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• W2134776579 abstract "To date, much of the adhesion work in the liver has been restricted to sinusoids and postsinusoidal venules. However, selectins have been localized on the portal (presinusoidal) venules and these vessels have been shown to be important in metastasis of tumors. The purpose of this study was to characterize the leukocyte-endothelial interactions within the 3 compartments of the hepatic microvasculature under baseline conditions and in response to tumor necrosis factor alpha (TNF-alpha). Mice deficient in P-selectin or both E- and P-selectin were compared with wild-type (C57Bl/6, wild type) mice. Animals were injected with murine TNF-alpha (15 microg/kg intraperitoneally [IP]) and the liver was examined by fluorescence intravital microscopy 4 hours later. Under baseline conditions, leukocyte flux in the portal venules was 1.42 +/- 0.42 cells/min. Leukocyte flux in the portal venules of wild-type mice increased 8-fold in response to 4 hours of TNF-alpha stimulation. This was reduced by 50% in the P-selectin-deficient mice but was not reduced further by either the addition of an E-selectin antibody (9A9, 100 microg intravenously [IV]) to these mice or in mice deficient in both E- and P-selectin. In P-selectin-deficient mice, the addition of an antibody against alpha(4)-integrin (R1-2, 75 microg IP) reduced rolling to baseline. But in the E- and P-double-selectin-deficient mice the addition of an antibody against L-selectin (Mel 14, 3 microg/kg IV) had no effect on TNF-alpha-induced recruitment. Similar responses were seen in the central venules, however, in the sinusoids the increased number of stationary leukocytes seen in response to 4 hours of TNF-alpha stimulation in the wild-type mice was not reduced in P-selectin-deficient mice with or without the alpha(4)-integrin antibody. These data suggest that leukocytes can use alpha(4)-integrin independent of the selectins in the venules. Within the sinusoids, however, inhibition of E-selectin, P-selectin, and alpha(4)-integrin was insufficient to reduce leukocyte recruitment." @default.
• W2134776579 created "2016-06-24" @default.
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• W2134776579 date "2000-05-01" @default.
• W2134776579 modified "2023-10-17" @default.
• W2134776579 title "Molecular mechanisms of tumor necrosis factorα–stimulated leukocyte recruitment into the murine hepatic circulation" @default.
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• W2134776579 doi "https://doi.org/10.1053/he.2000.6961" @default.
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