Nonredundant protective properties of FPR2/ALX in polymicrobial murine sepsis

Gobbetti, T., Coldewey, S.M., Chen, J., McArthur, S., le Faouder, P., Cenac, N., Flower, R.J., Thiemermann, C. and Perretti, M. 2014. Nonredundant protective properties of FPR2/ALX in polymicrobial murine sepsis. Proceedings of the National Academy of Sciences. 111 (52), pp. 18685-90. https://doi.org/10.1073/pnas.1410938111

TitleNonredundant protective properties of FPR2/ALX in polymicrobial murine sepsis
AuthorsGobbetti, T., Coldewey, S.M., Chen, J., McArthur, S., le Faouder, P., Cenac, N., Flower, R.J., Thiemermann, C. and Perretti, M.
Abstract

Sepsis is characterized by overlapping phases of excessive inflammation temporally aligned with an immunosuppressed state, defining a complex clinical scenario that explains the lack of successful therapeutic options. Here we tested whether the formyl-peptide receptor 2/3 (Fpr2/3)-ortholog to human FPR2/ALX (receptor for lipoxin A4)-exerted regulatory and organ-protective functions in experimental sepsis. Coecal ligature and puncture was performed to obtain nonlethal polymicrobial sepsis, with animals receiving antibiotics and analgesics. Clinical symptoms, temperature, and heart function were monitored up to 24 h. Peritoneal lavage and plasma samples were analyzed for proinflammatory and proresolving markers of inflammation and organ dysfunction. Compared with wild-type mice, Fpr2/3(-/-) animals exhibited exacerbation of disease severity, including hypothermia and cardiac dysfunction. This scenario was paralleled by higher levels of cytokines [CXCL1 (CXC receptor ligand 1), CCL2 (CC receptor ligand 2), and TNFα] as quantified in cell-free biological fluids. Reduced monocyte recruitment in peritoneal lavages of Fpr2/3(-/-) animals was reflected by a higher granulocyte/monocyte ratio. Monitoring Fpr2/3(-/-) gene promoter activity with a GFP proxy marker revealed an over threefold increase in granulocyte and monocyte signals at 24 h post-coecal ligature and puncture, a response mediated by TNFα. Treatment with a receptor peptido-agonist conferred protection against myocardial dysfunction in wild-type, but not Fpr2/3(-/-), animals. Therefore, coordinated physio-pharmacological analyses indicate nonredundant modulatory functions for Fpr2/3 in experimental sepsis, opening new opportunities to manipulate the host response for therapeutic development.

JournalProceedings of the National Academy of Sciences
Journal citation111 (52), pp. 18685-90
ISSN1091-6490
Year2014
PublisherNational Academy of Sciences
Digital Object Identifier (DOI)https://doi.org/10.1073/pnas.1410938111
Publication dates
Published15 Dec 2014

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