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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...
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...
Defense Against Bacterial Pathogens01:31

Defense Against Bacterial Pathogens

The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
Inflammatory Bowel Disease III: Crohn's Disease01:25

Inflammatory Bowel Disease III: Crohn's Disease

Crohn’s disease is a chronic, relapsing form of inflammatory bowel disease characterized by segmental, transmural inflammation that can affect any part of the gastrointestinal tract. Its pathogenesis arises from a combination of genetic susceptibility, environmental exposures, epithelial barrier dysfunction, and immune dysregulation. Together, these factors lead to an exaggerated immune response against components of the gut microbiome.Genetic and Environmental InfluencesMultiple genetic...
Inflammatory Bowel Disease II: Ulcerative Colitis01:20

Inflammatory Bowel Disease II: Ulcerative Colitis

Ulcerative colitis is a chronic inflammatory disorder of the colon characterized by continuous mucosal inflammation that typically begins in the rectum and extends proximally in a uniform pattern. Its pathogenesis involves a complex interplay of genetic predisposition, immune dysregulation, and environmental influences. These factors converge to impair the colon’s epithelial defenses and promote an exaggerated inflammatory response against luminal contents.Breakdown of the Mucosal BarrierA...
Humoral Immune Responses01:36

Humoral Immune Responses

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Related Experiment Video

Updated: May 23, 2026

Injections of Lipopolysaccharide into Mice to Mimic Entrance of Microbial-derived Products After Intestinal Barrier Breach
08:24

Injections of Lipopolysaccharide into Mice to Mimic Entrance of Microbial-derived Products After Intestinal Barrier Breach

Published on: May 2, 2018

Immunological responses to gut bacteria.

Julia M Green-Johnson1

  • 1University of Ontario Institute of Technology, Faculty of Science, 2000 Simcoe St, Oshawa, ON, Canada L1H 7K4. Julia.Green-Johnson@uoit.ca

Journal of AOAC International
|April 4, 2012
PubMed
Summary
This summary is machine-generated.

The gut microbiota profoundly influences the immune system and host defenses. This review explores the complex, bidirectional relationship between gut microbes and the host immune system.

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An Intestinal Gut Organ Culture System for Analyzing Host-Microbiota Interactions
05:27

An Intestinal Gut Organ Culture System for Analyzing Host-Microbiota Interactions

Published on: June 30, 2021

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Last Updated: May 23, 2026

Injections of Lipopolysaccharide into Mice to Mimic Entrance of Microbial-derived Products After Intestinal Barrier Breach
08:24

Injections of Lipopolysaccharide into Mice to Mimic Entrance of Microbial-derived Products After Intestinal Barrier Breach

Published on: May 2, 2018

An Intestinal Gut Organ Culture System for Analyzing Host-Microbiota Interactions
05:27

An Intestinal Gut Organ Culture System for Analyzing Host-Microbiota Interactions

Published on: June 30, 2021

Area of Science:

  • Immunology
  • Microbiology
  • Gastroenterology

Background:

  • The gut microbiota plays a crucial role in host health, particularly in modulating immune responses.
  • Host-microbe interactions are complex and dynamic, impacting various physiological processes.

Purpose of the Study:

  • To review the adaptive and innate immune responses to the gut microbiota.
  • To highlight the bidirectional nature of host-microbe interactions.

Main Methods:

  • Literature review of current research on gut microbiota and host immunity.
  • Synthesis of findings on immune cell activation and signaling pathways.

Main Results:

  • Gut microbiota extensively shapes both innate and adaptive immunity.
  • Immune responses are tailored to specific microbial communities and their metabolites.

Conclusions:

  • Understanding host-microbe interactions is vital for immune system regulation.
  • Targeting the gut microbiota offers therapeutic potential for immune-related diseases.