High-polyphenol Extracts from Sorghum Bicolor Attenuate Replication of Legionella Pneumophila Within RAW 264.7 Macrophages

Overview

Journal FEMS Microbiol Lett

Publisher Oxford University Press

Specialty Microbiology

Date 2020 Mar 20

PMID 32188994

Citations 6

Authors

Aubrey K Gilchrist

Dmitriy Smolensky

Tshegofatso Ngwaga

Deepika Chauhan

Sarah Cox

Ramasamy Perumal

Leela E Noronha

Stephanie R Shames

Affiliations

Soon will be listed here.

Abstract

Polyphenols derived from a variety of plants have demonstrated antimicrobial activity against diverse microbial pathogens. Legionella pneumophila is an intracellular bacterial pathogen that opportunistically causes a severe inflammatory pneumonia in humans, called Legionnaires' Disease, via replication within macrophages. Previous studies demonstrated that tea polyphenols attenuate L. pneumophila intracellular replication within mouse macrophages via increased tumor necrosis factor (TNF) production. Sorghum bicolor is a sustainable cereal crop that thrives in arid environments and is well-suited to continued production in warming climates. Sorghum polyphenols have anticancer and antioxidant properties, but their antimicrobial activity has not been evaluated. Here, we investigated the impact of sorghum polyphenols on L. pneumophila intracellular replication within RAW 264.7 mouse macrophages. Sorghum high-polyphenol extract (HPE) attenuated L. pneumophila intracellular replication in a dose-dependent manner but did not impair either bacterial replication in rich media or macrophage viability. Moreover, HPE treatment enhanced both TNF and IL-6 secretion from L. pneumophila infected macrophages. Thus, polyphenols derived from sorghum enhance macrophage restriction of L. pneumophila, likely via increased pro-inflammatory cytokine production. This work reveals commonalities between plant polyphenol-mediated antimicrobial activity and provides a foundation for future evaluation of sorghum as an antimicrobial agent.

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