Comparison of haemophilus influenzae type b interaction with respiratory mucosa organ cultures maintained with an air

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A D Jackson1, P J Cole, R Wilson

  • 1Host Defence Unit, Imperial College of Science, Technology and Medicine, National Heart and Lung Institute, London, United Kingdom.

Infection and Immunity
|June 1, 1996
PubMed

Insights

Haemophilus influenzae type b causes significant epithelial damage in organ cultures. Air interface cultures showed greater bacterial association with mucus and damaged cells compared to immersed cultures, highlighting the impact of culture conditions.

Area of Science:

  • Microbiology
  • Pathogenesis
  • Respiratory Tract Infections

Background:

  • Haemophilus influenzae type b (Hib) is a significant pathogen causing invasive diseases.
  • Understanding bacterial interactions with the respiratory mucosa is crucial for developing effective prevention and treatment strategies.
  • Organ culture models provide valuable insights into host-pathogen dynamics.

Purpose of the Study:

  • To investigate the impact of different organ culture conditions (immersion vs. air interface) on Haemophilus influenzae type b interaction with nasopharyngeal epithelial tissues.
  • To quantify bacterial adherence and identify specific cellular targets in response to varying culture environments.

Main Methods:

  • Organ cultures of human nasopharyngeal tissue were established and maintained under either submerged (immersed) or air-liquid interface conditions.
  • Cultures were infected with Haemophilus influenzae type b for 24 hours.
  • Bacterial association with epithelial cells, mucus, and overall tissue damage were assessed using microscopy and quantitative methods.

Main Results:

  • Both culture methods resulted in significant epithelial damage following Hib infection.
  • Bacterial association with mucus, damaged epithelium, and unciliated cells was significantly higher in air interface cultures compared to immersed cultures.
  • Total bacterial association was substantially greater (55.8-fold) in air interface cultures.
  • Bacteria demonstrated a specific tropism for mucus exclusively in explants maintained at the air interface.

Conclusions:

  • The method of maintaining nasopharyngeal organ cultures significantly influences the interaction between Haemophilus influenzae type b and the mucosal surface.
  • Air-liquid interface cultures more accurately reflect in vivo conditions, showing enhanced bacterial adherence and mucus tropism.
  • Immersion in culture medium may alter bacterial-epithelial interactions, potentially underestimating adherence and tropism.

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