16HBE Cell Lipid Mediator Responses to Mono and Co-Infections with Respiratory Pathogens

Area of Science:

• Molecular Biology
• Immunology
• Infectious Diseases

Background:

• Respiratory tract infections pose a global health challenge, primarily caused by influenza A virus (IAV), Staphylococcus aureus (S. aureus), and Streptococcus pneumoniae (S. pneumoniae).
• Eicosanoids and oxylipins are crucial host-derived lipid mediators involved in regulating inflammatory responses.
• Current research often emphasizes host genetics and immune responses in these infections.

Purpose of the Study:

• To investigate, for the first time, the intracellular profiles of bioactive lipid mediators during infections with S. aureus, S. pneumoniae, and IAV in 16HBE cells.
• To analyze lipid mediator changes during single and co-infections, including viral-bacterial co-infections.

Main Methods:

• Utilized 16HBE cells as an in vitro model for respiratory tract infections.
• Infected cells with S. aureus LUG2012, S. pneumoniae TIGR4, and IAV, as well as combinations thereof.
• Analyzed intracellular profiles of various bioactive lipid mediators, including eicosanoids and oxylipins.

Main Results:

• Observed a wide range of altered lipid mediators across different infection types.
• Significant changes in 5-hydroxyeicosatetraenoic acid (5-HETE) levels were prominent in all bacterial infections.
• Streptococcus pneumoniae infection demonstrated the most substantial impact on bioactive lipid production, altering PPARγ ligands and pro-resolving lipid mediator precursors.

Conclusions:

• Bacterial and viral respiratory pathogens induce distinct intracellular lipid mediator profiles.
• Streptococcus pneumoniae infection profoundly affects lipid mediator pathways crucial for inflammation resolution.
• These findings highlight the role of lipid mediators in the host response to respiratory infections and suggest potential therapeutic targets.