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Ex Vivo Intestinal Sacs to Assess Mucosal Permeability in Models of Gastrointestinal Disease
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Ex Vivo Intestinal Sacs to Assess Mucosal Permeability in Models of Gastrointestinal Disease

Published on: February 9, 2016

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Intestinal mucus affinity and biological activity of an orally administered antibacterial and anti-inflammatory

Aline Dupont1, Yani Kaconis2, Ines Yang1

  • 1Institute of Medical Microbiology and Hospital Epidemiology, Hannover Medical School, Hannover, Germany.

Gut
|May 10, 2014
PubMed
Abstract

Insights

The synthetic antimicrobial peptide Pep19-2.5 shows mucus affinity and anti-inflammatory effects. Oral administration alters gut microbiota composition and impacts bacterial infection outcomes.

Area of Science:

  • Microbiology
  • Immunology
  • Gastroenterology

Background:

  • Antimicrobial peptides (AMPs) are crucial for host defense against pathogens and maintaining mucosal homeostasis.
  • AMPs exhibit significant anti-inflammatory properties.
  • Understanding the role of orally administered AMPs in gut health is essential.

Purpose of the Study:

  • To analyze the anatomical distribution and biological activity of an orally administered AMP.
  • To investigate the peptide's effects on bacterial infection and host-microbial homeostasis.
  • To evaluate the synthetic peptide Pep19-2.5 in comparison to endogenous cryptdin 2.

Main Methods:

  • Analysis of endogenous cryptdin 2 and synthetic Pep19-2.5 distribution using immunostaining.
  • Assessment of antibacterial and anti-inflammatory activity via functional assays.
  • Utilizing an oral Salmonella Typhimurium infection model with comparative microbiota analysis.

Main Results:

  • Pep19-2.5 demonstrated rapid bacterial cell attachment and strong affinity for the intestinal mucus layer.
  • The peptide altered endotoxin structure within the mucus matrix, showing potent antibacterial and anti-inflammatory activity.
  • Oral Pep19-2.5 administration significantly changed enteric microbiota composition, leading to transient symptom improvement in S. Typhimurium infection.

Conclusions:

  • The synthetic AMP Pep19-2.5 possesses significant anti-inflammatory activity and mucus-binding properties.
  • Oral administration of Pep19-2.5 influences gut microbiota composition.
  • The study characterizes the impact of Pep19-2.5 on enteropathogen infection and host-microbial balance.
Keywords:
ANTI-BACTERIAL MUCOSAL IMMUNITYBACTERIAL INFECTIONMUCOSAL BARRIERMUCOSAL INFECTION

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