Related Experiment Video
Updated: Mar 25, 2026
06:58
Analysis of Interactions between Endobiotics and Human Gut Microbiota Using In Vitro Bath Fermentation Systems
Published on: August 23, 2019
7.7K
Chemical conversations in the gut microbiota
Jessica A Thompson1, Rita A Oliveira1, Karina B Xavier1
1a Instituto Gulbenkian de Ciência , Oeiras , Portugal.
Gut Microbes
|February 23, 2016
Summary
Quorum sensing signals like autoinducer-2 (AI-2) can reshape the gut microbiota after antibiotic disruption. This bacterial communication may restore microbial balance and improve host health.
Area of Science:
- Microbiology
- Host-Microbe Interactions
- Bacterial Communication
Background:
- The gut microbiota is crucial for host health, but antibiotic use disrupts its composition and interactions.
- Bacterial quorum sensing (QS), regulating group behaviors via chemical signals, is understudied in gut microbiota dynamics.
- Autoinducer-2 (AI-2) is an interspecies QS signal with potential roles in microbiota structure modulation.
Purpose of the Study:
- To explore the role of AI-2 in modulating gut microbiota structure and function.
- To investigate how AI-2 influences bacterial interactions and community balance post-antibiotic treatment.
- To assess the potential of AI-2 as a therapeutic agent for microbiota dysbiosis.
Main Methods:
- Utilizing Escherichia coli to manipulate AI-2 signal levels within the gut microbiota.
- Analyzing changes in microbiota composition, particularly the balance between Bacteroidetes and Firmicutes.
- Investigating the impact of AI-2 on bacterial behaviors and interspecies interactions.
Main Results:
- AI-2 signaling was shown to modulate the gut microbiota structure.
- Manipulation of AI-2 levels influenced the balance of major bacterial phyla (Bacteroidetes and Firmicutes).
- AI-2 mediated changes suggest a role in restoring microbial community homeostasis.
Conclusions:
- AI-2 signaling represents a key mechanism influencing gut microbiota resilience and composition.
- Targeting AI-2 pathways could offer novel strategies for treating antibiotic-induced dysbiosis.
- AI-2 has broad potential for restoring microbiota balance in various diseases.
Related Concept Videos
01:18Functions of the Gut Microbiota
19
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...
19
01:27Microbiota of the Stomach and Small Intestine
17
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,...
17
01:27Microbiota of the Large Intestine
12
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...
12
01:25Microbial Interactions: Mutualism
20
Mutualism is a symbiotic interaction in which all participating organisms benefit. These relationships can be obligate or facultative and are fundamental to ecosystem functions across diverse biological systems.Plant–Fungi MutualismOne well-known example is the association between plant roots and mycorrhizal fungi, such as Rhizophagus species. The fungal hyphae penetrate the root hairs and the epidermis, forming an extensive hyphal network that establishes a symbiotic association. Through...
20
01:22Gut-Brain Axis
39
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...
39
01:29Bacterial Flora of the Large Intestine
1.9K
The gut microbiome is formed by a vast and diverse community of bacteria that colonizes our large intestine. These bacteria start residing in the gut from birth and continue diversifying throughout life, influenced by factors such as diet, lifestyle, and stress. The gut bacterial community also includes bacteria from food and those that enter the colon through the anus.
The normal gut flora of the colon plays a critical role in generating essential vitamins such as vitamins K, B5, and B7.
The normal gut flora of the colon plays a critical role in generating essential vitamins such as vitamins K, B5, and B7.
1.9K