Related Experiment Video

Updated: Jun 20, 2026

Analysis of Interactions between Endobiotics and Human Gut Microbiota Using In Vitro Bath Fermentation Systems
06:58

Analysis of Interactions between Endobiotics and Human Gut Microbiota Using In Vitro Bath Fermentation Systems

Published on: August 23, 2019

Intestinal microbiota regulate xenobiotic metabolism in the liver

Britta Björkholm1, Chek Mei Bok, Annelie Lundin

  • 1Department of Microbiology, Tumor and Cell biology, Karolinska Institutet, Stockholm, Sweden.

Plos One
|September 11, 2009
PubMed
Abstract

Insights

Gut microbiota significantly impacts liver function and drug metabolism. Germ-free mice exhibit more efficient xenobiotic metabolism compared to conventionally-raised mice, demonstrating microbiota

Area of Science:

  • Hepatology
  • Microbiology
  • Pharmacology

Background:

  • The liver is a primary site for xenobiotic metabolism (XM), with nuclear receptors like CAR and PXR regulating drug metabolism.
  • Gut microbiota's influence on liver gene expression and xenobiotic metabolism, particularly in response to barbiturates, is under investigation.

Purpose of the Study:

  • To investigate how gut microbiota influences hepatic gene expression and xenobiotic metabolism.
  • To determine the effect of gut microbiota on the metabolism of drugs like barbiturates.

Main Methods:

  • Comparative analysis of hepatic gene expression using microarrays in germ-free (GF) and specific-pathogen-free (SPF) mice.
  • Functional validation through exposure of GF and SPF mice to pentobarbital to assess xenobiotic metabolism efficiency.

Main Results:

  • Identified 112 differentially expressed genes in the liver, primarily related to xenobiotic metabolism and RXR function inhibition.
  • Germ-free mice demonstrated significantly more efficient xenobiotic metabolism, indicated by a shorter anesthesia duration with pentobarbital, compared to SPF mice.

Conclusions:

  • Gut microbiota plays a crucial role in modulating hepatic gene expression and xenobiotic metabolism.
  • Microbiota influences the liver's response to drugs even without direct hepatic contact.

More Related Videos

An In Vitro Batch-culture Model to Estimate the Effects of Interventional Regimens on Human Fecal Microbiota07:15

An In Vitro Batch-culture Model to Estimate the Effects of Interventional Regimens on Human Fecal Microbiota

Published on: July 31, 2019

Related Concept Videos

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 Modulation by Antibiotics01:21

Microbiota Modulation by Antibiotics

Antibiotics have revolutionized modern medicine by saving countless lives from bacterial infections. However, their widespread use has inadvertently harmed the delicate balance of the human gut microbiota. The gut microbiota, a complex community of bacteria, archaea, viruses, and fungi, plays a vital role in regulating metabolism, immune responses, and maintaining intestinal health. Antibiotics, especially broad-spectrum types, disrupt this ecosystem by eradicating both harmful and beneficial...
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...
Drug Elimination: Non-Renal Routes01:23

Drug Elimination: Non-Renal Routes

The liver plays a pivotal role in eliminating drugs and their metabolites, primarily through a process known as biliary excretion. This process involves the hepatocytes, the primary cells in the liver that generate bile. A range of transporters actively expels polar drugs or hydrophilic drug metabolites into the bile, which transports the drugs and metabolites into the small intestine. From here, they are eventually expelled from the body through feces. In some instances, the original drug or a...
Dysbiosis of the Gut Microbiota01:18

Dysbiosis of the Gut Microbiota

The human gut microbiome includes a diverse array of microbial species, including beneficial commensals and opportunistic pathogens, which interact to support host health. These microbes contribute to essential functions such as nutrient metabolism, immune system modulation, and maintenance of intestinal barrier integrity. However, disruptions to this equilibrium—referred to as dysbiosis—can have widespread physiological consequences.Dysbiosis is often characterized by reduced microbial...
Pharmacogenetics of Drug Metabolism: Overview01:27

Pharmacogenetics of Drug Metabolism: Overview

Genetic polymorphism in drug metabolism is crucial to the inter-individual variability observed in drug responses. Drug metabolism primarily involves the chemical modification of drugs and other xenobiotics to enhance their elimination by increasing their polarity. Two main classes of enzymes mediate this biotransformation process: Phase I enzymes, primarily cytochrome P450s, catalyze oxidation and reduction reactions, while other enzymes, such as esterases, mediate hydrolysis, and Phase II...