model for Chlamydia (Chlamydophila) pneumoniae infection using human lymphocyte cell lines. The model demonstrates successful C. pneumoniae growth in T-cells and B-cells, aiding research into lymphocyte-pathogen interactions.

Area of Science:

  • Immunology
  • Microbiology
  • Cell Biology

Background:

  • Chlamydia (Chlamydophila) pneumoniae is a pathogen with suspected interactions with human lymphocytes.
  • Existing in vitro models may not fully capture lymphocyte-pathogen dynamics.

Purpose of the Study:

  • To establish and validate an in vitro infection model using human lymphocyte cell lines for Chlamydia (Chlamydophila) pneumoniae.
  • To investigate the susceptibility of T-cells and B-cells to C. pneumoniae infection.

Main Methods:

  • Utilized human lymphoid cell lines (Molt 4, P3HR1), monocyte cell line (THP-1), and epithelial cell line (HEp-2).
  • Assessed C. pneumoniae growth via inclusion formation, infective progeny, and antigen levels.
  • Conducted electron microscopy to visualize intracellular bacterial structures.

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Main Results:

  • Both Molt 4 (T-cell) and P3HR1 (B-cell) lines supported C. pneumoniae growth, evidenced by inclusion bodies and increased bacterial load.
  • Monocyte (THP-1) cells also supported growth, though less efficiently than epithelial cells (HEp-2).
  • Electron microscopy confirmed typical Chlamydia elementary bodies within lymphoid cells.

Conclusions:

  • Human lymphocyte cell lines are susceptible to Chlamydia (Chlamydophila) pneumoniae infection.
  • The developed in vitro model using lymphoid cells is suitable for studying lymphocyte-C. pneumoniae interactions.