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- W2097893463 abstract "Hepatic metastasis in melanoma is affected by processes of tumor cell adhesion to sinusoidal cells, avoidance of cytotoxic cells, and local growth-promoting activity. A role for interleukin-1 (IL-1) in these events was evaluated in vitro and in vivo by specifically blocking IL-1 receptors using the naturally occurring IL-1 receptor antagonist (IL-1Ra). At 10- and 100-fold molar excess, IL-1Ra reduced the IL-1-mediated adhesion of B16 melanoma cells to cultured hepatic sinusoidal endothelial cells by 60 and 100%, respectively. Conditioned media derived from murine hepatic sinusoidal endothelial cells contain growth-promoting activity for B16 cells, and IL-1 increased its production 2.5-fold (P < 0.01). The addition of IL-1Ra to sinusoidal cells reduced the spontaneous release of the growth-promoting activity by 32% (P < 0.05). In addition, blocking IL-1 receptors on melanoma cells reduced their responsiveness to endothelial-conditioned medium (P < 0.05). A single dose of IL-1Ra (0.5 mg/kg) given to mice i.p. 2 h prior to intrasplenic injection of melanoma cells reduced the number of hepatic metastases by 50% and the metastatic volume by 70% compared to vehicle-injected controls (P < 0.01). When given 2, 4, and 6 days after the injection of tumor cells, IL-1Ra reduced the volume of metastases by 58% (P < 0.01). Fifty % of mice pretreated with 0.5 mg/kg IL-1Ra and given 3 additional doses on days 2, 4, and 6 died after 13.5 +/- 0.4 days compared to 11.3 +/- 0.2 days for controls (P < 0.01). In mice pretreated and given 10 daily doses at 5 mg/kg, there was an 80% reduction in hepatic metastases. Using this regimen, survival was 18.1 +/- 2.4 days in the IL-1Ra group and 11.2 +/- 1.5 in controls (P < 0.001). These studies demonstrate a significant role for IL-1 in implantation and growth of metastatic melanoma in the liver." @default.
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- W2097893463 date "1994-05-15" @default.
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- W2097893463 title "Interleukin-1 receptor blockade reduces the number and size of murine B16 melanoma hepatic metastases." @default.
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