Endocrine Abstracts

11beta-hydroxysteroid dehydrogenase type 1 (11beta-HSD1) has been implicated in the pathogenesis of human obesity and insulin resistance through 11-oxoreductase activation of cortisol (F) from cortisone (E) stimulating adipocyte differentiation and hepatic glucose output. In its purified state however, 11beta-HSD1 is a dehydrogenase inactivating F to E. In patients with cortisone reductase deficiency we recently identified two inactivating mutations, delta29bp and R453Q, withi...

Aim of this study was the evaluation of the accuracy of ultrasound and US-FNAB in the diagnosis of thyroid cancer in a population of subjects submitted to US-FNAB of all thyroid nodules, with no prior selection. 1803 patients (1447 females e 356 males, age range 11 – 87 years, mean 49.6±13.7, with a total of 3378 nodules) were submitted by the same physician (first author) to ultrasound evaluation and US-FNAB of all thyroid nodules. Results. The nodules were 3 to 90 ...

11beta-hydroxysteroid dehydrogenase type 1 (11beta-HSD1) has been implicated in the pathogenesis of human obesity and insulin resistance through 11-oxoreductase activation of cortisone (E) to cortisol (F) within the endoplasmic reticulum (ER) of adipocytes and hepatocytes. In its purified state 11beta-HSD1 is principally a dehydrogenase, converting F to E. Oxo-reductase activity can be regained by the addition of an NADPH regeneration system. In vivo hexose-6-phosphate ...

The physiological effects of glucocorticoids (GCs) are, at least in part, mediated by an inhibition of cell proliferation. More contentious is their anti-proliferative action and possible tumour modifying effects in neoplastic tissues. Central to the action of GCs in target tissues is the expression and function of two isozymes of 11beta-hydroxysteroid dehydrogenase (11beta-HSD) that serve to interconvert active cortisol (F) and inactive cortisone (E). 11beta-HSD type 1 (11bet...

11beta-hydroxysteroid dehydrogenase type 1 (11B-HSD1) catalyses the inter-conversion of cortisone and cortisol, and has been implicated in the pathogenesis of a number of disorders including insulin resistance and obesity. The enzyme is a glycosylated membrane-bound protein, located in the lumen of the endoplasmic reticulum (ER) and has proved difficult to purify in an active state. Previously, we reported the successful expression and purification of human 11B-HSD1 from E. co...

In human granulosa-lutein (hGL) cells, cortisol (F) is inter-converted with cortisone (E) by 11BHSD. To date two isoforms of 11BHSD have been cloned. Human granulosa cells have been shown to express 11BHSD2 mRNA during the follicular phase of the ovarian cycle, switching to 11BHSD1 mRNA expression as luteinization occurs. However, it is not known whether (1) the protein expression, and (2) the 11BHSD enzyme activities reflect this pattern of mRNA expression. Hence, the aims of...

The key enzymes in the terminal stages of human adrenal gland corticosteroid biosynthesis are aldosterone synthase (AS) and 11beta-hydroxylase (11beta-OHase). Their amino acid sequences differ by only 7% but they exhibit markedly different enzymatic activities. AS is expressed solely in the zona glomerulosa and converts 11-deoxycorticosterone (DOC) to aldosterone whereas 11beta-OHase is expressed mainly in the zona fasciculata and produces cortisol from 11-deoxycortisol. The 3...

Objective : to estimate the activative and adhesive ability of leucocytes and endothelial cells in active PDR ( with neovascularisation ).Materials and methods : 17 young patients, age mediana 26,4 years, with Diabetes Type 1 and active PDR were compared with 17 healthy controls. ICAM-1 (CD 54) on the surface of lymphocytes and granulocytes was measured by flow cytometry ' Becton Dickinson '.Serum soluble E - selectin ( CD 62 ) was identified by ELISA ( 'R and D', UK ).Mean Di...

Objective : to estimate the activative and adhesive ability of leucocytes and endothelial cells in active PDR ( with neovascularisation ).Materials and methods : 17 young patients, age mediana 26,4 years, with Diabetes Type 1 and active PDR were compared with 17 healthy controls. ICAM-1 (CD 54) on the surface of lymphocytes and granulocytes was measured by flow cytometry ' Becton Dickinson '.Serum soluble E - selectin ( CD 62 ) was identified by ELISA ( 'R and D', UK ).Mean Di...

11beta-hydroxysteroid dehydrogenase type 1 (11beta-HSD1) activates cortisol (F) from cortisone (E). Our recent human studies identified 11beta-HSD1 to the non-pigmented layer (NPE) of the ocular ciliary epithelium, confirming that this enzyme is integral to the physiology of aqueous humour (AH) production vital for the maintenance of intraocular pressure (IOP). 11beta-HSD1 has also been implicated in the pathogenesis of obesity, and our previous data have defined this enzyme i...