Matthew Myles, Heba Barnawi, Mahmoud Mahmoudpour, Sargon Shlimon, Adrienne Chang, Daniel Zimmermann, Chiwon Choi, Najwa Zebian, Carole Creuzenet
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In contrast, the heptose increased uptake by chicken macrophages and supported adherence to human macrophages and survival within them. While the capsule triggered nitric oxide production in chicken macrophages, the heptose mitigated this and protected against nitrosative assault. Finally, the <i>C. jejuni</i> strain NCTC 11168 elicited strong cytokine production in both macrophages but quenched ROS production independently from capsule and heptose, and while the capsule and heptose did not protect against oxidative assault, they favored growth in biofilms under oxidative stress. This study shows that the wild-type capsule with its heptose is optimized to resist innate defenses in strain NCTC 11168 often via antagonistic effects of the capsule and its heptose.</p>","PeriodicalId":18573,"journal":{"name":"MicrobiologyOpen","volume":null,"pages":null},"PeriodicalIF":3.9000,"publicationDate":"2024-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mbo3.1400","citationCount":"0","resultStr":"{\"title\":\"Effect of the polysaccharide capsule and its heptose on the resistance of Campylobacter jejuni to innate immune defenses\",\"authors\":\"Matthew Myles, Heba Barnawi, Mahmoud Mahmoudpour, Sargon Shlimon, Adrienne Chang, Daniel Zimmermann, Chiwon Choi, Najwa Zebian, Carole Creuzenet\",\"doi\":\"10.1002/mbo3.1400\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><i>Campylobacter jejuni</i> is a commensal in many animals but causes diarrhea in humans. 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Effect of the polysaccharide capsule and its heptose on the resistance of Campylobacter jejuni to innate immune defenses
Campylobacter jejuni is a commensal in many animals but causes diarrhea in humans. Its polysaccharide capsule contributes to host colonization and virulence in a strain- and model-specific manner. We investigated if the capsule and its heptose are important for interactions of strain NCTC 11168 with various hosts and their innate immune defenses. We determined that they support bacterial survival in Drosophila melanogaster and enhance virulence in Galleria mellonella. We showed that the capsule had limited antiphagocytic activity in human and chicken macrophages, decreased adherence to chicken macrophages, and decreased intracellular survival in both macrophages. In contrast, the heptose increased uptake by chicken macrophages and supported adherence to human macrophages and survival within them. While the capsule triggered nitric oxide production in chicken macrophages, the heptose mitigated this and protected against nitrosative assault. Finally, the C. jejuni strain NCTC 11168 elicited strong cytokine production in both macrophages but quenched ROS production independently from capsule and heptose, and while the capsule and heptose did not protect against oxidative assault, they favored growth in biofilms under oxidative stress. This study shows that the wild-type capsule with its heptose is optimized to resist innate defenses in strain NCTC 11168 often via antagonistic effects of the capsule and its heptose.
期刊介绍:
MicrobiologyOpen is a peer reviewed, fully open access, broad-scope, and interdisciplinary journal delivering rapid decisions and fast publication of microbial science, a field which is undergoing a profound and exciting evolution in this post-genomic era.
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The journal features Original Articles (including full Research articles, Method articles, and Short Communications), Commentaries, Reviews, and Editorials. Original papers must report well-conducted research with conclusions supported by the data presented in the article. We also support confirmatory research and aim to work with authors to meet reviewer expectations.
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