Microbial (co)infections: Powerful immune influencers

Author:

Hassan Ali,Blanchard NicolasORCID

Abstract

It is well established that by modulating various immune functions, host infection may alter the course of concomitant inflammatory diseases, of both infectious and autoimmune etiologies. Beyond the major impact of commensal microbiota on the immune status, host exposure to viral, bacterial, and/or parasitic microorganisms also dramatically influences inflammatory diseases in the host, in a beneficial or harmful manner. Moreover, by modifying pathogen control and host tolerance to tissue damage, a coinfection can profoundly affect the development of a concomitant infectious disease. Here, we review the diverse mechanisms that underlie the impact of (co)infections on inflammatory disorders. We discuss epidemiological studies in the context of the hygiene hypothesis and shed light on the sometimes dual impact of germ exposure on human susceptibility to inflammatory disease. We then summarize the immunomodulatory mechanisms at play, which can involve pleiotropic effects of immune players and discuss the possibility to harness pathogen-derived compounds to the host benefit.

Funder

Inserm

Association pour la Recherche sur la Sclérose en Plaques

PIA PARAFRAP Consortium

Agence Nationale pour la Recherche

Ministère de l'Enseignement Supérieur et de la Recherche

Publisher

Public Library of Science (PLoS)

Subject

Virology,Genetics,Molecular Biology,Immunology,Microbiology,Parasitology

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