Endocrine Abstracts

For decades, measurements of the circulating concentrations of GH and IGF1 have constituted a mainstay in the diagnosis and clinical management of GH disorders. However, it is also well-known that considerable discrepancies exist between different assays, resulting in highly assay dependent results. Therefore, in 2009 an International Expert Committee was established with the aim to produce an international consensus statement on the standardization and evaluation of GH and IG...

Introduction: Type 1 diabetes (T1D) is characterized by primary insulin insufficiency and secondary disruption of GH–IGF–IGFBP axis. S.c. insulin therapy is necessary to normalize this axis. This study aimed to investigate whether the distinct insulin profiles obtained with insulin aspart and human insulin preparations, respectively, affect IGF1 concentration and bioactivity and IGFBP levels differently.Methods: In a randomized, four-period cro...

Background: Visceral adipose tissue (VAT) is less insulin sensitive and more harmful than subcutaneous adipose tissue (SAT). In adipocytes, IGF1 receptor signaling has been linked to insulin resistance, but it is unknown whether VAT and SAT also differ in production of IGFs. Therefore, we compared IGFs, IGFBP-4 and PAPP-A production in cultured fragments of VAT and SAT from obese subjects.Methods: VAT and SAT was collected perioperatively during elective...

Context and objective: During fasting growth hormone (GH) promotes lipolysis, attenuates glucose oxidation and preserves protein. Previous studies have primarily been conducted in GH deficient patients or during somatostatin-suppression of GH secretion. We aimed to study the impact of the fasting associated increase in GH without concomitant changes in other hormones, by the means of GH receptor (GHR) blockade.Design: Ten healthy young men participated i...

Objectives: Insulin resistance (IR) is a very common metabolic abnormality in obesity, which is often associated with reduced growth hormone (GH) secretion. GH deficiency is associated with increased in intra-abdominal fat and several parameters of the metabolic syndrome. IGF-I improves IR but the IGF-binding proteins are supposed to regulate its bioactivity although only little information exists. We postulated that the elevated insulin levels due to IR do not only suppress G...

Objective: To investigate the effect of pioglitazone on cortisol metabolism in PCOS.Design: Thirty insulin resistant PCOS patients were randomized to either 16 weeks of pioglitazone (30 mg/day) or placebo treatment. Before and after intervention, patients underwent 24 h 20 min.-integrated blood sampling for measurement of cortisol and 24 h excretion of cortisol, cortisone and steroid metabolites (cortisol, corticosteron, androgen, and 17-hydroxyprogester...

Background: A general finding among previous illicit androgen male users is persistently lower serum testosterone than nonusers and may be caused by reduced pituitary luteinising hormone (LH) secretion. However, the functional capacity of the testes and pituitary remains to be assessed after androgen use. We compared pituitary-testis-axis capacity in previous illicit androgen users and nonusers.Methods: We conducted a cross-sectional study including men ...

Background: Somatostatin analogue treatment (SA) is used in acromegaly to suppress GH secretion and tumour growth. In addition, SA also suppresses insulin secretion and may impact on GH signalling in peripheral tissues.Objective: To compare GH and insulin signalling in skeletal muscle and adipose tissue in vivo before and after a single exogenous GH bolus in patients with acromegaly controlled by either surgery alone or by ongoing treatment with a slow-r...

Background: The mechanisms underlying the association between severe hypoglycaemia and increased cardiovascular mortality among patients with diabetes mellitus are not fully understood. Our aim was to evaluate changes in GH/IGF1 axis during insulin-induced hypoglycaemia, as a possible link.Methods: Twenty-five healthy subjects, 12 obese participants (OP; 6/ 6; 34.4±1.7 kg/m2), and 13 healthy lean participants (LP; 6/ 7; 21.7±0.6 kg/m...

Purpose: Although quality of life (QoL) is improved in patients with acromegaly after disease control, QoL correlates only weakly with traditional biomarkers. Our objective is to investigate a potential relation between the new serum biomarker soluble Klotho (sKlotho), GH and insulin-like growth factor 1 (IGF-1) levels and QoL.Methods: In this prospective cohort study, we investigated 54 acromegaly patients biochemically well-controlled on combination tr...