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Thyroid hormone enhances nitric oxide mediated bacterial clearance and promotes survival after meningococcal infection
Stockholm University, Faculty of Science, Department of Genetics, Microbiology and Toxicology.
Stockholm University, Faculty of Science, Department of Genetics, Microbiology and Toxicology.
Stockholm University, Faculty of Science, Department of Genetics, Microbiology and Toxicology.
Stockholm University, Faculty of Science, Department of Genetics, Microbiology and Toxicology.
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2012 (English)In: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 7, no 7, e41445Article in journal (Refereed) Published
Abstract [en]

Euthyroid sick syndrome characterized by reduced levels of thyroid hormones (THs) is observed in patients with meningococcal shock. It has been found that the level of THs reflects disease severity and is predictive for mortality. The present study was conducted to investigate the impact of THs on host defense during meningococcal infection. We found that supplementation of thyroxine to mice infected with Neisseria meningitidis enhanced bacterial clearance, attenuated the inflammatory responses and promoted survival. In vitro studies with macrophages revealed that THs enhanced bacteria-cell interaction and intracellular killing of meningococci by stimulating inducible nitric oxide synthase (iNos)-mediated NO production. TH treatment did not activate expression of TH receptors in macrophages. Instead, the observed TH-directed actions were mediated through nongenomic pathways involving the protein kinases PI3K and ERK1/2 and initiated at the membrane receptor integrin alpha v beta 3. Inhibition of nongenomic TH signaling prevented iNos induction, NO production and subsequent intracellular bacterial killing by macrophages. These data demonstrate a beneficial role of THs in macrophage-mediated N. meningitidis clearance. TH replacement might be a novel option to control meningococcal septicemia.

Place, publisher, year, edition, pages
2012. Vol. 7, no 7, e41445
National Category
Pharmacology and Toxicology Chemical Sciences
Research subject
Molecular Genetics
Identifiers
URN: urn:nbn:se:su:diva-81720DOI: 10.1371/journal.pone.0041445ISI: 000306687700091OAI: oai:DiVA.org:su-81720DiVA: diva2:563758
Note

AuthorCount:10;

Available from: 2012-10-31 Created: 2012-10-30 Last updated: 2017-12-07Bibliographically approved

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Sjölinder, MikaelWang, XiaoGao, YuminJonsson, Ann-BethSjölinder, Hong
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