Abstract:
:The present study was aimed to examine the possible functional relationship between melatonin and hypothalamic transmitters, endogenous opioids and excitatory amino acids in controlling gonadotropin secretion in ovariectomized estrogen-primed rats. An intravenous injection of naloxone (mu opioid receptor antagonist), N-methyl-D-aspartate (NMDA; NMDA receptor agonist) or luteinizing hormone-releasing hormone (LHRH) significantly elevated serum luteinizing hormone (LH) concentrations within 10 min. An intraventricular treatment with melatonin, which did not affect the basal LH concentration by itself, significantly suppressed the effect of naloxone. However, the same melatonin treatment did not inhibit the NMDA-induced or LHRH-induced LH secretion. These results support the hypothesis that melatonin has a suprapituitary site of action to inhibit LHRH release, and suggest that the site of its action may be located downstream to that of naloxone action and upstream to that of NMDA in the hypothalamic LHRH neuronal pathway.
journal_name
Endocr Jjournal_title
Endocrine journalauthors
Akema T,Ikeda T,Chiba A,Sugiyama H,Sato I,Kimura F,Toyoda Jdoi
10.1507/endocrj.46.831subject
Has Abstractpub_date
1999-12-01 00:00:00pages
831-6issue
6eissn
0918-8959issn
1348-4540journal_volume
46pub_type
杂志文章abstract::Some categories of drugs are known for causing hyperglycemia or diabetes such as steroids, antipsychotics, and immunosuppressant. However, there has been little evidence from studies about the proportion of each drug in the context of drug-induced diabetes. In this study, we used data from the Japanese Adverse Drug Ev...
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journal_title:Endocrine journal
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journal_title:Endocrine journal
pub_type: 杂志文章
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journal_title:Endocrine journal
pub_type: 临床试验,杂志文章
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journal_title:Endocrine journal
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journal_title:Endocrine journal
pub_type: 杂志文章
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journal_title:Endocrine journal
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