Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1-2
pubmed:dateCreated
1995-3-22
pubmed:abstractText
In the present study the hypothesis has been tested if the dopamine releasing drug D-amphetamine via volume transmission can, at least partly, restore dopamine communication in the dopaminergically denervated neostriatum of rats. The experimental model used, has been a unilateral 6-hydroxydopamine-induced degeneration of the nigrostriatal dopamine neurons, based on nigral microinjections of this neurotoxin. Studies on c-fos like immunoreactivity after systemic D-amphetamine treatment demonstrated a wide-spread appearance of c-fos like immunoreactive neuronal nuclear profiles within the neostriatum on both the unlesioned and denervated side. In the unlesioned neostriatum a peak density of c-fos like immunoreactive profiles was found within the central part of the neostriatum, while on the denervated side the distribution pattern of c-fos like immunoreactive profiles peaked medially and gradually declined in a lateral direction. The microdialysis experiments demonstrated, after systemic d-amphetamine treatment, a marked and sustained increase of extracellular dopamine levels in the neostriatum on the unlesioned side, while no increases in the extracellular dopamine levels were observed on the dopaminergically denervated neostriatum. In the electrophysiological experiments, systemic D-amphetamine treatment produced an inhibition of the neuronal activity on the denervated side which showed a significant increase in basal discharge rate compared with the recordings obtained from the striata on the unlesioned side. The present immunocytochemical microdialysis and electrophysiological analysis provides evidence that in the unilaterally markedly dopamine depleted neostriatum with clearcut signs of dopamine receptor supersensitivity (rotational behaviour results), dopamine transmission may be partly restored via systemic D-amphetamine treatment through the release of dopamine, predominantly from the unlesioned neostriatum, which may diffuse into the cerebrospinal fluid to reach the contralateral dopaminergically denervated neostriatum.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Oct
pubmed:issn
0006-8993
pubmed:author
pubmed:issnType
Print
pubmed:day
31
pubmed:volume
662
pubmed:geneSymbol
c-fos
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
11-24
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1994
pubmed:articleTitle
Evidence for volume transmission in the dopamine denervated neostriatum of the rat after a unilateral nigral 6-OHDA microinjection. Studies with systemic D-amphetamine treatment.
pubmed:affiliation
Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't