Linked Life Data

11994132

Source:http://linkedlifedata.com/resource/pubmed/id/11994132

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
8
pubmed:dateCreated
2002-5-7
pubmed:abstractText
Prolactin (PRL) has recently been shown to exert an anxiolytic effect in male and virgin female rats, as well as an inhibitory tone on hypothalamic-pituitary-adrenal (HPA) axis activity. Reduced emotional and neuroendocrine stress responses have been described in lactation, a time of high blood PRL levels. Here we tested brain PRL-receptor (PRL-R)-mediated effects on anxiety, maternal behaviour, HPA axis and oxytocin stress responses in lactating rats. Chronic intracerebroventricular (i.c.v.) infusion of antisense oligonucleotides against the long form of the PRL-R (AS; osmotic minipump, 0.5 microg/0.5 microL/h) in order to downregulate brain PRL-R expression increased the anxiety-related behaviour on the elevated plus maze (P < 0.01) compared with mixed bases- and vehicle-treated rats. Also, PRL-R AS treatment impaired maternal behaviour (P < 0.05), whereas physiological parameters of lactation (weight gain of the litter, number of milk ejection reflexes during a 20-min suckling period) were not affected. PRL-R AS treatment further evoked an increase (P < 0.05) in the stress-induced adrenocorticotropin release, demonstrating an inhibitory role of PRL on HPA axis responses in lactation. Inhibition of stress responses of the oxytocin system by brain PRL was evidenced by higher stress-induced (P < 0.05) plasma oxytocin concentration in PRL-R AS-treated lactating rats and, in contrast, decreased stress-induced oxytocin release (P < 0.01) in chronic i.c.v. ovine PRL-treated (1 microg/0.5 microL/h) virgin rats. Finally, an increased expression of the hypothalamic PRL gene was seen by RT-PCR in pregnancy and lactation, suggesting an activated state of the brain PRL system during the peripartum period. In summary, activation of the brain PRL system in the peripartum period significantly contributes to emotional and neuroendocrine adaptations, including downregulation of the responsiveness of the HPA axis and oxytocin systems to stressors seen at this time.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Apr
pubmed:issn
0953-816X
pubmed:author
pubmed:issnType
Print
pubmed:volume
15
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1381-9
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed-meshheading:11994132-Adrenocorticotropic Hormone, pubmed-meshheading:11994132-Animals, pubmed-meshheading:11994132-Animals, Newborn, pubmed-meshheading:11994132-Anxiety, pubmed-meshheading:11994132-Behavior, Animal, pubmed-meshheading:11994132-Down-Regulation, pubmed-meshheading:11994132-Female, pubmed-meshheading:11994132-Gene Expression Regulation, pubmed-meshheading:11994132-Hypothalamo-Hypophyseal System, pubmed-meshheading:11994132-Lactation, pubmed-meshheading:11994132-Male, pubmed-meshheading:11994132-Maternal Behavior, pubmed-meshheading:11994132-Oligonucleotides, Antisense, pubmed-meshheading:11994132-Oxytocin, pubmed-meshheading:11994132-Pregnancy, pubmed-meshheading:11994132-Prolactin, pubmed-meshheading:11994132-RNA, Messenger, pubmed-meshheading:11994132-Rats, pubmed-meshheading:11994132-Rats, Wistar, pubmed-meshheading:11994132-Receptors, Prolactin, pubmed-meshheading:11994132-Stress, Physiological, pubmed-meshheading:11994132-Up-Regulation
pubmed:year
2002
pubmed:articleTitle
Increased hypothalamic expression of prolactin in lactation: involvement in behavioural and neuroendocrine stress responses.
pubmed:affiliation
Institute of Zoology, University of Regensburg, Universitätsstr. 31, 93053 Regensburg, Germany. luz.torner@biologie.uni-regensburg.de
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't