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- W2956373995 abstract "Leukotrienes mediate several inflammatory events such as neutrophil chemoattraction, leukocyte adhesion, and central-release of cytokines and fever. However, there is no information available about their putative role in lipopolysaccharide (LPS) tolerance. The rational of the present study was to find out if central leukotrienes are involved in the development of LPS tolerance. Thus, we inhibited central leukotriene synthesis in tolerant rats using a pharmacological tool, i.e., a selective inhibitor of leukotriene synthesis MK-886 injected into the third ventricle (3V) of rats. Body core temperature (Tb) was measured using a datalogger placed inside the abdominal cavity. A low-dose of LPS (100 μg/kg ip) was given for 4 consecutive days to induce LPS tolerance. At day 4, rats received a microinjection of MK-886 into the 3V immediately before LPS, whereas control groups were treated with vehicle (saline). We observed that LPS failed to induce plasma cytokines surges, increased hypothalamic PGE2 levels and fever 3 days post LPS treatment, aptly characterizing the tolerance. When MK-886 was given to control rats treated with saline, no significant change in Tb was observed. However, a full LPS-induced fever was observed in tolerant rats pretreated with MK-886, which was associated with an enhancement in the hypothalamic PGE2 levels, that were not accompanied by plasma cytokines (IL-1β, and IL-6) and PGE2 surges. These data are consistent with the notion that central leukotrienes play a role in fever tolerance to LPS." @default.
- W2956373995 created "2019-07-23" @default.
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- W2956373995 date "2019-08-01" @default.
- W2956373995 modified "2023-10-16" @default.
- W2956373995 title "Central leukotrienes modulate fever tolerance to LPS in rats" @default.
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- W2956373995 doi "https://doi.org/10.1016/j.jtherbio.2019.07.015" @default.
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