Microbial uptake by the respiratory epithelium: outcomes for host and pathogen

Area of Science:

• Immunology
• Microbiology
• Cell Biology

Background:

• The respiratory epithelium plays a dual role in host defense against inhaled pathogens, acting as both a barrier and an active participant in microbial clearance.
• While intracellular pathogen occupancy is a known pathogenic strategy, the role of airway epithelial cells (AECs) in actively ingesting and controlling microbes is increasingly recognized.

Purpose of the Study:

• To comprehensively survey current knowledge on the uptake of bacterial and fungal pathogens by airway epithelial cells (AECs).
• To elucidate the beneficial and detrimental activities of respiratory epithelia during antimicrobial defense.
• To identify key infection scenarios and understand the impact of AEC-mediated pathogen clearance on disease severity.

Main Methods:

• Systematic review and comprehensive survey of existing literature on airway epithelial cell interactions with microbial pathogens.
• Analysis of host-microbe interactions, focusing on the mechanisms of microbial uptake by AECs.
• Identification and characterization of distinct infection scenarios based on pathogen type and host response.

Main Results:

• Microbial uptake by AECs is a common interaction in respiratory infections, with mechanisms and outcomes varying significantly by pathogen.
• Four key infection scenarios were identified, illustrating diverse host-pathogen dynamics.
• The efficiency of AEC-mediated pathogen clearance inversely correlates with respiratory disease severity.

Conclusions:

• AEC-mediated pathogen uptake is a critical but complex aspect of respiratory host-microbe interactions.
• Subversion of AEC functions by pathogens contributes to disease progression.
• Further research into the antimicrobial properties of respiratory epithelia and the factors influencing pathogen entry and intracellular fate is warranted.