Linked Life Data

1758574

Source:http://linkedlifedata.com/resource/pubmed/id/1758574

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
1992-2-6
pubmed:abstractText
The effects of noradrenergic and opioid peptidergic receptor blockade, either alone or in combination, on the electrical activity of luteinizing hormone-releasing hormone (LHRH) pulse generator were studied in ovariectomized rats fitted with chronically implanted electrode arrays in the medial basal hypothalamus. Both alpha- and beta-adrenergic receptor antagonists, i.e. phenoxybenzamine (5 mg/kg i.v.) and propranolol (5 mg/kg i.v.), respectively, significantly increased the intervals between characteristic increases (volleys) in hypothalamic multiunit activity (MUA), which were associated with the initiation of LH pulses. In contrast to this, an opioid receptor antagonist naloxone (2 mg/kg i.v.) significantly decreased the intervals between the MUA volleys. Naloxone given after the injection of propranolol induced MUA volleys with a latency of a few minutes. However, when given after the injection of phenoxybenzamine, naloxone failed to induce such immediate MUA volleys. These changes in the intervals between the MUA volleys were faithfully reflected by the pulsatile LH secretion. These results suggest that norepinephrine facilitates LHRH pulse generator activity through both alpha- and beta-adrenergic-receptors, and that the action of opioid peptides on it requires an alpha-adrenergic receptor-mediated mechanism.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Oct
pubmed:issn
0028-3835
pubmed:author
pubmed:issnType
Print
pubmed:volume
54
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
321-6
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1991
pubmed:articleTitle
Interactions between the noradrenergic and opioid peptidergic systems in controlling the electrical activity of luteinizing hormone-releasing hormone pulse generator in ovariectomized rats.
pubmed:affiliation
Department of Physiology, Yokohama City University School of Medicine, Japan.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't