The “Immune Rebellion” from the Intestines to the Liver: A Vicious Cycle That Causes the Liver to Collapse

TL;DR

The gut and liver interact through an immune cycle that can worsen liver diseases like hepatitis and cancer.

Contribution

The paper reveals how gut immune dysfunction triggers a self-reinforcing cycle that damages the liver.

Findings

Disruption of the gut immune microenvironment leads to liver disease progression.

Inflammatory signals from the gut overwhelm the liver's immune regulation.

Modulating gut immunity may delay liver disease progression.

Abstract

The gut immune microenvironment and the liver engage in intricate information exchange via the gut–liver axis. The disruption of these interactions plays a pivotal role in the formation and exacerbation of pathological damage to the liver. The gut immune microenvironment is not an independent layer of the gut barrier; rather, it permeates and regulates all other barrier functions, serving as the core coordinator. Disruption of the immune microenvironment in the gut–liver axis drives progression across the full disease spectrum—from steatosis to hepatitis, fibrosis, and even liver cancer—through the continuous influx of immune-stimulatory signals that overwhelm the liver’s intrinsic immune regulatory mechanisms. Dysfunction of innate immunity components, amplification of inflammatory factors and key cellular signaling pathways, activation of adaptive immune T cells, and systemic effects mediated by liver-derived inflammatory factors collectively form a disordered immune microenvironment. This damages the intestinal barrier and exacerbates liver disease via the gut–liver axis, leading to further intestinal injury, thus establishing a self-reinforcing vicious cycle. Current therapeutic strategies based on modulating the gut–liver axis microenvironment remain limited, yet studies have demonstrated that suppressing gut immune cells, cytokines, and signaling pathways can help delay liver disease progression. Hopefully, future combined, precise, and cutting-edge gut immunotherapies will provide more effective strategies for liver disease treatment.

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