Linked Life Data

7902968

Source:http://linkedlifedata.com/resource/pubmed/id/7902968

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
1994-1-13
pubmed:abstractText
The ewe's ability to selectively recognize her lamb depends upon vaginocervical feedback to the brain stimulating an interest in lamb odours. This process is facilitated by previous maternal experience. We have used in vivo microdialysis to measure changes in the release of intrinsic transmitters in the olfactory bulb (glutamate, dopamine and GABA) at parturition to determine if their release profiles differ depending upon the ewe's past maternal olfactory experience. Glutamate and GABA release increased significantly at parturition in multiparous but not primiparous ewes. Dopamine release increased in both groups but mean basal levels of this transmitter were significantly higher in primiparous ewes during the pre-partum period and the first few hours postpartum. The changes in the underlying neural circuitry which determine these differences are established within 6 h of parturition, as revealed by artificial stimulation of the reproductive tract. This procedure renders the system plastic enabling adoption of strange lambs and, contingent, on this, the release of intrinsic transmitters no longer differs between the two groups of ewes. Pharmacological challenges to the olfactory bulb using retrodialysis in nulliparous and multiparous (maternally inexperienced and experienced) ewes produced significant differences between the groups for induction of glutamate and GABA release, but not that of dopamine. K+ challenges produced greater increases in glutamate and GABA release in multiparous than in nulliparous ewes, while dopamine release did not differ with experience. Glutamate receptor blockade produced increases in glutamate ase without changing GABA release.(ABSTRACT TRUNCATED AT 250 WORDS)
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Oct
pubmed:issn
0306-4522
pubmed:author
pubmed:issnType
Print
pubmed:volume
56
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
557-65
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed-meshheading:7902968-Animals, pubmed-meshheading:7902968-Cervix Uteri, pubmed-meshheading:7902968-Dopamine, pubmed-meshheading:7902968-Electric Stimulation, pubmed-meshheading:7902968-Excitatory Amino Acid Antagonists, pubmed-meshheading:7902968-Female, pubmed-meshheading:7902968-GABA Antagonists, pubmed-meshheading:7902968-Glutamates, pubmed-meshheading:7902968-Glutamic Acid, pubmed-meshheading:7902968-Labor, Obstetric, pubmed-meshheading:7902968-Maternal Behavior, pubmed-meshheading:7902968-Microdialysis, pubmed-meshheading:7902968-Neuronal Plasticity, pubmed-meshheading:7902968-Neurons, pubmed-meshheading:7902968-Neurotransmitter Agents, pubmed-meshheading:7902968-Olfactory Bulb, pubmed-meshheading:7902968-Potassium Chloride, pubmed-meshheading:7902968-Pregnancy, pubmed-meshheading:7902968-Receptors, GABA, pubmed-meshheading:7902968-Receptors, Glutamate, pubmed-meshheading:7902968-Sheep, pubmed-meshheading:7902968-Vagina, pubmed-meshheading:7902968-gamma-Aminobutyric Acid
pubmed:year
1993
pubmed:articleTitle
Influence of birth and maternal experience on olfactory bulb neurotransmitter release.
pubmed:affiliation
Sub-Department of Animal Behaviour, University of Cambridge, Madingley, U.K.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't