BACKGROUND The enzyme 11beta-hydroxysteroid dehydrogenase (11beta-HSD) prevents inappropriate activation of the nonselective mineralocorticoid receptors by glucocorticoids. Renal activity of 11beta-HSD is decreased in patients with apparent mineralocorticoid excess (SAME), licorice-induced hypertension, and essential hypertension. Although expressed in vascular cells, the role of 11beta-HSD in ...

We examined the participation of the intraluteal levels of progesterone (P4) and prostaglandin F2 alpha (PGF2 alpha) in the induction of luteolysis by LH and its relationship with the induction of the 20 alpha-hydroxysteroid dehydrogenase activity (20 alpha-HSD). Subcutaneous administration of four doses of 10 microgram ovine LH (oLH) at 0800, 0900, 1000 and 1100 h on day 19 of pregnancy induce...

The involvement of the arachidonic acid (AA) products, noradrenaline (NA) and LH in the stimulatory effect of progesterone on its own synthesis was tested using slices of CL from days 5-10 of the oestrous cycle of cow. Slices of CL (45-50 mg) were pre-incubated for 24 h, then the medium was replaced with fresh medium and 45 min later was supplemented with LH (100 ng/ml) as a positive control, o...

Abstract Intramolecular exciton dissociation is critical for high efficient mobile charge carrier generations in organic solar cells. Yet despite much attention, the effects of ? bridges on dynamics donor–?–acceptor (D-?-A) alternating conjugated polymers remain still unclear. Here, using a combination femtosecond time-resolved transient absorption (TA) spectroscopy and steady-state spectroscop...

The enzyme 3 -hydroxysteroid dehydrogenase/ isomerase (3 HSD) is required for the biosynthesis of all active steroid hormones. It exists as multiple isoforms in humans and rodents, each a product of a distinct gene. Two isoforms, 3 HSD I and II, are expressed in a tissue-specific manner in humans. 3 HSD I is the only isoform expressed in the placenta, where it is required for the biosynthesis o...

Aldosterone stimulates the sympathetic nervous system by binding to a select population of brain mineralocorticoid receptors (MR). These MR have an equal affinity for corticosterone that is present in substantially higher concentrations, but are held in reserve for aldosterone by activity of the enzyme 11beta-hydroxysteroid dehydrogenase type 2 (11beta-HSD-2), which converts corticosterone to a...

BACKGROUND Hepatic 3β-hydroxysteroid dehydrogenase (3β-HSD) plays an important role in steroid inactivation and catabolism. Serum concentrations of steroid hormones differ significantly between breeds in pigs, however the molecular mechanism regulating hepatic 3β-HSD expression in different breeds of pigs is poorly understood. In the present study, we used preweaning purebred male Large White (...

Active sex steroids including estrogens and androgens are locally produced from circulating inactive steroids by various steroid-metabolizing enzymes, and play pivotal roles in the progression of hormone-dependent breast cancers. Human 3β-hydroxysteroid dehydrogenase type 1 (3β-HSD type 1) is a critical enzyme in the formation of all classes of active steroid hormones, and is also involved in t...

Efficacy of small-volume resuscitation (4 ml/kg) with 7.5% NaCl in 6% Dextran 70 (HSD), 7.5% NaCl (HS), dextran (D), and 0.9% NaCl (NS) was evaluated in conscious swine bled 37.5 ml/kg over 60 min. Hemorrhage reduced cardiac index (CI), stroke volume (SV), and mean arterial pressure (MAP). Four-hour survival after HSD (67%) was significantly (P less than 0.05) greater than after HS (25%), D (17...

The activity of 11 beta-hydroxysteroid dehydrogenase (11 beta-HSD) in human granulosa cells has been shown to be associated with the outcome of treatment following in-vitro fertilization and embryo transfer. There are two known isoforms of 11 beta-HSD which differ significantly in their actions and co-factor requirements. The net activity of 11 beta-HSD which differ significantly in their actio...