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- W2945497775 abstract "In vivo studies have shown that many stimuli such as epinephrine, exercise and pregnancy lead to a rise in factor VIII levels. However, the physiologic mechanisms controlling factor VIII levels are poorly, if at all, understood. Since endothelial cells synthesize factor VIII related protein (FVIII:RP) and can be grown in tissue culture, they provide a suitable in vitro model to study synthesis and release of FVIII:RP. Endothelial cells were harvested by collagenase digestion from human umbilical cords and grown in medium 199 supplemented with 20 to 30% pooled human serum. Confluent cultures were washed and then maintained in medium 199 supplemented with 20% fetal calf serum. Release of FVIII:RP into the medium was measured by immunoradiometric assay. Labeled amino acids were added to the medium for studies of FVIII:RP synthesis. Incorporation of radioactive label into FVIII:RP was measured in binding studies using a specific immunoadsorbent. Epinephrine in concentrations from 1 ng to 10 ug per ml had no effect on rate of release of FVIII:RP from cultured endothelial cells, suggesting that the in vivo effect of epinephrine is not due to a direct action on endothelial cells. In a separate experiment,exogenous FVIII:RP was added to the culture medium at a high concentration (2 units FVIII:RP per ml) along with 3H Leucine. A control without exogenous VIII:RP incorporated as much radioactivity into VIII:RP as did the culture with added FVIII:RP. This result suggests that there is no end product inhibition of FVIII:RP synthesis which operates on the endothelial cell." @default.
- W2945497775 created "2019-05-29" @default.
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- W2945497775 date "1977-01-01" @default.
- W2945497775 modified "2023-09-23" @default.
- W2945497775 title "In Vitro Studies of Synthesis and Release of Factor VIII Related Protein by Endothelial Cells" @default.
- W2945497775 doi "https://doi.org/10.1055/s-0039-1680352" @default.
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