Abstract:
BACKGROUND:In men, the feedback of gonadotropins is regulated by estrogens that come from the aromatization of testosterone, but the relative contribution to the inhibition of LH and FSH secretion by the amount of locally produced estrogens within the hypothalamus and/or the pituitary, and the amount of circulating estrogens still remains unknown. OBJECTIVE:In order to evaluate the effect of regulation induced by estradiol on the hypothalamic-pituitary-gonadal (HPG) axis, we studied the pulsatility of LH and FSH in two aromatase-deficient men (called subject 1 and subject 2), in which the production rate of estrogen (both local and circulating) is completely, or at least severely, impaired. DESIGN:FSH and LH were evaluated in terms of their pulsated secretion and as GnRH-stimulated secretion in two phases: phase 1, before estrogen treatment; and phase 2, during estrogen treatment with 25 microg transdermal estradiol twice weekly. METHODS:Blood samples were taken during phase 1 and phase 2 at 0800 h for basal measurements of LH, FSH, inhibin B, testosterone, and estradiol. The analysis of the pulsatility of LH and FSH was performed by sampling every 10 min for 8 h in the two phases. Gonadotropin response to GnRH-stimulation test was studied by serial standard sampling after 100 microg GnRH i.v. bolus in phases 1 and 2. RESULTS:Estrogen treatment led to a significant reduction in both LH-pulsated frequency (7.5 +/- 0.7 in phase 1, 4.5 +/- 0.7 in phase 2) and amplitudes (3.5 +/- 0.006 in phase 1, 1.9 +/- 0.4 in phase 2) of peaks, whereas FSH showed only a conspicuous reduction in serum levels and a trend towards the reduction of the amplitudes of its peaks without modification of the frequency of the pulses. Both testosterone and gonadotropins decreased during phase 2, whereas estradiol reached the normal range in both subjects. Transdermal estradiol treatment significantly lowered the peaks of both serum LH and FSH after GnRH as well as the incremental area under the curve after GnRH administration in both subjects. Basal serum inhibin B levels were slightly higher before transdermal estradiol treatment (phase 1) than during estrogen treatment (phase 2) in both subjects. CONCLUSIONS:The administration of estrogen to aromatase-deficient men discloses the effects of circulating estrogens on LH secretion, exerted both at pituitary level, as shown by the decrease of basal and GnRH-stimulated secretion of LH and the LH pulsed amplitude, and at hypothalamic level as shown by the reduction of the frequency of LH pulses. The present study, coupling the outcomes of basal, GnRH-stimulated and the pulsatile evaluation of LH and FSH secretion in two aromatase-deficient men, demonstrates that circulating estrogens play an inhibitory role in LH secretion by acting on the hypothalamus and the pituitary gland of men. The discrepancy among testosterone levels, the arrest of spermatogenesis and a slightly inappropriate respective increase of serum FSH (lower than expected) suggests a possible role of estrogens in the priming and the maturation of HPG axis in men, an event that has never occurred in these two subjects as a consequence of chronic estrogen deprivation.
journal_name
Eur J Endocrinoljournal_title
European journal of endocrinologyauthors
Rochira V,Zirilli L,Genazzani AD,Balestrieri A,Aranda C,Fabre B,Antunez P,Diazzi C,Carani C,Maffei Ldoi
10.1530/eje.1.02254subject
Has Abstractpub_date
2006-10-01 00:00:00pages
513-22issue
4eissn
0804-4643issn
1479-683Xpii
155/4/513journal_volume
155pub_type
杂志文章abstract:OBJECTIVE:A phase I single centre, open label study of the pharmacokinetics and tolerability of a buccal testosterone tablet (COL 1621) was carried out. DESIGN:Twelve testosterone-deficient males were treated with the buccal tablet twice daily for 7 consecutive days. Multiple blood samples were drawn for testosterone,...
journal_title:European journal of endocrinology
pub_type: 临床试验,杂志文章
doi:10.1530/eje.0.1500057
更新日期:2004-01-01 00:00:00
abstract::Gene therapy for endocrine diseases represents an exciting new type of molecular intervention that may be a curative one. Endocrine disorders that might be treated by gene therapy include monogenic diseases, such as GH deficiency and hypothalamic diabetes insipidus, and multifactorial diseases, such as diabetes mellit...
journal_title:European journal of endocrinology
pub_type: 杂志文章,评审
doi:10.1530/eje.0.1430447
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abstract:OBJECTIVE:The acute decrease in iodide organification in the thyroid in response to excess iodide is termed the acute Wolff-Chaikoff effect and normal organification resumes in spite of continued high plasma iodide concentrations (escape from the acute Wolff-Chaikoff effect). We have recently reported that large doses ...
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doi:10.1530/eje.0.1440139
更新日期:2001-02-01 00:00:00
abstract:OBJECTIVE:Serum concentrations of soluble tumor necrosis factor-alpha (TNF-alpha) receptor 2 (sTNFR2) are associated with insulin resistance. In a recent study, we provided evidence for the existence of a biologically active form of sTNFR2 produced by alternative splicing (DS-TNFR2). We aimed to evaluate whether this c...
journal_title:European journal of endocrinology
pub_type: 杂志文章
doi:10.1530/eje.1.02145
更新日期:2006-05-01 00:00:00
abstract:UNLABELLED:In healthy boys, the pituitary-gonadal axis exhibits diurnal variation in early puberty. Serum testosterone levels are higher during the night and low or immeasurable during the day. These fluctuating levels of circulating androgens in early pubertal boys are difficult to monitor. Prostate specific antigen (...
journal_title:European journal of endocrinology
pub_type: 杂志文章
doi:10.1530/eje.0.1360401
更新日期:1997-04-01 00:00:00
abstract:OBJECTIVE:To compare clinical and humoral parameters before and after surgery in patients with incidental adrenocortical adenomas. DESIGN:Six patients with subclinical Cushing's syndrome and nine with non-functioning adenomas were investigated before and 12 Months after removal of the mass. METHODS:Anthropometric (bo...
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doi:10.1530/eje.0.1480213
更新日期:2003-02-01 00:00:00
abstract:AIM:It is widely known that inflammation is related to type 2 diabetes (T2D), but few studies have shown a direct relationship between the immune system and T2D using a reliable biomarker. Neutrophil:lymphocyte ratio (NLR) is an easy-to-analyze inflammation biomarker, but few studies have assessed the relationship betw...
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pub_type: 杂志文章,随机对照试验
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更新日期:2015-08-01 00:00:00
abstract:CONTEXT AND OBJECTIVE:The precise diagnosis of partially virilised women with 46,XY disorders of sex development (DSD) is often obscure. In practice, this group often comes under the poorly defined, clinically based label of partial androgen insensitivity syndrome (PAIS). In a previous study, we found that 5α-reductase...
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pub_type: 临床试验,杂志文章
doi:10.1530/eje.1.01905
更新日期:2005-05-01 00:00:00
abstract::Effective diabetes care requires a partnership between prepared, proactive practice teams and informed, activated patients. Diabetes education helps to overcome many of the barriers to effective self-management by enabling people with diabetes to make informed decisions about their day-to-day self-care. Both psychosoc...
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pub_type: 杂志文章,评审
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abstract:OBJECTIVE:TSH-secreting pituitary tumors (TSH-omas) are a rare cause of hyperthyroidism and account for <1% of all pituitary adenomas. Failure to recognize the presence of a TSH-oma may result in dramatic consequences such as thyroid ablation that may cause further growth in pituitary tumor. The primary goal of the tre...
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更新日期:2007-07-01 00:00:00
abstract:OBJECTIVE:To investigate the effect of Rosiglitazone in three patients treated with bilateral adrenalectomy followed by hyperpigmentation and hypersecretion of ACTH. PATIENTS AND METHODS:One patient had increasing ACTH after previous transsphenoidal surgery for Nelson's syndrome, and two patients without pituitary ade...
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pub_type: 杂志文章
doi:10.1530/eje.1.01994
更新日期:2005-10-01 00:00:00
abstract::This study was designed to ascertain the long-term safety and efficacy profile of the somatostatin analogue octreotide as treatment of refractory acromegaly. Eight patients (aged 21-62 years) with persistent growth hormone (GH) elevation (duration 1-15 years) despite previous therapy were studied. Octreotide was given...
journal_title:European journal of endocrinology
pub_type: 临床试验,杂志文章
doi:10.1530/eje.0.1320429
更新日期:1995-04-01 00:00:00
abstract:OBJECTIVE:The malignancy of thyroid oncocytic tumours, or oncocytomas, is higher than that of follicular tumours. The aim of this study was to investigate the role of thyroid-specific genes in oncocytic tumours and papillary carcinomas. DESIGN AND METHODS:We compared 29 oncocytic tumours with 12 papillary carcinomas. ...
journal_title:European journal of endocrinology
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doi:10.1530/eje.0.1500269
更新日期:2004-03-01 00:00:00
abstract::The mineralocorticoid receptor (MR), a member of the steroid receptor family, acts as a transcription factor and mediates both aldosterone and cortisol effects. Aldosterone specificity in some tissues results from the inactivation of competing cortisol into cortisone by 11beta-hydroxysteroid dehydrogenase. In other ti...
journal_title:European journal of endocrinology
pub_type: 杂志文章
doi:10.1530/eje.0.1380702
更新日期:1998-06-01 00:00:00
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pub_type: 杂志文章
doi:10.1530/eje.0.1410303
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journal_title:European journal of endocrinology
pub_type: 杂志文章
doi:10.1530/EJE-13-1022
更新日期:2014-08-01 00:00:00
abstract::The objective was to compare the changes in prostaglandin synthesis and metabolism occurring within the fetal membranes that are associated with the onset of parturition and to study the effect of steroid hormones on prostaglandin metabolism. A tissue explant study was made of discs of amnion and chorion obtained from...
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pub_type: 杂志文章
doi:10.1530/eje.0.1330527
更新日期:1995-11-01 00:00:00
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pub_type: 杂志文章
doi:10.1530/EJE-10-0929
更新日期:2011-03-01 00:00:00
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pub_type: 杂志文章
doi:10.1530/eje.1.02288
更新日期:2006-11-01 00:00:00
abstract:OBJECTIVES:The French Acromegaly Registry records data of acromegalic patients' since 1992 in French, Belgian (Liège), and Swiss (Lausanne) centers. We studied the prevalence of diabetes in this population looking for risk factors. Patients from one of the centers (Reims) were then analyzed more thoroughly. METHODS:Th...
journal_title:European journal of endocrinology
pub_type: 杂志文章
doi:10.1530/EJE-10-1050
更新日期:2011-06-01 00:00:00
abstract::An increased calcitonin serum level is suggestive of a medullary thyroid cancer (MTC), but is not pathognomonic. The possibility of false positives or other calcitonin-secreting neuroendocrine neoplasms (NENs) should be considered. Serum calcitonin levels are generally assessed by immunoradiometric and chemiluminescen...
journal_title:European journal of endocrinology
pub_type: 杂志文章,评审
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更新日期:2020-12-01 00:00:00
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journal_title:European journal of endocrinology
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更新日期:2014-02-01 00:00:00
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pub_type: 杂志文章
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更新日期:2014-03-13 00:00:00
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journal_title:European journal of endocrinology
pub_type: 临床试验,杂志文章,多中心研究
doi:10.1530/EJE-08-0420
更新日期:2008-10-01 00:00:00
abstract:CONTEXT:Acromegaly is a rare disease associated with chronic multisystem complications. National registries have been created in several countries. DESIGN:The French Registry contains data on acromegaly epidemiology, management and comorbidities recorded over more than three decades, retrospectively until 1999 and pro...
journal_title:European journal of endocrinology
pub_type: 杂志文章,多中心研究
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更新日期:2017-05-01 00:00:00
abstract:BACKGROUND:Ghrelin is a peptide mainly secreted by gastric mucosa and has been implicated in the regulation of eating behavior and weight balance. Obesity and Helicobacter pylori infection are associated with changes in plasma ghrelin levels. OBJECTIVE:This study was designed to evaluate the density of ghrelin-produci...
journal_title:European journal of endocrinology
pub_type: 杂志文章
doi:10.1530/EJE-11-0201
更新日期:2011-07-01 00:00:00
abstract::Nitric oxide mediates a wide array of cellular functions in many tissues. It is generated by three known isoforms of nitric oxide synthases (NOS). Recently, the endothelial isoform, NOSIII, was shown to be abundantly expressed in the rat thyroid gland and its expression increased in goitrous glands. In this study, we ...
journal_title:European journal of endocrinology
pub_type: 杂志文章
doi:10.1530/eje.0.1360649
更新日期:1997-06-01 00:00:00
abstract:BACKGROUND:The association of hyperparathyroidism (HPT) with thyroid disease has long been known, but the mechanisms underlying such an association have not yet been clarified. OBJECTIVE:To elucidate the main factors determining this combination of endocrine diseases, in a retrospective multicenter study. METHODS:We ...
journal_title:European journal of endocrinology
pub_type: 杂志文章,多中心研究
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更新日期:2001-10-01 00:00:00