The lung microbiome in lung transplantation

Area of Science:

• Microbiology
• Immunology
• Transplantation Science

Background:

• The lung microbiome, encompassing bacteria, fungi, and viruses, is crucial in the post-lung transplant environment.
• Unique lung features influence microbial dynamics, affected by donor factors, recipient health, and immunosuppression.
• Post-transplant lung microbiomes are typically dysbiotic, characterized by increased biomass and altered composition compared to healthy lungs.

Purpose of the Study:

• To review current understanding of the lung microbiome in lung transplant recipients.
• To explore interactions between the lung microbiome and host factors post-transplantation.
• To discuss the microbiome's role in complications such as chronic lung allograft dysfunction (CLAD) and identify research gaps.

Main Methods:

• Culture-independent studies analyzing the lower respiratory tract microbiome.
• Review of existing literature on lung transplant recipients and their associated microbiomes.
• Analysis of factors influencing the lung microbiome, including immunosuppression and allograft status.

Main Results:

• The lung microbiome in transplant patients is significantly altered (dysbiotic) compared to healthy individuals.
• Increased microbial biomass and changes in microbial composition are characteristic findings.
• Emerging evidence suggests links between specific microbiome profiles and host immune responses and clinical outcomes.

Conclusions:

• The lung microbiome plays a significant role in the post-lung transplant landscape.
• Dysbiosis is a common feature, potentially impacting transplant success and complications like CLAD.
• Further research is needed to fully elucidate microbiome-host interactions and therapeutic potential.