RESUMO
In an in vitro rat liver slice incubation system, the synthesis of fibrinogen, when measured by immunoprecipitation technique was stimulated in the presence of epinephrine. An increase in poly (A)+ RNA content of the liver slice was also observed after epinephrine treatment. This in vitro experiment demonstrated that epinephrine stimulated de novo synthesis of fibrinogen by acting directly on the liver.
RESUMO
A method has been developed to isolate cells from the submaxillary gland of mouse by treatment with pronase. Three fractions of cells have been isolated having almost equal iodide concentrating activity. The isolated cells show time dependent uphill transport of iodide. The transport is substrate-saturable, having a Km value of 0·3 μΜ for iodide. The transport is sensitive to antithyroid drugs, metabolic inhibitors and to some extent to ouabain. Pseudohalide such as thiocyanate competes with the transport of iodide. Thyroid hormones or thyroid stimulating hormone have no significant effect on the iodide transport in these cells.