Although thromboxanes (TXs) have been suggested to promote inflammation in the liver, little is known about the role of TXA(2) in leukocyte-endothelial interaction during endotoxemia. We observed using in vivo fluorescence microscopy that lipopolysaccharide (LPS) caused significant accumulation of leukocytes adhering to the hepatic microvessels and non-perfused sinusoids. Levels of serum alanine transaminase (ALT) and tumor necrosis factor alpha (TNFalpha) also increased. Lipopolysaccharide raised TXB2 level in the perfusate from isolated perfused liver. A TXA(2) synthase inhibitor, OKY-046, and a TXA(2) receptor antagonist, S-1452, reduced LPS-induced hepatic microcirculatory dysfunction by inhibiting TNFalpha production. OKY-046 suppressed expression of intercellular adhesion molecule (ICAM)-1 in LPS-treated liver. In thromboxane prostanoid receptor-knockout mice, hepatic responses to LPS were minimized in comparison with those in their wild-type counterparts. These results suggest that TXA(2) is involved in LPS-induced hepatic microcirculatory dysfunction partly through the release of TNFalpha, and that endogenous TXA(2) could be responsible for the microcirculatory dysfunction during endotoxemia.
CITATION STYLE
Katagiri, H., Ito, Y., Ishii, K., Hayashi, I., Suematsu, M., Narumiya, S., … Majima, M. (2006). Roles of Thromboxane in Lipopolysaccharide-Induced Hepatic Microcirculatory Dysfunction in Mice. In Organ Microcirculation (pp. 165–173). Springer-Verlag. https://doi.org/10.1007/4-431-27174-0_24
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