Dynamics of the development of Chlamydophila psittaci inclusions in epithelial and fibroblast host cells

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C Escalante-Ochoa1, R Ducatelle, F Haesebrouck

  • 1Faculty of Veterinary Medicine, University of Ghent, Merelbeke, Belgium.

Journal of Veterinary Medicine. B, Infectious Diseases and Veterinary Public Health
|July 20, 2000
PubMed

Insights

Chlamydophila psittaci inclusion development differs between fibroblast and epithelial cells. Host cell characteristics, not adaptation, are key for Chlamydophila psittaci growth.

Area of Science:

  • Microbiology
  • Cell Biology
  • Infectious Diseases

Background:

  • Chlamydophila psittaci (formerly Chlamydia psittaci) is an obligate intracellular bacterium.
  • Understanding Chlamydophila psittaci development within host cells is crucial for studying chlamydial infections.

Purpose of the Study:

  • To investigate the development of Chlamydophila psittaci inclusions in fibroblast (L-929) and epithelial (BGM) cell lines.
  • To compare chlamydial growth dynamics and inclusion morphology in different host cell types.

Main Methods:

  • Infection of L-929 and BGM cells with a BGM cell-adapted Chlamydophila psittaci strain.
  • Monitoring inclusion number and size at various time points post-infection (24-54 hours).
  • Assessing the effect of cycloheximide and polyethylene glycol on inclusion development.

Main Results:

  • Significant differences in Chlamydophila psittaci inclusion numbers and sizes were observed between L-929 and BGM cells.
  • Higher inclusion numbers were found in L-929 cells (P < 0.05), while larger inclusions developed in BGM cells (P < 0.01).
  • Inclusions significantly increased in size over time in both cell types, with extracellular particles appearing at later time points.

Conclusions:

  • Host cell characteristics and inherent compatibility play a more significant role in Chlamydophila psittaci development than host cell adaptation.
  • The study highlights the importance of host-pathogen interactions in intracellular bacterial development.

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