Abstract:
OBJECTIVE:Free fatty acids (FFAs) deplete the intracellular insulin stores of pancreatic beta-cells. It has been suggested that this results from a lipotoxic dysregulation of both insulin secretion and insulin synthesis. In the present study, this hypothesis was tested within a 12-h time-course by directly relating the FFA-induced loss of intracellular insulin to corresponding parameters of insulin secretion and de novo biosynthesis. Palmitate, cis-monoenic oleate and the trans-monoenic elaidate were employed as model FFAs to elucidate potentially different effects due to chain length and configuration. METHODS:INS-1 cells were incubated for 1, 4 or 12 h with 11.2 mmol/l glucose with 200 micromol/l palmitate, oleate or elaidate and compared with non-FFA-exposed controls with respect to content and secretion of immunoreactive insulin (IRI). Biosynthesis of insulin was monitored by pulse-labeling experiments and by Northern blot analysis. RESULTS:IRI content dropped by 50-60% after a short-term exposure with all FFAs employed (P< or =0.001). It tended to recover after 12 h of treatment with oleate and elaidate but not with palmitate. FFA treatment increased insulin secretion by 25% (P< or =0.05) which could not account quantitatively for the intracellular loss. FFA-induced changes in insulin biosynthesis did not correlate clearly with the FFA-induced intracellular loss. CONCLUSIONS:The FFA-induced loss of IRI is an acute effect independent of the FFA employed. It cannot be sufficiently explained by FFA-induced perturbances of IRI secretion and biosynthesis. We therefore postulate an additional FFA-triggered mechanism, e.g. intracellular IRI degradation.
journal_name
Eur J Endocrinoljournal_title
European journal of endocrinologyauthors
Bollheimer LC,Kemptner DM,Kagerbauer SM,Kestler TM,Wrede CE,Buettner Rdoi
10.1530/eje.0.1480481subject
Has Abstractpub_date
2003-04-01 00:00:00pages
481-6issue
4eissn
0804-4643issn
1479-683Xjournal_volume
148pub_type
杂志文章abstract:OBJECTIVE:Epigenetic changes contribute to pancreatic neuroendocrine tumor (PanNET) development. Hypermethylation of promoter DNA as a cause of tumor suppressor gene silencing is a well-established oncogenic mechanism that is potentially reversible and therefore an interesting therapeutic target. Multiple endocrine neo...
journal_title:European journal of endocrinology
pub_type: 杂志文章
doi:10.1530/EJE-18-0195
更新日期:2018-09-01 00:00:00
abstract::Ionomycin, which mobilizes Ca2+, and phorbol 12-myristate 13-acetate (PMA), which activates protein kinase C (PKC), were used to compare the effects/interactions of Ca2+ and PKC on luteinizing hormone (LH) secretion from pituitaries of intact male and acutely ovariectomized (72 h) rats. Quartered pituitaries from dono...
journal_title:European journal of endocrinology
pub_type: 杂志文章
doi:10.1530/eje.0.1300151
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abstract:OBJECTIVE:Amine precursor uptake and decarboxylation is a classical feature of gastroenteropancreatic (GEP) neuroendocrine tumors (NET). Production of catecholamines was studied in GEP NET and non-NET patients. DESIGN:A cross-sectional study was undertaken. METHODS:We studied catecholamine and metabolite secretion in...
journal_title:European journal of endocrinology
pub_type: 临床试验,杂志文章
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更新日期:1999-05-01 00:00:00
abstract:OBJECTIVE:The DAZ (deleted in azoospermia) gene family on the Y chromosome long arm is the major candidate for the AZFc (azoospermia factor c) phenotype of male infertility and it is expressed only in germ cells. The aim of the study was to assess Sertoli cell function in subjects with AZFc deletions. DESIGN:Case-cont...
journal_title:European journal of endocrinology
pub_type: 杂志文章
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更新日期:2002-06-01 00:00:00
abstract:OBJECTIVE:Somapacitan is a reversible albumin-binding growth hormone (GH) derivative, developed for once-weekly administration. This study aimed to evaluate the safety of once-weekly somapacitan vs once-daily Norditropin®. Local tolerability and treatment satisfaction were also assessed. DESIGN:26-week randomized, con...
journal_title:European journal of endocrinology
pub_type: 杂志文章,多中心研究,随机对照试验
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更新日期:2018-05-01 00:00:00
abstract:OBJECTIVE:Identification and characterization of calcium-sensing receptor (CASR) mutations in four unrelated Italian kindreds with familial hypocalciuric hypercalcemia. DESIGN:Clinical evaluation and genetic analysis of CASR gene. Functional characterization of mutated CASRs. METHODS:Direct sequencing of CASR gene in...
journal_title:European journal of endocrinology
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doi:10.1530/EJE-08-0798
更新日期:2009-03-01 00:00:00
abstract:OBJECTIVE:Vitamin D insufficiency is common in primary hyperparathyroidism (pHPT). Patients with pHPT frequently have a reduced health-related quality of life (HRQoL). Our objectives were to evaluate whether HRQoL in pHPT is associated with vitamin D insufficiency and whether vitamin D supplementation after parathyroid...
journal_title:European journal of endocrinology
pub_type: 杂志文章,随机对照试验
doi:10.1530/EJE-14-0757
更新日期:2015-02-01 00:00:00
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更新日期:2008-03-01 00:00:00
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doi:10.1530/EJE-13-1025
更新日期:2014-06-01 00:00:00
abstract::A pheochromocytoma in a pregnant patient is one of the most threatening medical conditions for mother, fetus, and physician. Although extraordinarily rare with a frequency of 0.002% of all pregnancies, this tumor is notorious for its devastating consequences. As in non-pregnant patients, the signs and symptoms are qui...
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pub_type: 杂志文章,评审
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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
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pub_type: 临床试验,杂志文章
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journal_title:European journal of endocrinology
pub_type: 杂志文章
doi:10.1530/EJE-13-0572
更新日期:2013-10-01 00:00:00
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journal_title:European journal of endocrinology
pub_type: 杂志文章
doi:10.1530/eje.0.1330235
更新日期:1995-08-01 00:00:00
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journal_title:European journal of endocrinology
pub_type: 杂志文章
doi:10.1530/eje.0.1300502
更新日期:1994-05-01 00:00:00
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pub_type: 杂志文章
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更新日期:2013-03-15 00:00:00
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更新日期:2011-10-01 00:00:00
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journal_title:European journal of endocrinology
pub_type: 杂志文章,评审
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pub_type: 杂志文章
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更新日期:2002-01-01 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
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更新日期:2006-01-01 00:00:00
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journal_title:European journal of endocrinology
pub_type: 杂志文章
doi:10.1530/eje.0.1320594
更新日期:1995-05-01 00:00:00
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journal_title:European journal of endocrinology
pub_type: 杂志文章
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更新日期:2015-04-01 00:00:00
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journal_title:European journal of endocrinology
pub_type: 杂志文章
doi:10.1530/eje.0.1440139
更新日期:2001-02-01 00:00:00
abstract::Pyridostigmine (PST), a cholinesterase inhibitor, induces a clear growth hormone (GH) release in man by suppression of hypothalamic somatostatin (SRIH). Somatostatin suppresses thyrotrophin (TSH) release in rats and men. Earlier studies showed that the thryotrophin-releasing hormone (TRH)-induced TSH response was not ...
journal_title:European journal of endocrinology
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1530/eje.0.1330457
更新日期:1995-10-01 00:00:00
abstract::To know the role of sex hormone-binding globulin (SHBG) in the intracellular steroidal actions in human ovarian cancers, the expression of SHBG mRNA as a substitute for intracellular SHBG expression was investigated in normal ovarian tissues and ovarian tumors. In the present study, we used competitive reverse transcr...
journal_title:European journal of endocrinology
pub_type: 杂志文章
doi:10.1530/eje.0.1330327
更新日期:1995-09-01 00:00:00
abstract:OBJECTIVE:To evaluate the effect of the growth factor activin A on the secretion of prolactin (PRL) and GH in cultured GH3 cells. METHODS:The concentrations of PRL and GH secreted from GH3 cells cultured in media with and without activin A were measured by RIA, and the expression of PRL mRNA and GH mRNA were analyzed ...
journal_title:European journal of endocrinology
pub_type: 杂志文章
doi:10.1530/eje.0.1420506
更新日期:2000-05-01 00:00:00
abstract::Signalling of receptor activator of nuclear factor-κB (RANK) ligand (RANKL) through RANK is a critical pathway to regulate the differentiation and activity of osteoclasts and, hence, a master regulator of bone resorption. Increased RANKL activity has been demonstrated in diseases characterised by excessive bone loss s...
journal_title:European journal of endocrinology
pub_type: 杂志文章,评审
doi:10.1530/EJE-11-0454
更新日期:2011-12-01 00:00:00