Data/hora: 11/06/2024 01:20:39

Provedor de dados: 	Institutional Archive of Ifreme (ArchiMer)	
País: 	France	
Título: 	Deconjugated Bile Salts Produced by Extracellular Bile-Salt Hydrolase-Like Activities from the Probiotic Lactobacillus johnsonii La1 Inhibit Giardia duodenalis In vitro Growth	
Autores: 	Travers, Marie-agnes; Sow, Cisse; Zirah, Severine; Deregnaucourt, Christiane; Chaouch, Soraya; Queiroz, Rayner M. L.; Charneau, Sebastien; Allain, Thibault; Florent, Isabelle; Grellier, Philippe.	
Data: 	2016-09	
Ano: 	2016	
Palavras-chave: 	Giardiasis; Lactobacilli; Probiotics; Microbiota; Bile salts; Anti-giardial activity; Choloylglycine bile acid hydrolase.	
Resumo: 	Giardiasis, currently considered a neglected disease, is caused by the intestinal protozoan parasite Giardia duodenalis and is widely spread in human as well as domestic and wild animals. The lack of appropriate medications and the spread of resistant parasite strains urgently call for the development of novel therapeutic strategies. Host microbiota or certain probiotic strains have the capacity to provide some protection against giardiasis. By combining biological and biochemical approaches, we have been able to decipher a molecular mechanism used by the probiotic strain Lactobacillus johnsonii La1 to prevent Giardia growth in vitro. We provide evidence that the supernatant of this strain contains active principle(s) not directly toxic to Giardia but able to convert non-toxic components of bile into components highly toxic to Giardia. By using bile acid profiling, these components were identified as deconjugated bile-salts. A bacterial bile-salt-hydrolase of commercial origin was able to mimic the properties of the supernatant. Mass spectrometric analysis of the bacterial supernatant identified two of the three bile-salt-hydrolases encoded in the genome of this probiotic strain. These observations document a possible mechanism by which L. johnsonii La1, by secreting, or releasing BSH-like activity(ies) in the vicinity of replicating Giardia in an environment where bile is present and abundant, can fight this parasite. This discovery has both fundamental and applied outcomes to fight giardiasis, based on local delivery of deconjugated bile salts, enzyme deconjugation of bile components, or natural or recombinant probiotic strains that secrete or release such deconjugating activities in a compartment where both bile salts and Giardia are present.	
Tipo: 	Text	
Idioma: 	Inglês	
Identificador: 	http://archimer.ifremer.fr/doc/00351/46211/45906.pdf

DOI:10.3389/fmicb.2016.01453

http://archimer.ifremer.fr/doc/00351/46211/	
Editor: 	Frontiers Media Sa	
Formato: 	application/pdf	
Fonte: 	Frontiers In Microbiology (1664-302X) (Frontiers Media Sa), 2016-09 , Vol. 7 , P. -	
Fonte: 	2016 Travers, Sow, Zirah, Deregnaucourt, Chaouch, Queiroz, Charneau, Allain, Florent and Grellier. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which d

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