Artículo
Effect of human defensins on lactobacilli and liposomes
Fecha de publicación:
11/2012
Editorial:
Wiley Blackwell Publishing, Inc
Revista:
Journal of Applied Microbiology
ISSN:
1364-5072
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Aims: To study the effect of human b-defensins (HBD-1 and HBD-2) on lactobacilli membranes as well as on liposomes prepared from purified bacterial lipids. Methods and Results: Lactobacillus delbrueckii subsp. bulgaricus CIDCA 331 and Lact. delbrueckii subsp. lactis CIDCA 133 were grown in Man, Rogosa, Sharpe broth for 16 h at 37°C. After being washed, micro-organisms were treated with 0 1–10 lg ml1 of HBD-1 and HBD-2 (30 min, 37°C). Bacterial damage was determined by flow cytometry after propidium iodide staining. In parallel experiments, release of carboxyfluorescein from liposomes prepared from bacterial lipids was determined fluorometrically (excitation 485/20 nm, emission 528/20 nm) in the presence of HBD-1, HBD-2 or Nisin. Exposure of lactobacilli to HBD-2 resulted in a significant membrane permeabilization being Lact. delbrueckii subsp. bulgaricus CIDCA 331 the most susceptible strain. Liposomes prepared with lipids from strain CIDCA 133 were destabilized neither by HBD-1 nor by HBD-2, whereas liposomes derived from strain CIDCA 331 were susceptible to HBD-2 but not to HBD-1. Effect of defensins was strongly inhibited in the presence of NaCl, and the activity increased in water. Conclusions: Results reported in the presented work indicate that lipid composition of bacterial membranes lead to a different interaction with cationic peptides such as defensins. Significance and Impact of the study: The results represent an advance in the understanding of the differential effect of HBDs on micro-organisms. Differences in susceptibility to anti-microbial peptides could modify the fate of micro-organisms after the interaction with host’s cells.
Palabras clave:
ANTIMICROBIALS
,
IMMUNOLOGY
,
LACTOBACILLUS
,
MEMBRANE
,
PROBIOTICS
Archivos asociados
Licencia
Identificadores
Colecciones
Articulos(CIDCA)
Articulos de CENTRO DE INV EN CRIOTECNOLOGIA DE ALIMENTOS (I)
Articulos de CENTRO DE INV EN CRIOTECNOLOGIA DE ALIMENTOS (I)
Citación
Hugo, Ayelen Amelia; Tymczyszyn, Emma Elizabeth; Gomez Zavaglia, Andrea; Perez, Pablo Fernando; Effect of human defensins on lactobacilli and liposomes; Wiley Blackwell Publishing, Inc; Journal of Applied Microbiology; 113; 11-2012; 1491-1497
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