Abstract:
:Bovine median eminence contains a factor difference from gonadotropin-releasing hormone (GnRH) than increases basal luteinizing hormone (LH) secretion and potentiates GnRH-stimulated LH release. We compared the effect of hypothalamic neuropeptides on basal and GnRH-stimulated LH secretion using rat pituitary cells under static incubation conditions to determine if any of them mimics the LH-releasing activity no attributable to GnRH present in bovine median eminence extracts. Both, galanin and neurotensin (10(-9)-10(-5)) stimulated basal LH secretion in a dose-response manner. Galanin increased 3-4 fold and neurotensin doubled the basal LH secretion. The GnRH antagonist Nal-Glu 10(-6) M abolished the effect of 10(-7) M GnRH and 10(-5)M neurotensin, but did not block the LH-releasing activity of galanin. Leucin-enkephalin, beta-endorphin, substance P and neuropeptide Y (NPY) did not alter basal LH secretion. Neuropeptides produced three types of response on GnRH-stimulated LH release. First, leucine-enkephalin and beta-endorphin (10(-9)-10(-5) M) showed a dose-dependent inhibition of GnRH-stimulated LH release. At 10(-5) M the inhibition was complete with leucine-enkephalin and only 30% with beta-endorphin. Both were blocked by naloxone. Second, substance P showed an inverted U type response on GnRH-stimulated LH secretion. At 10(-9) M this peptide potentiated the action of GnRH. This effect decreased when the dose of substance P was increased to 10(-7) M and turned inhibitory at 10(-5) M when 10(-7) M GnRH was used. Third, galanin and NPY potentiated the effect of GnRH on LH secretion. Neurotensin had no effect on GnRH-stimulated LH release. In conclusion, rat gonadotrophs present diverse responses to neuropeptides at physiological concentrations, and -apart from GnRH-galanin is most likely the other factor present in bovine median eminence extracts that stimulates LH secretion. The data lend further support to a role of galanin in the control of LH secretion.
journal_name
Biol Resjournal_title
Biological researchauthors
Leiva LA,Croxatto HBsubject
Has Abstractpub_date
1994-01-01 00:00:00pages
113-21issue
2eissn
0716-9760issn
0717-6287journal_volume
27pub_type
杂志文章abstract::Bilateral aspiration lesions of the fimbria-fornix were performed in 10 male Sprague Dawley rats weighing 240-300 g under chloral hydrate narcose (420 mg/kg). Another 9 animals were operated in the same way, but no aspiration was carried out to constitute a control group. A week after surgery recording and stimulation...
journal_title:Biological research
pub_type: 杂志文章
doi:
更新日期:1996-01-01 00:00:00
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journal_title:Biological research
pub_type: 杂志文章
doi:10.1186/s40659-018-0199-y
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journal_title:Biological research
pub_type: 杂志文章,评审
doi:10.1186/0717-6287-47-66
更新日期:2014-12-10 00:00:00
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journal_title:Biological research
pub_type: 杂志文章
doi:10.1186/s40659-017-0121-z
更新日期:2017-04-12 00:00:00
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journal_title:Biological research
pub_type: 杂志文章,评审
doi:10.4067/S0716-97602013000100003
更新日期:2013-01-01 00:00:00
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journal_title:Biological research
pub_type: 杂志文章
doi:10.1186/s40659-020-00316-0
更新日期:2020-10-20 00:00:00
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journal_title:Biological research
pub_type: 杂志文章,评审
doi:/S0716-97602007000500009
更新日期:2007-01-01 00:00:00
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journal_title:Biological research
pub_type: 杂志文章
doi:
更新日期:1998-01-01 00:00:00
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journal_title:Biological research
pub_type: 杂志文章,评审
doi:10.4067/s0716-97602004000400028
更新日期:2004-01-01 00:00:00
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pub_type: 杂志文章
doi:10.1186/s40659-019-0262-3
更新日期:2019-10-03 00:00:00
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journal_title:Biological research
pub_type: 临床试验,杂志文章
doi:10.4067/s0716-97602004000200007
更新日期:2004-01-01 00:00:00
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journal_title:Biological research
pub_type: 杂志文章
doi:10.1186/s40659-018-0179-2
更新日期:2018-09-04 00:00:00
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journal_title:Biological research
pub_type: 杂志文章
doi:
更新日期:1993-01-01 00:00:00
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journal_title:Biological research
pub_type: 杂志文章
doi:10.4067/s0716-97602004000100011
更新日期:2004-01-01 00:00:00
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journal_title:Biological research
pub_type: 杂志文章
doi:10.4067/s0716-97602004000200017
更新日期:2004-01-01 00:00:00
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journal_title:Biological research
pub_type: 杂志文章
doi:/S0716-97602010000200013
更新日期:2010-01-01 00:00:00
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journal_title:Biological research
pub_type: 杂志文章
doi:10.4067/s0716-97602001000100012
更新日期:2001-01-01 00:00:00
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journal_title:Biological research
pub_type: 杂志文章
doi:10.4067/s0716-97602002000300012
更新日期:2002-01-01 00:00:00
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journal_title:Biological research
pub_type: 杂志文章
doi:10.1186/s40659-016-0080-9
更新日期:2016-03-18 00:00:00
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journal_title:Biological research
pub_type: 杂志文章,评审
doi:
更新日期:1993-01-01 00:00:00
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journal_title:Biological research
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doi:10.1186/s40659-017-0149-0
更新日期:2018-01-03 00:00:00
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journal_title:Biological research
pub_type: 杂志文章
doi:10.4067/s0716-97602000000200013
更新日期:2000-01-01 00:00:00
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journal_title:Biological research
pub_type: 杂志文章
doi:/S0716-97602008000300004
更新日期:2008-01-01 00:00:00
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journal_title:Biological research
pub_type: 杂志文章
doi:10.4067/s0716-97602006000100012
更新日期:2006-01-01 00:00:00
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journal_title:Biological research
pub_type: 杂志文章
doi:10.1186/s40659-017-0141-8
更新日期:2017-10-17 00:00:00
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journal_title:Biological research
pub_type: 杂志文章,评审
doi:
更新日期:1995-01-01 00:00:00
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journal_title:Biological research
pub_type: 杂志文章
doi:10.1186/s40659-019-0241-8
更新日期:2019-07-05 00:00:00
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journal_title:Biological research
pub_type: 杂志文章
doi:/S0716-97602011000400008
更新日期:2011-01-01 00:00:00
abstract::The purpose of this study was to carry out a bibliometric analysis of the articles published in Chile during 1987-2006 that were categorized into the Plant Science discipline by ISI. The data was extracted from the Web of Science datábase, obtaining a total of 911 articles for analysis. Almost half of the articles wer...
journal_title:Biological research
pub_type: 杂志文章
doi:/S0716-97602008000200002
更新日期:2008-01-01 00:00:00
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journal_title:Biological research
pub_type: 杂志文章
doi:/S0716-97602009000200013
更新日期:2009-01-01 00:00:00