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    Does prior sepsis alter subsequent circadian and sickness behaviour response to lipopolysaccharide treatment in mice?

    Anderson, Sean T. and O'Callaghan, Emma and Commins, Sean and Coogan, Andrew (2015) Does prior sepsis alter subsequent circadian and sickness behaviour response to lipopolysaccharide treatment in mice? Journal of Neural Transmission, 122 (Supp.1). pp. 63-73. ISSN 0300-9564

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    Previous data has shown that prior history of immune challenge may affect central and behavioural responses to subsequent immune challenge, either leading to exaggerated responses via priming mechanisms or lessened responses via endotoxin tolerance. In this set of experiments we have examined how previously lipopolysaccharide (LPS)-induced sepsis shapes the response to subsequent treatment with lower dose LPS. After treatment with LPS (5 mg/kg) or saline mice were allowed to recover for 3–4 months before being challenged with a lower dose of LPS (100 μg/kg) for assessment of sickness behaviours. Performance on the open field test and the tail suspension test was assessed, and no evidence was found that prior sepsis altered sickness or depressive-like behaviour following LPS treatment. We then examined the responsiveness of the circadian system of mice to LPS. We found that in control animals, LPS induced a significant phase delay of the behavioural rhythm and that this was not the case in post-septic animals (4–6 weeks after sepsis), indicating that prior sepsis alters the responsivity of the circadian system to subsequent immune challenge. We further assessed the induction of the immediate early genes c-Fos and EGR1 in the hippocampus and the suprachiasmatic nucleus (SCN; the master circadian pacemaker) by LPS in control or post-septic animals, and found that post-septic animals show elevated expression in the hippocampus but not the SCN. These data suggest that previous sepsis has some effect on behavioural and molecular responses to subsequent immune challenge in mice.

    Item Type: Article
    Additional Information: Cite as: Anderson, S.T., O’Callaghan, E.K., Commins, S. et al. J Neural Transm (2015) 122(Suppl 1): 63.
    Keywords: LPS; Sepsis; Circadian; Depression; Neuroimmune; Anxiety;
    Academic Unit: Faculty of Science and Engineering > Psychology
    Item ID: 10710
    Identification Number:
    Depositing User: Dr. Sean Commins
    Date Deposited: 09 Apr 2019 16:18
    Journal or Publication Title: Journal of Neural Transmission
    Publisher: Springer Verlag
    Refereed: Yes
    Funders: Health Research Board (HRB), John and Pat Hume Scholarship, NUI Maynooth
    Use Licence: This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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