Intestinal blood vessel-associated macrophages and gut-vascular barrier dysfunction in cirrhosis.

Vascular macrophage dysfunction causes bacterial translocation in cirrhosis, with 20-week murine models showing impaired gut-vascular interactions and increased systemic bacterial spread.

• Why it matters: Understanding the mechanisms of intestinal barrier failure in cirrhosis is crucial because bacterial translocation leads to infections, organ failure, and higher mortality, yet the specific cellular contributors remain unclear.
• What they did: Researchers used a chronic carbon tetrachloride-induced cirrhosis model and patient biopsies, performing single-cell transcriptomics on myeloid cells to identify macrophage-related pathway disruptions.
• The result: Findings reveal that dysfunctional gut-vascular macrophages fail to clear bacteria, and their depletion promotes bacterial dissemination, highlighting their vital role in maintaining intestinal barrier integrity in cirrhosis.