Integrative study of pulmonary microbiome, transcriptome and clinical outcomes in Mycoplasma pneumoniae pneumonia

Area of Science:

• Pediatric Respiratory Medicine
• Microbiome Research
• Immunology

Background:

• Mycoplasma pneumoniae pneumonia (MPP) is a common childhood respiratory infection.
• Understanding the interplay between pathogen, lung microbiome, and host response is crucial for managing MPP.
• Distinct clinical presentations, general MPP (GMPP) and complicated MPP (CMPP), suggest underlying biological differences.

Purpose of the Study:

• To investigate the interactions among pathogen, lung microbiome, and host response in pediatric MPP.
• To correlate these interactions with disease severity and clinical outcomes.
• To differentiate these elements between general and complicated forms of MPP.

Main Methods:

• Prospective collection of bronchoalveolar lavage fluid from 41 children with MPP.
• Microbiome and transcriptomic analyses of lung fluid.
• Correlation of findings with clinical features and outcomes, distinguishing between GMPP and CMPP.

Main Results:

• Complicated MPP (CMPP) exhibited an increased relative abundance of Mycoplasma pneumoniae (MP) and reduced lung microbiome diversity.
• Host gene analysis identified key modules related to neutrophil function and inflammatory pathways.
• A specific lung microbiome and host response profile associated with high MP abundance correlated with CMPP and prolonged imaging recovery.

Conclusions:

• Patients with CMPP present with a more disrupted lung microbiome compared to GMPP.
• Interactions between MP, the lung microbiome, and host response are intrinsically linked to MPP severity and outcomes in children.
• These findings highlight potential therapeutic targets for improving pediatric MPP management.