Publication
Title
Exopolysaccharides of **Lactobacillus rhamnosus** GG form a protective shield against innate immune factors in the intestine
Author
Abstract
Probiotic bacteria are administered as live microorganisms to provide a health benefit to the host. Insight into the adaptation factors that promote the survival and persistence of probiotics in the gastrointestinal tract (GIT) is important to understand their performance. In this study, the role of the long galactose-rich exopolysaccharides (EPS) of the prototypical probiotic strain Lactobacillus rhamnosus GG (LGG) was investigated. In a competition experiment with wild type, the isogenic EPS mutant CMPG5351 exhibited a reduced persistence in the murine GIT, especially in the lower parts of the intestine. This was surprising as our previous in vitro studies had shown an increased adhesion capacity for this EPS mutant. Follow-up assays indicated that this mutant is more sensitive towards host innate defence molecules, such as the LL-37 antimicrobial peptide and complement factors. This suggests that EPS forms a protective shield for LGG against these molecules in the GIT. Moreover, culturing LGG wild-type in subinhibitory concentrations of host defence factors such as LL-37 resulted in increased production of EPS, indicating that bacterial EPS production is modulated in the host to fine-tune the balance between adhesion and immune evasion. These observations are of interest in understanding the dynamics of adaptation of probiotics to the host environments.
Language
English
Source (journal)
Microbial biotechnology
Publication
2011
ISSN
1751-7915
Volume/pages
4:3(2011), p. 368-374
ISI
000289894700008
Full text (Publisher's DOI)
Full text (open access)
UAntwerpen
Faculty/Department
Research group
Publication type
Subject
External links
Web of Science
Record
Identification
Creation 02.01.2012
Last edited 13.12.2017