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Production and Visualization of Bacterial Spheroplasts and Protoplasts to Characterize Antimicrobial Peptide Localization
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Published on: August 11, 2018

A role for antimicrobial peptides in intestinal microsporidiosis

G J Leitch1, C Ceballos

  • 1The Whitney Laboratory for Marine Bioscience, University of Florida, St Augustine, Florida 32080, USA. leitch@whitney.ufl.edu

Parasitology
|December 17, 2008
PubMed
Abstract

Insights

Intestinal antimicrobial peptides like HNP1, lactoferrin, and lysozyme inhibit microsporidia spore germination and enterocyte infection. These findings suggest a role for these peptides in defending the gut against microsporidia parasites.

Area of Science:

  • Microbiology
  • Immunology
  • Parasitology

Background:

  • Microsporidia are opportunistic pathogens causing intestinal infections.
  • The role of innate immune components, specifically antimicrobial peptides, in controlling microsporidia infections is not fully understood.

Purpose of the Study:

  • To investigate the in vitro effects of key intestinal antimicrobial peptides on spore germination and enterocyte infection by three microsporidia species.
  • To determine the potential contribution of lactoferrin, lysozyme, and defensins to intestinal defense against microsporidia.

Main Methods:

  • Spore germination assays were performed using Encephalitozoon intestinalis, Encephalitozoon hellem, and Anncaliia algerae.
  • Enterocyte-like (C2Bbe1) cell infection assays were conducted.
  • Antimicrobial peptides tested included lactoferrin (Lf), lysozyme (Lz), human beta defensin 2 (HBD2), human alpha defensin 5 (HD5), and human alpha defensin 1 (HNP1), alone and in combination.

Main Results:

  • HNP1 inhibited E. hellem spore germination, while Lf, HBD2, HD5, and HNP1 inhibited A. algerae germination.
  • HBD2 and HD5 required lysozyme for significant inhibition of A. algerae germination.
  • HNP1 significantly reduced enterocyte infection by all three species, and a combination of Lf, Lz, and HNP1 further reduced A. algerae infection.

Conclusions:

  • Intestinal antimicrobial peptides play a role in defending the gut against luminal microsporidia.
  • The efficacy of these peptides varies among microsporidia species, potentially influencing host-parasite interactions.

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