Endocrine Abstracts

Introduction: Oral glucose tolerance test (OGTT) allows classification of subjects in 3 groups, depending on glycaemia 120 minutes after 75 g glucose ingestion: normal (glycaemia < 1.4 g/L), glucose intolerant (1.4–2 g/L) and diabetic (>2 g/L). Five insulin profiles associated with different incidence rates of diabetes over 10 years of follow-up have also previously been described. Insulin measurement is very sensible to hemolysis and can advantageously be replace...

Introduction: Testosterone circulates under different forms in blood, mainly bound to proteins i.e. Sex Hormone Binding Globulin (SHBG) and albumin. Free testosterone (FT), the biologically active form, represents 2% of total testosterone (TT). FT measurement is mainly indicated when TT level is discordant with clinical picture but remains technically challenging. Indeed, as for all free hormones, gold standard method relies on equilibrium dialysis, unusable in routine. Direct...

Introduction: Biotin (vitamin B8) is a coenzyme of carboxylases involved in many metabolic pathways and also used in therapeutics as a dietary supplement (diffuse alopecia)(<30 mg/day), in the treatment of rare congenital enzymatic deficiencies (5–40 mg/day) or more recently in the treatment of progressive multiple sclerosis at higher doses (300 mg/day). At such high doses, interferences with thyroid hormones assays using biotin-streptavidin amplification system were ...

Introduction: Biochemical follow up of the ovarian function after ovarian stimulation is restricted to the measurement of serum oestradiol and progesterone. We aim to investigate the entire ovarian steroidognesis after ovarian stimulation.Materials and methods: 50 women (26 IVF and 24 ICSI) who underwent AMP induction (based on rFSH stimulation after GnRH agonist or antagonist) for the same cause of infertility were retrospectively involved and compared ...

Introduction: Insulinoma is the most frequent functional endocrine tumor of the pancreas but remains rare with an incidence of less than 5 cases by million and by year. It is often sporadic but can occur in the context of MEN1 in about 5% of cases, being then readily multiple. Clinically, it is typically responsible for fasting hypoglycemic episodes. Only one case of multiple insulinomas, with no obvious argument for MEN1 context, has previously been reported (Babic an al., <e...

Mitotane (o.p’DDD, Lysodren) is used to treat adrenortical carcinoma and Cushing syndromes. It is catabolised into o.p’DDA and o.p’DDE. It is lowly protein-bound but its tropism for lipids is high. It has multiple side effects on the digestive gut increasing alkaline phosphatases and cholesterol. Patients treated with mitotane have been described as having decreased FT4 levels without any signs of hypothyroidism. We wanted to know whether this is due to an analy...

Placenta is an endocrine organ, secreting steroids (progesterone [P4], estrogens) and hCG, thanks to villous tissu (cytotrophoblasts [VCT] and syncytiotrophoblast [ST]). P4 is required for implantation and maintenance of pregnancy. P4 is synthetized from maternal cholesterol thanks to mitochondrial transporter MLN64 and P450SCC and HSD3B1 enzymes. We aimed to characterize P4 production in human placenta during VCTs differentiation into ST in vitro. VCTs isolated from ...

Introduction: Osilodrostat is a new 11 ß-hydroxylase inhibitor with a mode of action analogue to metyrapone. It has become increasingly used in recent years for treatment of Cushing’s Syndrome (CS). However, few in vivo studies are currently available to accurately compare both drugs characteristics. The objective of our study was to compare steroidogenic profiles in patients treated by either Osilodrostat or Metyrapone for ACTH-dependent CS.Me...

Introduction: Biological diagnosis of Cushing syndrome relies on three parameters: 24 hours-free urinary cortisol; serum cortisol after 1 mg dexamethasone suppression test; late-night serum or salivary cortisol. These tests allow the diagnosis of cortisol excess but do not help in etiological diagnosis, particularly in the distinction between pseudo-Cushing and ACTH-dependent Cushing syndrome, which is often challenging. The aim of this study was to evaluate the performances o...

IntroductionFasting trial remains the gold standard to confirm the diagnosis of insulinoma, based on low blood glucose level concomitant with inadequate high insulin level. However, diagnostic criteria are not consensual. Glycemia and insulin thresholds differ between the different consensus statements : endogenous hyperinsulism diagnosis relies on a glycemia < 3 mmol/l associated with an insulin level > 3 mUI/l in Endocrine Society guidelines (2009)...