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Related Concept Videos

Probiotics01:22

Probiotics

Probiotics are live, non-pathogenic microorganisms that confer health benefits by modulating the gut microbiota. The human gastrointestinal tract harbors a complex microbial ecosystem, and the balance of this microbiota is crucial for digestive and systemic health. Among the most extensively studied and utilized probiotics are species formerly classified within the genera Lactobacillus and Bifidobacterium. These organisms not only naturally colonize the human gut but are also consumed through...
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 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,...
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...
Irritable Bowel Syndrome I: Introduction01:17

Irritable Bowel Syndrome I: Introduction

Irritable Bowel Syndrome (IBS) is characterized by functional disturbances in the gastrointestinal system, presenting a cluster of symptoms without evident structural or biochemical abnormalities. It primarily affects the large intestine and may cause abdominal pain, bloating, excessive gas, diarrhea, constipation, or both.
IBS is a chronic condition that can persist over a long period or recur frequently.
The pathogenesis of IBS involves a complex interplay of the following factors:
Altered...
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...

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Related Experiment Video

Updated: May 26, 2026

Microbiota Analysis Using Two-step PCR and Next-generation 16S rRNA Gene Sequencing
11:22

Microbiota Analysis Using Two-step PCR and Next-generation 16S rRNA Gene Sequencing

Published on: October 15, 2019

Microbes, intestinal inflammation and probiotics.

Mohammad W Khan1, Amod A Kale, Praveen Bere

  • 1The Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA. mohammad-khan@northwestern.edu

Expert Review of Gastroenterology & Hepatology
|December 14, 2011
PubMed
Summary

Inflammatory bowel disease (IBD) disrupts the gut's balance. This review explores how gut cells, bacteria, and immune cells interact, and if genetically modified probiotics can reduce IBD inflammation.

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Published on: May 2, 2018

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Last Updated: May 26, 2026

Microbiota Analysis Using Two-step PCR and Next-generation 16S rRNA Gene Sequencing
11:22

Microbiota Analysis Using Two-step PCR and Next-generation 16S rRNA Gene Sequencing

Published on: October 15, 2019

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

Area of Science:

  • Gastroenterology
  • Immunology
  • Microbiology

Background:

  • Inflammatory bowel disease (IBD) disrupts intestinal homeostasis.
  • IBD involves complex interactions between the immune system, intestinal epithelium, and gut microbiota.
  • Understanding these intricate relationships is crucial for developing effective treatments.

Purpose of the Study:

  • To review the interplay between intestinal epithelial cells, bacteria, and innate immunity in IBD.
  • To discuss the potential of genetically modified probiotic bacteria in mitigating IBD-related inflammation.

Main Methods:

  • Literature review focusing on IBD pathogenesis.
  • Analysis of immune responses involving macrophages, dendritic cells, and epithelial cells.
  • Exploration of microbial and genetic interventions for IBD.

Main Results:

  • Intestinal macrophages, dendritic cells, and epithelial cells form a key triad governing immune responses.
  • The gut microbiota plays a critical role in initiating and modulating intestinal inflammation.
  • Genetic modification of probiotics presents a potential therapeutic avenue for IBD.

Conclusions:

  • The intricate crosstalk between host and microbial factors is central to IBD.
  • Targeting these interactions, potentially through engineered probiotics, offers promising strategies for managing IBD.