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- W2021111392 abstract "Abstract Activation of Kupffer cells is a prominent feature of necro-inflammatory liver injury. We have recently demonstrated that 5-lipoxygenase (5-LO) and its accessory protein, 5-LO-activating protein (FLAP), are essential for the survival of Kupffer cells in culture, as their inhibition drives these liver resident macrophages to programmed cell death. In the current study, we explored whether the potent FLAP inhibitor, Bay-X-1005, reduces the number of Kupffer cells in vivo and whether this pharmacological intervention protects the liver from carbon tetrachloride (CCl4)-induced damage. Rats treated with CCl4 showed an increased number of Kupffer cells, an effect that was abrogated by the administration of Bay-X-1005 (100 mg/Kg body weight, per oral, daily). Consistent with a role for Kupffer cells in necro-inflammatory liver injury, partial depletion of Kupffer cells following FLAP inhibition was associated with a remarkable hepatoprotective action. Indeed, Bay-X-1005 significantly reduced the intense hepatocyte degeneration and large bridging necrosis induced by CCl4 treatment. Moreover, Bay-X-1005 induced a reduction in the gelatinolytic activity of matrix metalloproteinase-2 (MMP-2) and a decrease in mRNA expression of tissue inhibitor of MMP-2. The FLAP inhibitor reduced leukotriene (LT)B4 and cysteinyl LT levels and down-regulated 5-LO and FLAP protein expression in the liver. It is interesting that a significant increase in the hepatic formation of lipoxin A4, an endogenous, anti-inflammatory lipid mediator involved in the resolution of inflammation, was observed after the administration of Bay-X-1005. These findings support the concept that modulation of the 5-LO pathway by FLAP inhibition may be useful in the prevention of hepatotoxin-induced necro-inflammatory injury." @default.
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- W2021111392 date "2005-07-20" @default.
- W2021111392 modified "2023-10-15" @default.
- W2021111392 title "Inhibition of 5-lipoxygenase-activating protein abrogates experimental liver injury: role of Kupffer cells" @default.
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- W2021111392 doi "https://doi.org/10.1189/jlb.1204747" @default.
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