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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...
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...
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,...
Mucosal Barrier of the Stomach01:25

Mucosal Barrier of the Stomach

The gastric glands contain parietal cells that secrete hydrochloric acid (HCl) for digestion. The cells secrete HCl because it is highly corrosive and essential for breaking down food. To achieve this, they secrete hydrogen and chloride ions into the lumen of the gastric glands, which combine to form HCl.
Within parietal cells, carbonic acid is first formed through the reaction of water and carbon dioxide. The dissociation of carbonic acid releases bicarbonate and hydrogen ions. The bicarbonate...
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...
Physiology of Enteric Nervous System and Gut Health01:05

Physiology of Enteric Nervous System and Gut Health

The gastrointestinal tract, responsible for the digestion and absorption of nutrients, is safeguarded by the intestinal barrier, which consists of secretory, physical, and immune components. At the forefront is the secretory barrier, composed of essential elements such as mucus, gut microbiota, and defense proteins. They collaborate to break down food particles, facilitate nutrient absorption, and maintain optimal gut health. These secretory components ensure the smooth functioning of the...

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Related Experiment Video

Updated: May 30, 2026

Development of an Antigen-driven Colitis Model to Study Presentation of Antigens by Antigen Presenting Cells to T Cells
06:57

Development of an Antigen-driven Colitis Model to Study Presentation of Antigens by Antigen Presenting Cells to T Cells

Published on: September 18, 2016

The gut microbiota and mucosal T cells.

Patrick M Smith1, Wendy S Garrett

  • 1Department of Immunology and Infectious Diseases, Harvard School of Public Health Boston, MA, USA.

Frontiers in Microbiology
|August 12, 2011
PubMed
Summary

The gut microbiota influences the development of specific intestinal immune cells. This review explores how gut microbes shape mucosal T cell subsets, including intraepithelial lymphocytes and lamina propria CD4 T cells.

Area of Science:

  • Immunology
  • Microbiology
  • Gastroenterology

Background:

  • The gut immune system and resident microbiota are closely intertwined.
  • Understanding microbial influence on immune cell development is crucial for gut health.
  • Identifying specific gut microbes that modulate immunity remains a challenge.

Purpose of the Study:

  • To review the influence of the gut microbiota on mucosal T cell development and function.
  • To highlight specific microbial species that impact intestinal immunity.
  • To focus on intraepithelial lymphocytes and lamina propria CD4 T cells.

Main Methods:

  • Literature review of existing research on gut microbiota and mucosal immunity.
  • Analysis of studies identifying immunomodulatory commensal bacteria.
Keywords:
T cellsgut microbiotamucosal immunity

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Isolation and Flow Cytometric Characterization of Murine Small Intestinal Lymphocytes

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Isolation and Characterization of Dendritic Cells and Macrophages from the Mouse Intestine
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Isolation and Characterization of Dendritic Cells and Macrophages from the Mouse Intestine

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Related Experiment Videos

Last Updated: May 30, 2026

Development of an Antigen-driven Colitis Model to Study Presentation of Antigens by Antigen Presenting Cells to T Cells
06:57

Development of an Antigen-driven Colitis Model to Study Presentation of Antigens by Antigen Presenting Cells to T Cells

Published on: September 18, 2016

Isolation and Flow Cytometric Characterization of Murine Small Intestinal Lymphocytes
08:14

Isolation and Flow Cytometric Characterization of Murine Small Intestinal Lymphocytes

Published on: May 8, 2016

Isolation and Characterization of Dendritic Cells and Macrophages from the Mouse Intestine
09:25

Isolation and Characterization of Dendritic Cells and Macrophages from the Mouse Intestine

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  • Synthesis of findings on T cell subset differentiation influenced by microbes.
  • Main Results:

    • Specific commensal bacteria have been identified as key players in immune modulation.
    • Gut microbes significantly impact the differentiation and function of intestinal T cells.
    • Intraepithelial lymphocytes and lamina propria CD4 T cells show dependence on microbial cues.

    Conclusions:

    • The gut microbiota is essential for the proper development and function of intestinal immune cells.
    • Targeting specific gut microbes may offer therapeutic strategies for immune-related gut disorders.
    • Further research is needed to fully elucidate the complex host-microbe interactions in the gut.