Time-dependent inhibitory effect of lipopolysaccharide injection on PER1 and PER2 gene expression in the mouse heart and liver

Yusuke Yamamura, Ichiro Yano, Takashi Kudo, Shigenobu Shibata

    Research output: Contribution to journalArticle

    23 Citations (Scopus)

    Abstract

    Lipopolysaccharide (LPS) is a pathogen-associated large molecule responsible for sepsis-related endotoxic shock, and the heart is one of the most common organs adversely affected. LPS is reported to increase serum TNFα levels and reduce Per1 and Per2 gene expression. Therefore, in this experiment, we determined the time-dependent effects of LPS on heart rate (HR) and circadian gene expression in the mouse heart and liver. HR of the LPS group was significantly elevated 2 and 8 h after injection compared to the control group. A significant percent increase in HR was observed at ZT6, 12, and 18. LPS increased Tnfα mRNA expression in the heart and liver at ZT6, 18, and 24. A time-dependent effect of LPS on reduction of Per1 and Per2 gene expression was also observed in the heart and liver. In order to examine the effect of LPS on cell damage, we examined apoptosis-related gene expression after LPS injection. Bax mRNA expression level of the LPS group was higher than that of the control group 8 and 26 h after injection. On the other hand, Bcl2 mRNA expression level of the LPS group was lower than that of the control group 2 and 26 h after injection. Dexamethasone strongly attenuated the LPS-induced increase of serum TNFα without significant change in Per1 and Per2 gene expression in the heart. In conclusion, the present results demonstrated that LPS exerts a time-dependent inhibitory effect on Per1 and Per2 gene expression in the heart and liver. The chronopharmacological lethal effect of LPS may be related to the time-dependent increase of serum TNFα level and simultaneously high level of Per2 gene expression in the heart and liver between ZT12-18. Taken together, chronopharmacological effect of LPS may be related to not only sickness behavior syndrome and mortality, but also circadian rhythm systems.

    Original languageEnglish
    Pages (from-to)213-232
    Number of pages20
    JournalChronobiology International
    Volume27
    Issue number2
    DOIs
    Publication statusPublished - 2010 Mar

    Fingerprint

    Lipopolysaccharides
    Gene Expression
    Injections
    Liver
    Heart Rate
    Control Groups
    Messenger RNA
    Serum
    Illness Behavior
    Septic Shock
    Circadian Rhythm
    Dexamethasone
    Sepsis
    Apoptosis

    Keywords

    • Circadian rhythm
    • Clock genes
    • Lipopolysaccharide
    • Sepsis-related endotoxic shock

    ASJC Scopus subject areas

    • Physiology
    • Physiology (medical)

    Cite this

    Time-dependent inhibitory effect of lipopolysaccharide injection on PER1 and PER2 gene expression in the mouse heart and liver. / Yamamura, Yusuke; Yano, Ichiro; Kudo, Takashi; Shibata, Shigenobu.

    In: Chronobiology International, Vol. 27, No. 2, 03.2010, p. 213-232.

    Research output: Contribution to journalArticle

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    AU - Kudo, Takashi

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