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Τρίτη 15 Ιανουαρίου 2019

Lipopolysaccharide structures of Gram-negative populations in the Gut Microbiota and effects on host interactions

Abstract
The human gastrointestinal tract harbors a heterogeneous and complex microbial community which plays a key role in human health. The gut microbiota controls the development of the immune system by setting systemic threshold for immune activation. Glycoconjugates, such as lipopolysaccharides, from gut bacteria have been shown to be able to elicit both systemic proinflammatory and immunomodulatory responses. This phenomenon is particularly intriguing considering that the immune system is charged with the task to distinguish the beneficial microbes from the pathogens, even if the commensal bacteria have molecular patterns resembling those of the pathogenic counterparts. Therefore, the importance of the chemical structure of these macromolecules in the fine tuning this delicate equilibrium is beyond question. This review offers an overview of the current understanding of chemical peculiarities of the lipopolysaccharides isolated from the gut microbiota, and their relationships to their biological activity in terms of immune system maturation and development.

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