Endocrine Abstracts

Introduction: The syndrome of late-onset hypogonadism (LOH) is a clinical and biochemical syndrome associated with advancing age male, characterized by typical symptoms and decreased serum concentrations of testosterone, which can affect multiple organ systems and may impair quality of life. The prevalence of LOH syndrome is higher in certain patient groups, obese, diabetic and suffering from erectile dysfunction manifest LOH at higher rates than the general population.<p ...

Introduction: During a normal menstrual cycle, serum levels of luteinizing hormone (LH), follicle-stimulating hormone (FSH), estradiol (E2), and progesterone (P4) can vary widely between cycles for the same woman, as well as between different women. Reliable reference values based on the local population are important for correct interpretation of laboratory results.Aims: To evaluate the discrepancy of the results on fertility hormones by two different t...

Introduction: Reference ranges for classifying a patient as hyper-, normo- and hypothyroidism vary from one laboratory to another, because the techniques used, regional factors (race, iodine..), but there is also the variables of age and sex of the patient are not taken. Article Thyroid Volume 21, Number 1, 2011, 5–11 Boucai et al, published equations to adjust the normal range in terms of these variables. Evaluate these equations and see if there are significant changes ...

Androgen deficiency in the aging male has become an actual topic due to the aging population and finding from different studies that shown a progressive decline of serum levels of age-related testosterone. These levels have been inversely related with markers of metabolic syndrome and cardiovascular disease.The aim of this observational study was to investigate the relation of endogenous testosterone and other sex hormones with different components of me...

G protein-coupled receptors (GPCRs) are critical for signal transduction within neuroendocrine signalling pathways, and genetic mutations in G protein-coupled GPCRs underlie numerous diseases. Inactivating GPCR mutations can impede ligand interactions or signal transduction, or can result in misfolding of nascent receptor proteins and subsequent retention in the endoplasmic reticulum (ER) and thus failure to traffic to the cell surface. Examination of the functionality and cel...

Aims: Low circulating testosterone levels are associated with increased cardiovascular risk and there is evidence that androgens inhibit arterial lesion formation. This investigation addressed the hypothesis that androgens directly inhibit neointimal lesion formation by stimulation of vascular androgen receptor.Methods and results: Mice were generated with selective deletion of androgen receptor from vascular (endothelial or smooth muscle) cells. Castrat...

Our previous studies of the gene responsible for the expression of pituitary GH (GH1 gene) have identified 13 novel missense mutations in 52 children with short stature and 154 controls, which occurred more frequently in patients than controls. These mutations result in expression of variant forms of GH with a single amino acid alteration that could lead to conformational changes within the protein, possibly resulting in cleavage sites hidden in wild-type GH becoming ex...

A child with short stature having height greater than 2 standard deviations below the mean for age and bone age delay of two years but with normal growth hormone secretion tests was identified. Since there was no known clinical cause of the short stature, it was decided to sequence both alleles of the patient's GH1 gene that encodes pituitary GH to determine whether there was a genetic defect responsible for the observed phenotype (with local ethical approval). A 3.2kb fragmen...

The chicken gonadotropin-releasing hormone receptor (cGnRH-R) is notable for having a cytoplasmic carboxyl-terminal tail, which is not present in the mammalian GnRH-Rs. We have previously shown that the cGnRH-R undergoes rapid agonist-induced internalization, and requires the carboxyl-terminal tail for this process. To investigate the role of the carboxyl-terminal tail of the cGnRH-R in relation to its rapid internalization, and to identify the key residues involved, a series ...

Introduction: In gender affirming therapy of the transgender male, increasing doses of testosterone are administered and as the androgen dose increases, various biochemical parameters such as haematocrit, creatinine and PSA increase. It is not known whether any parameters have advantages in monitoring this androgenisation. Our study evaluates the correlation between the increase in androstanediol glucuronide, testosterone, free testosterone and free androgen index (FAI) with t...