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Colonisation of Pathogens01:25

Colonisation of Pathogens

Pathogen colonization of host tissues is a critical step in the development of infectious diseases. Various pathogenic microorganisms, including bacteria, fungi, viruses, and protozoa, have evolved complex strategies to attach to, invade, and persist within host environments. These mechanisms enable pathogens to establish infections, evade immune responses, and resist antimicrobial treatments.Attachment to Host CellsIn bacteria, colonization typically begins with adherence to host epithelial...
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An Intestinal Gut Organ Culture System for Analyzing Host-Microbiota Interactions
05:27

An Intestinal Gut Organ Culture System for Analyzing Host-Microbiota Interactions

Published on: June 30, 2021

Intestinal colonization resistance.

Trevor D Lawley1, Alan W Walker

  • 1Bacterial Pathogenesis Laboratory, Wellcome Trust Sanger Institute, Hinxton, UK. tl2@sanger.ac.uk

Immunology
|December 18, 2012
PubMed
Summary
This summary is machine-generated.

The healthy gut microbiota prevents pathogen invasion through a process called colonization resistance. This involves a balanced immune system and a diverse gut microbial community, crucial for maintaining intestinal health.

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An Intestinal Gut Organ Culture System for Analyzing Host-Microbiota Interactions
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Isolation and Identification of Waterborne Antibiotic-Resistant Bacteria and Molecular Characterization of their Antibiotic Resistance Genes
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Isolation and Identification of Waterborne Antibiotic-Resistant Bacteria and Molecular Characterization of their Antibiotic Resistance Genes

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Area of Science:

  • Microbiology
  • Immunology
  • Gastroenterology

Background:

  • The mammalian intestinal tract harbors dense, complex microbial communities known as the microbiota.
  • A healthy microbiota provides 'colonization resistance,' inhibiting pathogen overgrowth and maintaining intestinal homeostasis.
  • Colonization resistance is linked to a stable, diverse microbiota and controlled inflammation via microbe-host interactions.

Purpose of the Study:

  • To overview the microbial ecology of the healthy mammalian intestinal tract.
  • To highlight microbe-microbe and microbe-host interactions that promote colonization resistance.
  • To discuss signatures of intestinal health and colonization resistance.

Main Methods:

  • Literature review and synthesis of existing research on gut microbiota and colonization resistance.
  • Analysis of immunological, microbiota, and metabolic factors associated with intestinal health.
  • Examination of pathogen strategies to overcome colonization resistance.

Main Results:

  • A diverse and abundant microbiota, balanced T helper type 17/regulatory T-cell immune responses, and sufficient short-chain fatty acids are key signatures of colonization resistance.
  • Intestinal pathogens exploit virulence factors or antibiotic use to disrupt this balance and trigger inflammation.
  • Specific microbe-microbe and microbe-host interactions are critical for maintaining a healthy intestinal ecosystem.

Conclusions:

  • A holistic understanding of the intestinal ecosystem, integrating immunological and microbiological aspects, is essential.
  • Developing immunomodulatory and microbe-modulatory therapies can promote intestinal homeostasis and enhance colonization resistance.
  • Targeting these interactions offers a promising avenue for therapeutic interventions against intestinal infections.