Abstract:
BACKGROUND AND OBJECTIVE:In polycystic ovary syndrome (PCOS) inappropriate gonadotrophin secretion is characterized by increased pulse frequency and amplitude, elevated 24-h mean serum concentrations, and greater responses to GnRH. While the mechanism(s) responsible for this increased release of LH are not well understood, enhanced LH secretion has been attributed to increased pituitary sensitivity to GnRH and feedback influences from circulating steroid hormones. To address these considerations, we conducted a study to examine the relationships between GnRH-stimulated LH responses, episodic gonadotrophin secretion, and baseline measurements of endocrine-metabolic function in PCOS. PATIENTS:Serum LH responses to sequential multidose GnRH administration and pulsatile gonadotrophin secretion were examined in 13 PCOS and 13 normal women. MEASUREMENTS:Serum LH, steroid hormone, insulin and glucose levels were determined in blood samples obtained during assessment of episodic gonadotrophin secretion and LH responses to GnRH stimulation. DESIGN:Each subject was studied on two consecutive days. On study day 1 each subject underwent frequent blood sampling every 10 min for 12 h. On study day 2 each received sequential doses of GnRH, 2 microg, 10 microg and 20 microg, administered intravenously at 4-h intervals over a continuous 12-h period. RESULTS:Serum LH responses following GnRH were markedly greater in PCOS compared to normal women, as expected. In individual PCOS, peak LH responses to GnRH were significantly correlated with corresponding basal LH and LH pulse amplitude, but not LH pulse frequency. In the PCOS group, LH responses were positively correlated with serum oestradiol (E2) and inversely related to body mass index (BMI). Between-group differences in LH responsiveness disappeared when controlling for serum testosterone (T) levels. CONCLUSIONS:These results indicate that the absolute LH increment following GnRH is largely dependent on baseline LH levels and may account for the well-documented difference in LH responsiveness between PCOS and normal women. That neither LH responses to GnRH nor LH pulse amplitude were correlated to LH pulse frequency suggests involvement of other factors along with GnRH to account for increased LH secretion in PCOS. In addition to E2 and BMI, serum testosterone appears to be, at least in part, responsible for differences in LH secretion and release between PCOS and normal women.
journal_name
Clin Endocrinol (Oxf)journal_title
Clinical endocrinologyauthors
Patel K,Coffler MS,Dahan MH,Malcom PJ,Deutsch R,Chang RJdoi
10.1111/j.1365-2265.2004.01945.xkeywords:
subject
Has Abstractpub_date
2004-01-01 00:00:00pages
67-74issue
1eissn
0300-0664issn
1365-2265pii
1945journal_volume
60pub_type
杂志文章abstract:OBJECTIVE:The body adiposity index (BAI) has been recently proposed as an alternative index to body mass index (BMI) and waist circumference (WC) to evaluate adiposity in adults, with special focus on its ability to discriminate gender specificities on adiposity. Endothelial dysfunction, circulating endothelial cells (...
journal_title:Clinical endocrinology
pub_type: 杂志文章
doi:10.1111/cen.12195
更新日期:2013-11-01 00:00:00
abstract::In 44 patients with acromegaly treated by transsphenoidal pituitary microsurgery, the relationship between changes in pre- and post-operative GH dynamics and postoperative fasting plasma GH levels was examined to clarify which is the optimal approach for evaluating postoperative removal of the tumour. TRH, LHRH and br...
journal_title:Clinical endocrinology
pub_type: 杂志文章
doi:10.1111/j.1365-2265.1986.tb01677.x
更新日期:1986-08-01 00:00:00
abstract::1 alpha, 25-Dihydroxycholecalciferol (1,25-(OH)2D3) has been measured in human serum by radioimmunoassay. The assay uses a high titre antiserum raised in sheep against 1,25-(OH)2D3-25-hemisuccinate, conjugated to bovine serum albumin. The sensitivity of the assay is 10 pg/tube. Other hydroxylated forms of vitamin D3 c...
journal_title:Clinical endocrinology
pub_type: 杂志文章
doi:10.1111/j.1365-2265.1979.tb03068.x
更新日期:1979-01-01 00:00:00
abstract:OBJECTIVE:Recently, a somatic point mutation of the BRAF gene (V599E) has been identified as the most common genetic event in papillary thyroid carcinoma (PTC) with a variable frequency (about 25-70%) in different series from USA, Japan, Portugal and Ukraine. DESIGN:In the present study, the genetic analysis of BRAF i...
journal_title:Clinical endocrinology
pub_type: 杂志文章
doi:10.1111/j.1365-2265.2004.02089.x
更新日期:2004-08-01 00:00:00
abstract::To explore the mechanism for the hypogonadism associated with prolactin hypersecretion in men we examined luteinizing hormone (LH) secretory profiles in four hyperprolactinaemic men before and during treatment with bromocriptine. Pretreatment serum prolactin levels were increased 4-100 fold and serum testosterone leve...
journal_title:Clinical endocrinology
pub_type: 杂志文章
doi:10.1111/j.1365-2265.1984.tb03467.x
更新日期:1984-09-01 00:00:00
abstract:OBJECTIVE:In the 8th edition American Joint Committee on Cancer (AJCC) tumour-node-metastasis (TNM) staging system (TNM-8), changes have been made regarding anaplastic thyroid carcinoma (ATC) compared with the 7th edition (TNM-7). The major changes are that anaplastic ATC now has the same T stage definitions as differe...
journal_title:Clinical endocrinology
pub_type: 杂志文章
doi:10.1111/cen.14371
更新日期:2020-12-26 00:00:00
abstract:OBJECTIVE:There are advantages and disadvantages with all of the presently available types of testosterone replacement for hypogonadal men. We performed this investigation to establish detailed data about the pharmacokinetics, pharmacodynamics, feasibility and side-effects of subcutaneously implanted testosterone (T) p...
journal_title:Clinical endocrinology
pub_type: 杂志文章
doi:10.1111/j.1365-2265.1996.tb02061.x
更新日期:1996-07-01 00:00:00
abstract:CONTEXT:Transient thelarche (TT), that is, the appearance, regression and subsequent reappearance of breast buds, is a frequent phenomenon, but little is known about pubertal transition in these girls. OBJECTIVE:To describe pubertal progression, growth, genotypes, reproductive hormones and growth factors in girls with...
journal_title:Clinical endocrinology
pub_type: 杂志文章
doi:10.1111/cen.14248
更新日期:2020-09-01 00:00:00
abstract::We have studied the effects of dopamine on the secretion of TSH and its subunits in vivo and in vitro. Four normal controls, seven patients with primary hypothyroidism, two patients with peripheral resistance to thyroid hormone (PRTH), and two patients with alpha-secreting pituitary tumours underwent a 3-h dopamine in...
journal_title:Clinical endocrinology
pub_type: 杂志文章
doi:10.1111/j.1365-2265.1983.tb03211.x
更新日期:1983-03-01 00:00:00
abstract:OBJECTIVE:The purpose of this investigation was to evaluate the effectiveness of short-term administration of recombinant biosynthetic IGF-I on patients with an hereditary inability to generate this hormone. DESIGN AND PATIENTS:Ten patients with Laron type dwarfism (LTD) (4 males, six females) aged 3 1/2 to 37 3/4 yea...
journal_title:Clinical endocrinology
pub_type: 临床试验,杂志文章
doi:10.1111/j.1365-2265.1991.tb03513.x
更新日期:1991-08-01 00:00:00
abstract::The concentration of immunoreactive inhibin in serum was measured in three pregnant women with premature ovarian failure involved in a donor oocyte in-vitro fertilization programme. Inhibin was not detectable in peripheral serum prior to conception but rose within 2-4 weeks of embryo transfer, whereafter levels rose g...
journal_title:Clinical endocrinology
pub_type: 杂志文章
doi:10.1111/j.1365-2265.1987.tb02949.x
更新日期:1987-12-01 00:00:00
abstract:OBJECTIVE:Studies assessing quality of life in GH-deficient adults have shown varying results. This may be due to a number of factors including varying causes of GH deficiency, the use of radiotherapy in treatment and patient selection. We aimed to assess whether anterior pituitary hormone deficiency or external pituit...
journal_title:Clinical endocrinology
pub_type: 杂志文章
doi:10.1046/j.1365-2265.1997.1400957.x
更新日期:1997-04-01 00:00:00
abstract:OBJECTIVE:To determine the interest of Chromogranin A (CgA) determination for diagnosis and follow-up in patients with gastroenteropancreatic endocrine tumours (GEP-ET) and multiple endocrine neoplasia type 1 (MEN-1). PATIENTS AND METHODS:CgA levels were measured with an immunoradiometric assay in 124 sporadic GEP-ET,...
journal_title:Clinical endocrinology
pub_type: 杂志文章
doi:10.1111/j.1365-2265.2004.02030.x
更新日期:2004-05-01 00:00:00
abstract:OBJECTIVE:Women with impaired glucose tolerance (IGT) and type 2 diabetes (T2D) are more at risk of cardiovascular disease. The aim of this study was to test the hypothesis that increased visceral adipose tissue (VAT) could explain to a large extent alterations in the cardiovascular disease risk profile of postmenopaus...
journal_title:Clinical endocrinology
pub_type: 杂志文章
doi:10.1111/j.1365-2265.2010.03933.x
更新日期:2011-03-01 00:00:00
abstract:OBJECTIVE:Although autoantibody production is a key feature of autoimmunity, it is not known whether variation in autoantibody production and clearance pathways is involved in disease susceptibility. The Fc Gamma Receptor IIa (FcGRIIa) molecule is involved in the clearance of autoantibodies and a functional single nucl...
journal_title:Clinical endocrinology
pub_type: 杂志文章
doi:10.1111/j.1365-2265.2010.03780.x
更新日期:2010-07-01 00:00:00
abstract::It has been reported that administration of nomifensine (Nom) or of L-dopa + carbidopa (L-dopa + Carb) potentiates central dopaminergic tonus, resulting in decreased prolactin (PRL) secretion. It has been proposed that these drugs would help to discriminate patients with PRL-secreting pituitary tumours from those with...
journal_title:Clinical endocrinology
pub_type: 杂志文章
doi:10.1111/j.1365-2265.1980.tb03420.x
更新日期:1980-12-01 00:00:00
abstract:OBJECTIVE:We aimed to elucidate the accuracy and limitations of [(18)F]-fluoro-L-dihydroxyphenylalanine ([(18) F]DOPA) positron emission tomography (PET) for Japanese patients with congenital hyperinsulinism. Although [(18)F]DOPA PET is reported to be useful for precisely localizing the focal form of congenital hyperin...
journal_title:Clinical endocrinology
pub_type: 杂志文章
doi:10.1111/j.1365-2265.2011.04072.x
更新日期:2011-09-01 00:00:00
abstract::Changes in the excretion of urinary cyclic AMP, calcium and phosphate, and serum calcium, ionized calcium, and magnesium were studied after parathyroidectomy for primary hyperparathyroidism. Urinary cyclic AMP decreased rapidly and 8 of 11 patients had a significant reduction 1 h postoperatively, but changes in serum ...
journal_title:Clinical endocrinology
pub_type: 杂志文章
doi:10.1111/j.1365-2265.1983.tb00581.x
更新日期:1983-04-01 00:00:00
abstract:OBJECTIVE:The aim was to study the relationship between growth hormone (GH) and insulin-like growth factor-I (IGF-I) in critically ill patients. DESIGN:Case-control study of critically ill patients admitted to the intensive care unit was carried out. PATIENTS:Six critically ill patients (51-78 years) who required ven...
journal_title:Clinical endocrinology
pub_type: 杂志文章
doi:10.1111/j.1365-2265.1991.tb03495.x
更新日期:1991-07-01 00:00:00
abstract:OBJECTIVES:There is growing evidence for the association between bone mineral density (BMD) and vascular calcification, which is related to cardiovascular disease. Coronary multidetector row computed tomography (MDCT) is a noninvasive tool developed to evaluate coronary status precisely. We used MDCT to evaluate this a...
journal_title:Clinical endocrinology
pub_type: 杂志文章
doi:10.1111/j.1365-2265.2009.03535.x
更新日期:2009-11-01 00:00:00
abstract::We designed a systematic study of patients with Cushing's disease to compare the results of acute experiments with cyproheptadine, sodium valproate and bromocriptine with the results of chronic treatment with sodium valproate. In 13 patients the plasma cortisol response to single doses of 2.5 mg bromocriptine, 6 mg cy...
journal_title:Clinical endocrinology
pub_type: 杂志文章
doi:10.1111/j.1365-2265.1986.tb03621.x
更新日期:1986-12-01 00:00:00
abstract::Sixteen consecutive cases of Cushing's disease were treated by radical transphenoidal hypophysectomy. Surgical removal was not possible in two cases. Of the other 14, there was total clinical and biochemical remission of the disease in 13 and partial remission in one. Some form of replacement therapy has been necessar...
journal_title:Clinical endocrinology
pub_type: 杂志文章
doi:10.1111/j.1365-2265.1983.tb00041.x
更新日期:1983-11-01 00:00:00
abstract:CONTEXT:Peroxisome proliferator-activated receptor gamma (PPAR-gamma) agonists such as thiazolidinediones (TZDs) improve insulin sensitivity in type 2 diabetes mellitus (T2DM) through effects on fat metabolism whereas GH stimulates lipolysis and induces insulin resistance. OBJECTIVE:To evaluate the impact of TZDs on f...
journal_title:Clinical endocrinology
pub_type: 杂志文章,随机对照试验
doi:10.1111/j.1365-2265.2008.03231.x
更新日期:2008-09-01 00:00:00
abstract:OBJECTIVES:Localization of ectopic ACTH-secreting tumours causing Cushing syndrome (ECS) is essential for clinical management, yet often difficult. [68 Ga]-DOTATATE PET/CT ([68 Ga]-DOTA-(Tyr3 )-octreotate)] is an FDA-approved high-resolution diagnostic tool for imaging neuroendocrine tumours. Data on the clinical utili...
journal_title:Clinical endocrinology
pub_type: 杂志文章,多中心研究
doi:10.1111/cen.14008
更新日期:2019-08-01 00:00:00
abstract:OBJECTIVE AND DESIGN:Hypopituitarism, in particular GH deficiency, is prevalent in patients with clinically nonfunctioning pituitary adenomas (NFPAs) both before and after surgery. The factors regulating the growth of pituitary adenomas in general and residual tumour tissue in particular are not fully characterized, an...
journal_title:Clinical endocrinology
pub_type: 杂志文章
doi:10.1111/j.1365-2265.2004.02022.x
更新日期:2004-05-01 00:00:00
abstract::Pituitary homogenates were prepared from patients undergoing pituitary ablation for breast or prostatic carcinoma (controls) and from patients with either PRL- and GH-secreting pituitary adenomas or from patients with 'functionless' pituitary tumours. The principal subcellular organelles, plasma membrane, lysosomes, m...
journal_title:Clinical endocrinology
pub_type: 杂志文章
doi:10.1111/j.1365-2265.1984.tb01389.x
更新日期:1984-11-01 00:00:00
abstract:OBJECTIVE:The distinction between constitutional delay of growth and puberty (CDGP) and isolated hypogonadotropic hypogonadism (IHH) in males with delayed puberty is difficult but important for timely treatment. We assessed the accuracy of the GnRH agonist test (triptorelin 0·1 mg) in comparison with inhibin B alone or...
journal_title:Clinical endocrinology
pub_type: 杂志文章
doi:10.1111/cen.12613
更新日期:2015-01-01 00:00:00
abstract::Computed tomography of the pituitary fossa was performed in 12 patients with primary hypothyroidism before and after thyroxine treatment. In three, herniation of the diaphragma sellae precluded accurate measurement of the density of the hypophysis. Eight of the remaining patients showed abnormally increased density of...
journal_title:Clinical endocrinology
pub_type: 杂志文章
doi:10.1111/j.1365-2265.1985.tb02997.x
更新日期:1985-05-01 00:00:00
abstract::A review of the genetics of male undermasculinization must encompass a description of the embryology of the genital system. The dimorphism of sex development consequent upon the formation of a testis and the subsequent secretion of hormones to impose a male phenotype is highlighted. Thus, an understanding of the cause...
journal_title:Clinical endocrinology
pub_type: 杂志文章,评审
doi:10.1046/j.1365-2265.2002.01430.x
更新日期:2002-01-01 00:00:00
abstract::The in-vivo reaction of the plasma GH concentration to the administration of the somatostatin analogue SMS 201-995, bromocriptine and their combination were compared with the in-vitro effects of both compounds and their combination on GH release and the GH tumour cell content of 9 acromegalic patients. Exposure of cul...
journal_title:Clinical endocrinology
pub_type: 杂志文章
doi:10.1111/j.1365-2265.1987.tb00834.x
更新日期:1987-07-01 00:00:00