Limited Colonization Undermined by Inadequate Early Immune Responses Defines the Dynamics of Decidual Listeriosis

Infection and Immunity
Gabrielle A RizzutoAnna I Bakardjiev

Abstract

The bacterial pathogen Listeria monocytogenes causes foodborne systemic disease in pregnant women, which can lead to preterm labor, stillbirth, or severe neonatal disease. Colonization of the maternal decidua appears to be an initial step in the maternal component of the disease as well as bacterial transmission to the placenta and fetus. Host-pathogen interactions in the decidua during this early stage of infection remain poorly understood. Here, we assessed the dynamics of L. monocytogenes infection in primary human decidual organ cultures and in the murine decidua in vivo A high inoculum was necessary to infect both human and mouse deciduas, and the data support the existence of a barrier to initial colonization of the murine decidua. If successful, however, colonization in both species was followed by significant bacterial expansion associated with an inability of the decidua to mount appropriate innate cellular immune responses. The innate immune deficits included the failure of bacterial foci to attract macrophages and NK cells, cell types known to be important for early defenses against L. monocytogenes in the spleen, as well as a decrease in the tissue density of inflammatory Ly6Chi monocytes in vivo These results sugge...Continue Reading

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Citations

Feb 9, 2018·Gut Microbes·Natacha ColliouMansour Mohamadzadeh
Aug 26, 2020·The Journal of Immunology : Official Journal of the American Association of Immunologists·Petoria GayleKurt Schesser
Aug 27, 2021·Nature Reviews. Microbiology·Christina J Megli, Carolyn B Coyne
Nov 17, 2021·American Journal of Perinatology·Christina J MegliSteve N Caritis

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