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Mechanisms of dysfunction

The sepsis-permeability feedback loop

Hypothesis Mechanism review
barrier microbiome inflammation dysbiosis sepsis mechanism intestinal integrity
Editor's note
Sepsis doesn't just cause intestinal leakage—it creates a self-amplifying cycle where barrier damage and microbial dysbiosis reinforce each other, lowering the threshold for recurrent infection. This reframes sepsis management from acute crisis response to a chronic mucosal repair problem, positioning inter-episode recovery as equally critical to in-hospital treatment. Intensivists, gastroenterologists, and microbiome researchers should reassess sepsis survivorship protocols accordingly.

"Leaky gut → sepsis" is not a one-way mechanism. It is a self-reinforcing cycle.

Both leaky gut (barrier defect at intestinal surface) and gut dysbiosis are intrinsic to sepsis. While sepsis itself can cause dysbiosis, dysbiosis can worsen sepsis. Leaky gut allows translocation of microbial molecules from intestine into blood circulation.

Sepsis-induced dysbiosis (driven by defective intestinal immunity, antibiotics, and changes in fungi and phages) facilitates intestinal translocation of microbial molecules or viable organisms, which causes systemic inflammation that further compromises intestinal integrity and induces dysbiosis in a vicious cycle.

Each sepsis episode damages the epithelium (hypoperfusion + enterocyte apoptosis); each antibiotic round alters microbiota, often losing key anaerobes (Faecalibacterium, Roseburia, Akkermansia); loss of short-chain fatty acid producers reduces goblet cell fuel and MUC2 quality; the threshold for the next episode drops.

Recovery between episodes is at least as important as treatment during them.

Related articles in this corpus

Parallel
The integrated mechanistic model
Both articles describe self-reinforcing loops in mucosal disease (sepsis vs. generalized dysbiosis) initiated by barrier defects, but Article A focuses on leaky gut and immune dysfunction while Article B focuses on mucin glycosylation defects as the primary lesion.
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Bile acids as signaling molecules — FXR and TGR5
Article B identifies a specific molecular mechanism (bile acid signaling via FXR/TGR5) that could therapeutically interrupt the sepsis-permeability feedback loop described in Article A by restoring intestinal barrier function.
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The glycocalyx and heparan sulfate / syndecan-1
Article B identifies a specific molecular mechanism (heparan sulfate/syndecan-1 loss) underlying the barrier defect that Article A describes as the initiating event in the sepsis-permeability feedback loop.
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The mucin barrier — architecture
Article B provides mechanistic detail on the intestinal barrier architecture (mucin layers and regional differences) that underpins the leaky gut component central to Article A's sepsis-permeability feedback loop.
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Combined heat and exercise stress disrupt gut microbiota and promote microbial translocation
Both articles examine how physiological stress (sepsis in A, heat+exercise in B) disrupts gut barrier integrity and microbiota, leading to microbial translocation, but focus on different stress mechanisms and contexts.
Published 2026-05-24 · Last kit-update 2026-05-24