Commensal Bacteria
Commensal Bacteria - Related Videos
04:45
Swab-based Conjunctival Commensal Bacteria Isolation: A Technique to Isolate Commensal Bacteria from Conjunctiva of Murine Model
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2025
This video describes a swab-based technique to isolate viable commensal bacteria from the ocular conjunctiva. The technique can be used to profile the commensal bacterial microbiome of the conjunctiva, which plays a defensive role against pathogens.
07:02
Quantifying Human Norovirus Virus-like Particles Binding to Commensal Bacteria Using Flow Cytometry
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Cited by 8 •
2020
The goal of this protocol is to quantify binding of the eukaryotic pathogen human norovirus to bacteria. After performing an initial virus-bacterium attachment assay, flow cytometry is used to detect virally-bound bacteria within the population.
12:25
Microfluidic Co-culture of Epithelial Cells and Bacteria for Investigating Soluble Signal-mediated Interactions
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Cited by 17 •
2010
This protocol describes a microfluidic co-culture model for simultaneous and localized culture of epithelial cells and bacteria. This model can be used for investigating the role of different soluble molecular signals on pathogenesis as well as screen the effectiveness of putative probiotic bacterial strains.
07:52
Conjunctival Commensal Isolation and Identification in Mice
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2021
Presented here is a protocol for the isolation and amplification of aerobic and facultative anaerobic mouse conjunctival commensal bacteria using a unique eye swab and culture-based enrichment step with subsequent identification by microbiological based methods and MALDI-TOF mass spectrometry.
07:20
Human Colonoid Monolayers to Study Interactions Between Pathogens, Commensals, and Host Intestinal Epithelium
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Cited by 45 •
2019
Here, we present a protocol to culture human enteroid or colonoid monolayers that have intact barrier function to study host epithelial-microbiota interactions at the cellular and biochemical level.
FAQs
Their interactions with epithelial cells and immune pathways can support barrier integrity, helping body surfaces maintain a protective interface with the surrounding environment. These interactions also affect immune function, linking microbial colonization with host responses. In immunology research, this relationship is important because changes in barrier support or immune signaling may alter susceptibility to infection and inflammatory disease.
Commensal bacteria can make colonization more difficult for pathogens by competing for nutrients and attachment sites. This competition reduces opportunities for invading microorganisms to establish themselves on body surfaces. Studying these interactions helps explain why disruption of resident microbial communities may increase infection susceptibility and why restoring the microbiota is considered in approaches to infection prevention.
The effects of metabolites produced by commensal bacteria depend on environmental conditions and the surrounding host context. Under some conditions, these products can promote immune tolerance, while under others they may contribute to inflammatory responses. This flexibility helps explain why the same microbial community can be associated with different immune outcomes during health, disruption, or infection.
Antibiotic-associated disruption can alter the microbial community that supports barrier integrity, competes with pathogens, and influences immune pathways. As these protective functions change, susceptibility to disease may increase. Research therefore examines both the consequences of microbiota disruption and the process of recovery, connecting antibiotic exposure with colonization resistance and infection risk.
Studies commonly examine how resident microbial communities affect colonization resistance, host immune function, susceptibility to disease, and responses to antibiotic-associated disruption. Researchers also consider whether the microbiota recovers after disturbance. Together, these questions connect microbial community behavior with mechanisms that either limit pathogen establishment or contribute to altered infection outcomes.
They provide a framework for examining how microbial communities communicate with epithelial cells and immune pathways while influencing barrier integrity and inflammatory balance. This subject connects normal host physiology with infection susceptibility, particularly when antibiotics disrupt the microbiota. It also supports research into strategies designed to prevent or treat infection by modifying microbial community function.
These approaches are studied because changing or supporting microbial communities may help restore functions affected by disruption, including competition with pathogens, maintenance of barrier integrity, and regulation of immune responses. Their relevance lies in addressing the microbiota as part of infection management rather than focusing only on the invading pathogen or the host response separately.
Recovery matters because a restored microbial community may regain functions that help protect the host, including competition for nutrients and attachment sites, support of epithelial barriers, and regulation of immune activity. Tracking recovery therefore helps researchers evaluate whether antibiotic-associated changes are temporary or whether altered community function could continue to influence susceptibility to disease.