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Modulation of Macrophage Function by Lactobacillus-Conditioned Medium

Nanjundaiah, YS, Wright, DA, Baydoun, AR, Khaled, Z, Ali, Z, Dean, P and Sarker, MH (2020) Modulation of Macrophage Function by Lactobacillus-Conditioned Medium. Frontiers in Cell and Developmental Biology, 8. p. 723.

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Probiotics are used as microbial food supplements for health and well-being. They are thought to have immunomodulatory effects although their exact physiological mechanism of action is not clear. This study investigated the influence of probiotic Lactobacillus rhamnosus GG conditioned media (LGG-CM) on macrophage phagocytosis of non-pathogenic Escherichia coli HfrC. The gentamicin protection assay was used to study the bacterial killing phases of phagocytosis. Macrophages co-incubated with E. coli for an hour allowed them to ingest bacteria and then the rate of E. coli killing was monitored for up to 300 min to determine the killing or digestion of the bacteria by recovering them from the macrophage lysate. We found that the LGG-CM significantly increased the bacterial killing by approximately 6-fold when compared with that of controls. By contrast, this killing process was found to be associated with enhanced free radical production via the activation of NADPH oxidase, stimulated by the LGG conditioned medium. We also found that the conditioned medium had small effect on nitric oxide (NO) generation, albeit to a lesser extent. This work suggests that LGG-CM may play an important role in suppressing the total microbial load within the macrophages and hence, the extent to which pro-inflammatory molecules such as free radicals and NO are generated. The modulation of inflammation-promoting signals by LGG-CM may be beneficial as it modulates bacterial killing, and thereby prevents any collateral damage to host.

Item Type: Article
Uncontrolled Keywords: Lactobacillus rhamnosus GG; free radicals; macrophage; nitric oxide; phagocytosis
Subjects: Q Science > QH Natural history > QH301 Biology
R Medicine > RS Pharmacy and materia medica
Divisions: Pharmacy & Biomolecular Sciences
Publisher: Frontiers Media
SWORD Depositor: A Symplectic
Date Deposited: 14 Feb 2024 15:14
Last Modified: 14 Feb 2024 15:15
DOI or ID number: 10.3389/fcell.2020.00723
URI: https://researchonline.ljmu.ac.uk/id/eprint/22622
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