Abstract
Melatonin has been shown to enhance the immune response under immune-compromised conditions. However, its immune-modulatory effects under inflammatory conditions are unclear at present. Both pro- and anti-inflammation has been reported. To study time-dependent effects of melatonin on the general immune response during endotoxemia in more detail, we used two models in male rats: per-acute endotoxemia was induced by lipopolysaccharide (LPS) bolus injection (2.5 mg/kg), sub-acute endotoxemia by LPS infusion (2.5 mg/kg × h). Melatonin was applied directly before and 2 h after LPS administration (3 mg/kg, each). The LPS-induced formation of the pro-inflammatory cytokines tumor necrosis factor alpha, interferon-gamma, interleukin (IL)-1α/β, IL-5, and IL-6 and of the anti-inflammatory cytokine IL-10 was further amplified by melatonin, although it was only significant during per-acute endotoxemia. In both models, melatonin had no effect on the LPS-induced nitric oxide release. These findings show that exogenous melatonin is capable of enhancing the general immune response under inflammatory conditions.
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We would like to thank Mrs. Katrin Rehmann for carrying out the Bio-Plex-Assay.
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Effenberger-Neidnicht, K., Brencher, L., Broecker-Preuss, M. et al. Immune Stimulation by Exogenous Melatonin During Experimental Endotoxemia. Inflammation 37, 738–744 (2014). https://doi.org/10.1007/s10753-013-9792-y
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DOI: https://doi.org/10.1007/s10753-013-9792-y