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Functions of the Gut Microbiota

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 Intestine

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 Intestine

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,...

The Tumor Microenvironment

The Tumor Microenvironment

Every normal cell or tissue is embedded in a complex local environment called stroma, consisting of different cell types, a basal membrane, and blood vessels. As normal cells mutate and develop into cancer cells, their local environment also changes to allow cancer progression. The tumor microenvironment (TME) consists of a complex cellular matrix of stromal cells and the developing tumor. The cross-talk between cancer cells and surrounding stromal cells is critical to disrupt normal tissue...

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Introduction to the Human Microbiota

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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,...

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Related Experiment Video

Updated: Apr 11, 2026

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

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

Published on: October 15, 2019

Gut bacteria and cancer.

Susan E Erdman¹, Theofilos Poutahidis²

¹Division of Comparative Medicine, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, United States.

Biochimica Et Biophysica Acta

|June 9, 2015

Summary

The gut microbiota, outnumbering human cells, influences cancer development. Understanding gut bacteria and host responses may lead to new anti-cancer strategies promoting gastrointestinal homeostasis.

Keywords:

Breast cancer Enteric Immune system Mammary cancer Microbes Neutrophils Regulatory T cells

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Area of Science:

Microbiology
Oncology
Gastroenterology

Background:

The human gastrointestinal (GI) tract harbors a vast microbial community, significantly outnumbering host cells.
Emerging evidence suggests a link between GI tract bacteria and the development of distal cancers.
Dysregulated host interactions with enteric bacteria are implicated in extra-intestinal cancer origins.

Purpose of the Study:

To explore the role of gut microbiota in cancer development.
To investigate the connection between host responses to enteric bacteria and cancer.
To identify novel anti-cancer strategies targeting GI tract homeostasis.

Main Methods:

Analysis of antibiotic effects on cancer fate.
Review of recent data on host-microbe interactions in cancer.
Synthesis of findings to propose therapeutic approaches.

Main Results:

Antibiotic studies suggest GI tract bacteria influence distal cancer outcomes.
Host responses to enteric bacteria are linked to cancers in extra-intestinal sites.
These findings highlight the importance of the gut microbiome in cancer biology.

Conclusions:

The gut microbiota plays a critical role in cancer development and progression.
Targeting GI tract homeostasis represents a promising avenue for novel anti-cancer therapies.
Further research into host-microbe interactions is crucial for advancing cancer treatment.