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 donor animals were perifused at 0.25 ml/min and sequential effluent fractions were collected every 10 min. Continuous administration (4 h) of 1 nmol of gonadotropin-releasing hormone (GnRH) resulted in an increase in LH secretion. Cycloheximide (5 mumol) dissociated the GnRH-stimulated LH responses into protein synthesis-independent and -dependent components. While ionomycin (10 mumol) stimulated LH secretion from pituitaries of both sexes by protein synthesis-independent mechanisms, PMA (1 mumol) and the inactive phorbol ester, 4 alpha-phorbol 12,13-didecanoate (PDD), were ineffective secretagogues. However, PMA (but not PDD) interacted synergistically with ionomycin and GnRH to augment LH secretion by protein synthesis-dependent mechanisms. These results suggest a similarity in the effects/interactions of Ca2+ and PKC in gonadotropes from male and ovariectomized rats. If the effects of PMA can be attributed to PKC activation, then it also appears that Ca2+ mobilization is necessary for the manifestation of PKC as a mediator of LH secretion from these gonadotropes. While PKC activity can be divorced from the protein synthesis-independent component of LH release (this component appears to be mediated by Ca2+ mobilization), the enzyme might be involved in amplifying the response to Ca2+ mobilization through synergistic protein synthesis-dependent mechanisms.
journal_name
Eur J Endocrinoljournal_title
European journal of endocrinologyauthors
Das S,Fahmy NW,Bourne GAdoi
10.1530/eje.0.1300151subject
Has Abstractpub_date
1994-02-01 00:00:00pages
151-8issue
2eissn
0804-4643issn
1479-683Xjournal_volume
130pub_type
杂志文章abstract:Objective:Pancreatic neuroendocrine neoplasms (PanNENs) are rare tumors arising from the endocrine pancreas; however, their prognosis differs significantly upon their proliferative state, which is characterized by histopathological grading. MiRNAs are small, noncoding RNAs posttranscriptionally regulating gene expressi...
journal_title:European journal of endocrinology
pub_type: 杂志文章
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更新日期:2018-10-01 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
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更新日期:2002-05-01 00:00:00
abstract:OBJECTIVE:The alpha(2)-adrenergic receptors are involved in the effects of catecholamines on energy metabolism. Of three known subtypes with differential expression, alpha(2A)-adrenergic receptors are also localized in adipose tissue where they counteract the lipolytic activity of beta-adrenergic receptors. This study ...
journal_title:European journal of endocrinology
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更新日期:2001-03-01 00:00:00
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更新日期:2008-04-01 00:00:00
abstract::Glucocorticoids (GCs) inhibit bone formation in vivo and inhibit osteoblast proliferation and collagen synthesis in vitro. These effects may be mediated by alterations in the insulin-like growth factor (IGF) system. In the present study of normal human osteoblast-like (HOB) cells, we tested the hypothesis that dexamet...
journal_title:European journal of endocrinology
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更新日期:1996-05-01 00:00:00
abstract:OBJECTIVE:Binding of thyroglobulin (Tg) to heparin allows efficient Tg interaction with its endocytic receptor, megalin. Rat Tg (rTg) binds to heparin using an exposed carboxyl terminal region (RELPSRRLKRPLPVK, Arg2489-Lys2503) rich in positively charged residues which is, however, not entirely conserved in human Tg (h...
journal_title:European journal of endocrinology
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doi:10.1530/eje.0.1460591
更新日期:2002-04-01 00:00:00
abstract:OBJECTIVE:Increased reverse tritiodothyronine (T(3)) used to be described as a part of euthyroid sick syndrome (ESS). It was demonstrated to be associated with increased mortality in acutely ill patients. It can also be found with low or normal T(3) in non-severely ill subjects but its significance remains unclear. PA...
journal_title:European journal of endocrinology
pub_type: 杂志文章
doi:10.1530/EJE-08-0519
更新日期:2009-02-01 00:00:00
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journal_title:European journal of endocrinology
pub_type: 杂志文章
doi:10.1530/EJE-12-0197
更新日期:2012-07-01 00:00:00
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journal_title:European journal of endocrinology
pub_type: 杂志文章
doi:10.1530/EJE-15-0277
更新日期:2015-09-01 00:00:00
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journal_title:European journal of endocrinology
pub_type: 临床试验,杂志文章
doi:10.1530/eje.0.1490007
更新日期:2003-07-01 00:00:00
abstract::Male age-related bone loss is caused, at least in part, by hypogonadism that occurs with advancing age. The study of the effects of sex steroids on bone physiology in men has recently highlighted the central role of estrogens on bone pathophysiology. This review focuses on particular aspects of bone physiology and pat...
journal_title:European journal of endocrinology
pub_type: 杂志文章,评审
doi:10.1530/eje.1.02088
更新日期:2006-02-01 00:00:00
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journal_title:European journal of endocrinology
pub_type: 杂志文章
doi:10.1530/eje.0.1470835
更新日期:2002-12-01 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:2016-06-01 00:00:00
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doi:10.1530/eje.1.02304
更新日期:2006-12-01 00:00:00
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journal_title:European journal of endocrinology
pub_type: 杂志文章
doi:10.1530/EJE-14-1140
更新日期:2015-08-01 00:00:00
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pub_type: 杂志文章
doi:10.1530/eje.0.1380421
更新日期:1998-04-01 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:1995-07-01 00:00:00
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journal_title:European journal of endocrinology
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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journal_title:European journal of endocrinology
pub_type: 共识发展会议,杂志文章,评审
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更新日期:2014-08-01 00:00:00
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journal_title:European journal of endocrinology
pub_type: 杂志文章
doi:10.1530/eje.0.1320144
更新日期:1995-02-01 00:00:00
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journal_title:European journal of endocrinology
pub_type: 杂志文章
doi:10.1530/eje.0.151s023
更新日期:2004-08-01 00:00:00
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journal_title:European journal of endocrinology
pub_type: 杂志文章
doi:10.1530/eje.0.1450497
更新日期:2001-10-01 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:2018-09-01 00:00:00
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journal_title:European journal of endocrinology
pub_type: 杂志文章
doi:10.1530/eje.0.151u003
更新日期:2004-11-01 00:00:00
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journal_title:European journal of endocrinology
pub_type: 杂志文章
doi:10.1530/eje.0.1420263
更新日期:2000-03-01 00:00:00
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pub_type: 杂志文章
doi:10.1530/eje.0.1480597
更新日期:2003-06-01 00:00:00
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journal_title:European journal of endocrinology
pub_type: 杂志文章
doi:10.1530/eje.0.1440073
更新日期:2001-01-01 00:00:00