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Experimental Sepsis Severity Score Associated to Mortality and Bacterial Spreading is Related to Bacterial Load and Inflammatory Profile of Different Tissues

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Abstract

Pneumonia-induced sepsis is responsible for about 50% of cases in the world. Patients who develop severe sepsis and septic shock present organ dysfunction and elevated plasma cytokine levels, which may lead to death. Clinical scores are important to evaluate the framework of septic patients and are used to predict the syndrome progress, prognostics, and mortality. The objective of the present study was to verify the applicability of a murine clinical score system to experimental sepsis (pneumonia-induced sepsis in male mice) and to correlate it with mortality and bacterial dissemination in different organs. Results demonstrated that animals which present higher clinical scores (>3) are more likely to die. Animals presenting high clinical scores exhibited transient bacteremia and displayed bacterial spreading to different organs such as heart, kidney, liver, and brain. There is a correlation between clinical score and bacterial dissemination and consequently greater risk of death. In addition, animals which showed bacterial dissemination in more than three organs and high clinical scores presented high levels of cytokines (TNF-α, MCP-1, IL-6, and IL-10) in plasma, lung, heart, liver, kidney, and brain. Therefore, our study suggests that (1) severity scores have predictive power in experimental models of sepsis and (2) high concentrations of tissue cytokines may contribute to localized inflammation and be one of the factors responsible for the systemic inflammatory syndrome of sepsis.

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Acknowledgements

This work was funded by grants from CNPq, Brazil (grant 474295/2012-5) and FAPESC, Brazil (grant 2014TR1698). The skillful technical assistance of Mrs. Adriane Madeira is gratefully acknowledged. We also thank the technicians of Multiuser Laboratory of Biology Studies (LAMEB-UFSC).

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  1. Department of Pharmacology, Center of Biological Sciences, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil

    Muryel Carvalho Gonçalves, Verônica Vargas Horewicz, Débora Denardin Lückemeyer, Arthur Silveira Prudente & Jamil Assreuy

  2. Department of Pharmacology, Block D/CCB, Universidade Federal de Santa Catarina, Florianópolis, SC, 88040-900, Brazil

    Jamil Assreuy

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  1. Muryel Carvalho Gonçalves
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Gonçalves, M.C., Horewicz, V.V., Lückemeyer, D.D. et al. Experimental Sepsis Severity Score Associated to Mortality and Bacterial Spreading is Related to Bacterial Load and Inflammatory Profile of Different Tissues. Inflammation 40, 1553–1565 (2017). https://doi.org/10.1007/s10753-017-0596-3

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