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    Lipopolysaccharide-induced sepsis induces long-lasting affective changes in the mouse


    Anderson, Sean T. and Commins, Sean and Moynagh, Paul N. and Coogan, Andrew (2015) Lipopolysaccharide-induced sepsis induces long-lasting affective changes in the mouse. Brain, Behavior, and Immunity, 43. pp. 98-109. ISSN 0889-1591

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    Abstract

    Post-septic encephalopathy is a poorly understood condition in survivors of sepsis that is characterised by cognitive and affective impairments. In this study we have sought to better understand this condition by undertaking a comprehensive behavioural and cognitive assessment of mice who had previously survived sepsis. Mice were treated with lipopolysaccharide (LPS; 5 mg/kg) and one month after this assessed on a battery of tests. Post-septic animals were found to display significantly more immobility in the tail suspension test and show a significantly decreased sucrose preference. Acute fluoxetine treatment reversed the increase in immobility in the tail suspension test in post-septic animals. Post-septic animals also showed less overall exploratory behaviour in the novel object recognition task and also showed increased anxiety-like behaviour in the elevated plus maze. Post-septic mice did not show signs of cognitive impairment, as assessed in the Morris watermaze, the 8-arm radial maze or on preference for the novel object in the novel object recognition task. Immunohistochemical analysis revealed significant upregulation of the microglial marker CD-11b, F4/80 and IBA-1 in the hippocampus of post-septic animals, as well as significant downregulation of the plasticity-related immediate early gene products ARC and EGR1. We also observed a decrease in neural stem cell proliferation in the dentate gyrus of post-septic animals as judged by BrdU incorporation. Co-treatment with the NF-κB pathway inhibitor PDTC attenuated the long-lasting effects of LPS on most of the affected parameters, but not on neural stem cell proliferation. These results show that LPS-induced sepsis in the mouse is followed by long-lasting increases in depressive- and anxiety-like behaviours, as well as by changes in neuroinflammatory- and neural plasticity-associated factors, and that attenuation of the severity of sepsis by PDTC attenuates many of these effects.

    Item Type: Article
    Keywords: Sepsis; LPS; Behaviour; Cognition; Depression; Neuroinflammation; Hippocampus;
    Academic Unit: Faculty of Science and Engineering > Psychology
    Item ID: 10711
    Identification Number: https://doi.org/10.1016/j.bbi.2014.07.007
    Depositing User: Dr. Sean Commins
    Date Deposited: 09 Apr 2019 16:38
    Journal or Publication Title: Brain, Behavior, and Immunity
    Publisher: Elsevier
    Refereed: Yes
    URI:

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