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Pathogens 2018, 7(4), 96;

Stimulating Respiratory Activity Primes Anaerobically Grown Listeria monocytogenes for Subsequent Intracellular Infections

Department of Biology, University of Dayton, Dayton, OH 45469, USA
Author to whom correspondence should be addressed.
Received: 8 November 2018 / Revised: 30 November 2018 / Accepted: 5 December 2018 / Published: 8 December 2018
(This article belongs to the Section Human Pathogens)
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Listeria monocytogenes (L. monocytogenes) is a Gram-positive, enteric pathogen and the causative agent of listeriosis. During transition through the gastrointestinal tract, L. monocytogenes routinely encounters suboxic conditions. However, how the exposure to the low oxygen environment affects subsequent pathogenesis is not completely understood. Our lab previously reported that anaerobically grown L. monocytogenes exhibited an intracellular growth defect in macrophages even though the infection took place under aerobic conditions. This phenotype suggests that prior growth conditions have a prolonged effect on the outcome of subsequent intracellular infection. In this study, to further investigate the mechanisms that contribute to the compromised intracellular growth after anaerobic exposure, we hypothesized that the lack of respiratory activity under anaerobic conditions prevented anaerobically grown L. monocytogenes to establish subsequent intracellular growth under aerobic conditions. To test this hypothesis, respiratory activity in anaerobically grown L. monocytogenes was stimulated by exogenous fumarate and subsequent intracellular pathogenesis was assessed. The results showed that fumarate supplementation significantly increased the respiratory activity of anaerobically grown L. monocytogenes and rescued the subsequent intracellular growth defect, likely through promoting the production of listeriolysin O, phagosomal escape, and cell-cell spread. This study highlights the importance of respiratory activity in L. monocytogenes in modulating the outcome of subsequent intracellular infections. View Full-Text
Keywords: Listeria monocytogenes; anaerobic respiration; fumarate; intracellular infection Listeria monocytogenes; anaerobic respiration; fumarate; intracellular infection

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Wallace, N.; Rinehart, E.; Sun, Y. Stimulating Respiratory Activity Primes Anaerobically Grown Listeria monocytogenes for Subsequent Intracellular Infections. Pathogens 2018, 7, 96.

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