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11beta-Hydroxysteroid dehydrogenases (11beta-HSD) interconvert cortisol, the physiological glucocorticoid, and its inactive metabolite cortisone in humans. There are two isoforms. The type 1 isoform (11beta-HSD1) catalyzes both 11beta-dehydrogenation (cortisol to cortisone) and the reverse oxoreduction (cortisone to cortisol), but the type 2 isoform (11beta-HSD2) catalyzes only 11beta-dehydrogenation. The diminished dehydrogenase activity has been demonstrated in resistance vessels of genetically hypertensive rats. However, the isoform(s) that plays a significant role in conferring the dehydrogenase activity on vasculature has not been determined. We investigated 11beta-HSD activities in human vascular smooth muscle cells by manipulating 11beta-HSD expressions with antisense oligonucleotides. The results showed that 11beta-HSD2 dominates functioning in the dehydrogenase mode in these cells. This indicates that impairment of 11beta-HSD2 activity in vascular wall may be related to the pathogenesis of hypertension.

11.BETA.-Hydroxysteroid Dehydrogenase Activity in Human Aortic Smooth Muscle Cells.