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Liver transplantation (LT) significantly improves gut microbial diversity and function, reducing endotoxemia and improving ammonia and bile acid metabolism. This enhances patient outcomes and cognitive function post-transplant.

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Area of Science:

  • Gastroenterology and Hepatology
  • Microbiome Research
  • Transplantation Science

Background:

  • Liver transplantation (LT) is known to improve patient daily function and gut microbial composition.
  • However, the impact of LT on gut microbial functionality and its relation to patient benefit remains unclear.
  • Understanding these functional changes is crucial for optimizing post-LT care.

Purpose of the Study:

  • To investigate the effect of LT on gut microbial functionality.
  • Focus areas included endotoxemia, bile acid (BA) metabolism, ammonia metabolism, and lipidomics.
  • To correlate these functional changes with patient outcomes, including cognitive function.

Main Methods:

  • Prospective study of outpatient cirrhotic patients awaiting LT.
  • Collected data on microbiota composition, serum endotoxin, urinary metabolomics, serum lipidomics, and stool BA profiles before and 6 months after LT.
  • Cognitive tests were performed at both time points.

Main Results:

  • LT led to significant improvements in cognition, increased microbial diversity, and reduced potentially pathogenic bacteria.
  • Endotoxemia decreased, while stool bile acids (BAs) and evidence of bacterial action on BAs increased post-LT.
  • Serum ammonia levels reduced, accompanied by changes in urinary metabolites and a beneficial shift in the serum lipidomic profile.

Conclusions:

  • Liver transplantation significantly improves gut microbiota diversity and function in patients with cirrhosis.
  • These microbial changes are associated with favorable alterations in endotoxemia, BA metabolism, ammonia handling, and lipidomics.
  • The enhanced microbial functionality post-LT contributes to improved patient outcomes and daily function.