Abstract
Angiotensinogen has been identified as one of the acute-phase reactants. In vitro studies were carried out using the Reuber H35 hepatoma cell line to identify the species of cytokines contributing to the increased synthesis of angiotensinogen in the liver. Angiotensinogen secretion by H35 cells was maximally increased 4-fold by the addition of 10 −7 M dexamethasone. Under this condition, angiotensinogen secretion was further stimulated by B cell stimulatory factor 2/interleukin-6 (IL-6, 50 U/ml), but not by interleukin-1 or interferon-α. In the absence of glucocorticoid, IL-6 did not affect angiotensinogen secretion by H35 cells, indicating that the presence of glucocorticoid is required for the stimulatory activity of IL-6. These suggest that IL-6 is a mediator responsible for the increased synthesis of angiotensinogen in the liver during acute inflammation.
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