Exposure to common respiratory bacteria alters the airway epithelial response to subsequent viral infection.

Abstract:

BACKGROUND:Colonization of the airways with potential pathogenic bacteria is observed in a number of chronic respiratory diseases, such as COPD or cystic fibrosis. Infections with respiratory viruses are known triggers of exacerbations of these diseases. We here investigated if pre-exposure to bacteria alters the response of lung epithelial cells to subsequent viral infection. METHODS:Bronchial epithelial cells (BEAS-2B cells and primary bronchial epithelial cells) were exposed to heat-inactivated Haemophilus influenzae, Pseudomonas aeruginosa or Streptococcus pneumoniae and subsequently infected with respiratory syncytial virus (RSV), type 2 human adenovirus or influenza B. Levels of pro-inflammatory cytokines, viral replication and expression of pattern recognition receptors were determined in culture supernatants and/or cell lysates. RESULTS:Exposure of BEAS-2B cells to H. influenzae before and during RSV-infection synergistically increased the release of IL-6 (increase above calculated additive effect at 72 h: 56 % ± 3 %, mean ± SEM) and IL-8 (53 % ± 12 %). This effect was sustained even when bacteria were washed away before viral infection and was neither associated with enhanced viral replication, nor linked to increased expression of key pattern recognition receptors. P. aeruginosa enhanced the release of inflammatory cytokines to a similar extent, yet only if bacteria were also present during viral infection. S. pneumoniae did not enhance RSV-induced cytokine release. Surprisingly, adenovirus infection significantly reduced IL-6 release in cells exposed to either of the three tested bacterial strains by on average more than 50 %. Infection with influenza B on the other hand did not affect cytokine production in BEAS-2B cells exposed to the different bacterial strains. CONCLUSION:Pre-exposure of epithelial cells to bacteria alters the response to subsequent viral infection depending on the types of pathogen involved. These findings highlight the complexity of microbiome interactions in the airways, possibly contributing to the susceptibility to exacerbations and the natural course of airway diseases.

journal_name

Respir Res

journal_title

Respiratory research

authors

Bellinghausen C,Gulraiz F,Heinzmann AC,Dentener MA,Savelkoul PH,Wouters EF,Rohde GG,Stassen FR

doi

10.1186/s12931-016-0382-z

subject

Has Abstract

pub_date

2016-06-03 00:00:00

pages

68

issue

1

eissn

1465-9921

issn

1465-993X

pii

10.1186/s12931-016-0382-z

journal_volume

17

pub_type

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