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Related Concept Videos

Hepatic Encephalopathy01:29

Hepatic Encephalopathy

DefinitionHepatic encephalopathy is a reversible neurologic syndrome that results from advanced liver dysfunction or portosystemic shunting. It leads to disturbances in cognition, behavior, and motor function due to the brain’s exposure to gut-derived toxins that the liver fails to detoxify.EtiologyThis condition develops either in the setting of acute fulminant hepatitis or progressively during chronic liver disease, such as cirrhosis and portal hypertension. Portosystemic shunting—including...
Gut-Brain Axis01:22

Gut-Brain Axis

The gut–brain axis is a bidirectional communication system that connects the gastrointestinal tract and the brain. This interaction is mediated through multiple pathways, including the vagus nerve, hormonal signals, immune responses, and chemical messengers produced by gut microbes.Microbial Contributions to Brain FunctionGut microbiota contributes significantly to brain function by producing neuroactive compounds. These include neuroactive compounds that influence neurotransmitters such as...
Functions of the Gut Microbiota01:18

Functions of the Gut Microbiota

The gut microbiota includes trillions of microorganisms that colonize the human gastrointestinal tract, including bacteria, archaea, viruses, and fungi. This complex ecosystem plays a critical role in maintaining intestinal and systemic health. Most of these microbes inhabit the large intestine, establishing a relatively stable and diverse community that contributes to gut homeostasis through various metabolic, immunological, and protective mechanisms.Dominant bacterial phyla, such as...
Microbiota of the Large Intestine01:27

Microbiota of the Large Intestine

The large intestine hosts the most densely populated microbial ecosystem in the human body. This complex community primarily consists of anaerobic bacteria, with Bacillota (formerly Firmicutes) and Bacteroidota (formerly Bacteroidetes) as the predominant groups. The distribution of these microbes varies along different sections of the large intestine, influenced by local environmental factors such as oxygen availability and nutrient composition.The cecum, located at the beginning of the large...
Introduction to the Human Microbiota01:22

Introduction to the Human Microbiota

Microorganisms colonize various regions of the human body, including the mouth, nasal passages, throat, stomach, intestines, urogenital tract, and skin. The total number of microbial cells is estimated to range from 10¹³ to 10¹⁴—comparable to, or exceeding, the number of human somatic cells. This host–microbiome relationship has led to the conceptualization of humans as supraorganisms, wherein microbial communities perform vital roles in development, immunity, and disease...
Microbiota of the Stomach and Small Intestine01:27

Microbiota of the Stomach and Small Intestine

The human gastrointestinal (GI) tract is characterized by distinct physicochemical conditions that shape its microbial communities. Among these, the stomach presents a particularly challenging environment for microbial colonization due to its highly acidic pH, ranging from 1 to 3. This extreme acidity effectively limits microbial density. However, certain acid-tolerant microorganisms are capable of surviving in this niche. Notably, Helicobacter pylori can colonize the gastric mucosa,...

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Related Experiment Video

Updated: May 13, 2026

Therapeutic Evaluation of Fecal Microbiota Transplantation in an Interleukin 10-Deficient Mouse Model
05:41

Therapeutic Evaluation of Fecal Microbiota Transplantation in an Interleukin 10-Deficient Mouse Model

Published on: April 6, 2022

Gut microbiota and hepatic encephalopathy.

Radha K Dhiman1

  • 1Department of Hepatology, Postgraduate Institute of Medical Education and Research, Chandigarh 160012, India. rkpsdhiman@hotmail.com

Metabolic Brain Disease
|March 7, 2013
PubMed
Summary

The gut microbiome influences liver health and hepatic encephalopathy (HE). While prebiotics and probiotics show potential for treating HE by altering gut bacteria, current evidence is low quality, precluding recommendations. Further research is needed.

Area of Science:

  • Gastroenterology
  • Hepatology
  • Microbiology

Background:

  • The gut and liver share a close functional relationship via the portal venous system.
  • Alterations in gut microbiota and their by-products are implicated in the pathogenesis of hepatic encephalopathy (HE).
  • Intestinal barrier and immune dysfunction contribute to HE and systemic inflammation in liver cirrhosis.

Purpose of the Study:

  • To review the literature on the relationship between gut flora and hepatic encephalopathy (HE).
  • To explore the role of gut microbiota in the pathogenesis of HE.
  • To evaluate the potential of gut-modulating therapies, such as prebiotics and probiotics, in HE treatment.

Main Methods:

  • Literature review summarizing findings on gut flora and HE.

Related Experiment Videos

Last Updated: May 13, 2026

Therapeutic Evaluation of Fecal Microbiota Transplantation in an Interleukin 10-Deficient Mouse Model
05:41

Therapeutic Evaluation of Fecal Microbiota Transplantation in an Interleukin 10-Deficient Mouse Model

Published on: April 6, 2022

  • Analysis of the impact of gut microbiota by-products on liver function and HE development.
  • Assessment of current evidence for probiotic efficacy in HE treatment.
  • Main Results:

    • Gut microbiota dysbiosis and associated by-products (ammonia, endotoxins) are key in HE pathogenesis.
    • Prebiotics, probiotics, and synbiotics may modulate gut flora, potentially improving HE.
    • Current trials on probiotics for HE are of low quality with high risk of bias and random errors.

    Conclusions:

    • The gut-liver axis plays a critical role in hepatic encephalopathy.
    • While gut-targeted therapies show promise, current evidence for probiotics in HE treatment is insufficient.
    • High-quality randomized controlled trials are necessary to establish the efficacy of probiotics for HE.