Abstract
This study examines the regulatory effects of two cytokines, stem cell factor (SCF) and interleukin-3, and a glucocorticoid, dexamethasone, on lipid mediator generation in mouse bone marrow-derived mast cells (BMMC). Treatment of BMMC with SCF induced a modest, dose-dependent increase in three eicosanoids, thromboxane B2, prostaglandin D2, and leukotriene B4. These increases were accompanied by a marked elevation in cytosolic PLA2 (cPLA2). Dexamethasone blocked the induction of cPLA2 levels and the elevation in leukotriene B4 induced by SCF. By contrast, the combination of SCF and dexamethasone dramatically increased (5-8-fold) the capacity by BMMC to produce prostanoid products. This increase in prostanoid products was mirrored by an increase in prostaglandin G/H synthase I (PGHS-I) levels. Dexamethasone, alone, had no effect on PGHS-I, cPLA2, or prostanoid levels. Moreover, neither SCF or dexamethasone, alone or in combination, influenced prostaglandin G/H synthase II (PGHS-II) levels. In contrast to SCF, interleukin-3 alone or in combination with dexamethasone had no effect on prostanoid synthesis or PGHS-I or II levels. To better understand the SCF and dexamethasone effect, PGHS-I and PGHS-II mRNA expression were examined b...Continue Reading
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