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Related Concept Videos

Bacterial Toxins01:12

Bacterial Toxins

Bacterial toxins are sophisticated virulence factors that enable pathogenic bacteria to interact with, invade, and damage host tissues. These toxins fall broadly into two types: protein exotoxins, which are secreted into the environment and target specific host receptors, and lipopolysaccharide endotoxins, which are structural components of the bacterial outer membrane released primarily during bacterial lysis or membrane shedding. Exotoxins generally act more selectively, binding to cell...
Regulation of Bacterial Virulence01:28

Regulation of Bacterial Virulence

Pathogenic bacteria employ a range of regulatory mechanisms to modulate the expression of virulence genes in response to environmental and host-derived signals. These mechanisms ensure that virulence factors are expressed only under favorable conditions, thereby optimizing infection and survival strategies.Mechanisms of Virulence RegulationKey regulatory strategies include:Two-Component Systems: These consist of a membrane-bound sensor kinase and a cytoplasmic response regulator. Environmental...
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Bacterial Gastroenteritis

Bacterial gastroenteritis, characterized by diarrhea, abdominal cramps, and vomiting, is often caused by ingestion of contaminated food or water and is frequently associated with pathogenic Escherichia coli strains. These microbes exploit two principal mechanisms to inflict disease.Shiga toxin–producing E. coli, also referred to as STEC—notably O157:H7—release Shiga toxins that target ribosomes, blocking protein synthesis. The B subunit of the toxin binds the host glycolipid receptor...

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Analysis of the Epithelial Damage Produced by Entamoeba histolytica Infection
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Attenuating ETEC virulence using a heat-labile enterotoxin-blocking binding protein.

Marcus Petersson1,2, Jens Sivkær Pettersen3, Helena Bay Henriksen1,2

  • 1Department of Biotechnology and Biomedicine, Technical University of Denmark, Kgs. Lyngby, Denmark.

Gut Microbes
|December 19, 2025
PubMed
Summary

New VHH antibodies target bacterial toxins to prevent enteric pathogen colonization and reduce diarrhea. This approach could improve gut health for vulnerable populations.

Keywords:
Enterotoxigenic Escherichia coliVibrio choleraebinding proteinscholera toxingastrointestinal infectionsheat-labile enterotoxininfection modelsingle-domain antibody

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Area of Science:

  • Microbiology
  • Immunology
  • Gastroenterology

Background:

  • Bacterial enteric pathogens cause significant global diarrheal disease burden, leading to malnutrition, stunting, and mortality.
  • While diarrhea mortality has decreased, incidence remains high, necessitating novel prevention strategies.
  • Single-domain antibodies (VHHs) show promise as targeted therapeutics in the gastrointestinal tract.

Purpose of the Study:

  • To develop and evaluate a VHH-based strategy for mitigating bacterial enteric pathogen virulence.
  • To assess the efficacy of a bivalent VHH in neutralizing heat-labile enterotoxin and preventing enterotoxigenic E. coli colonization.
  • To investigate the VHH's potential against cholera toxin.

Main Methods:

  • A bivalent VHH antibody was engineered for precision binding to the heat-labile enterotoxin's B-pentamer.
  • The VHH's effect on toxin aggregation and enterotoxigenic E. coli colonization was tested in a human intestine-simulating flow chamber model.
  • In vitro assays were used to evaluate the VHH's binding to cholera toxin and its ability to abrogate cytotoxicity.

Main Results:

  • The bivalent VHH successfully aggregated the heat-labile enterotoxin's AB5 toxin.
  • VHH treatment impaired enterotoxigenic E. coli colonization in the flow chamber model.
  • The VHH demonstrated binding to cholera toxin and reduced its cytotoxicity against intestinal cells in vitro.

Conclusions:

  • Targeting bacterial virulence factors, such as enterotoxins, represents a novel therapeutic strategy.
  • VHH antibodies can effectively neutralize key toxins from enteric pathogens like E. coli and Vibrio cholerae.
  • This VHH-based approach holds potential for supporting gut health in at-risk populations, complementing existing interventions like vaccination.