Linked Life Data

8724446

Source:http://linkedlifedata.com/resource/pubmed/id/8724446

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1996-11-27
pubmed:abstractText
Male Wistar rats (250-350 g) were injected (SC) daily with the putative selective dopamine D3 receptor agonist, 7-OH-DPAT (0.01, 0.10, or 1.0 g/kg) or vehicle for 10 days. Fifteen minutes after each injection, the rats were tested for locomotor activity in photocell arenas for 20 min or 2 h. In two experiments, following this subchronic treatment, all rats received a challenge injection of apomorphine (1.0 mg/kg, SC), or cocaine (10 mg/kg, IP) on day 11, and were tested for locomotor activity. In a third experiment, dopamine synthesis in striatal and mesolimbic (nucleus accumbens-olfactory turbercle) tissue was assessed following acute or chronic 7-OH-DPAT treatments by measuring the accumulation of dihydroxyphenylalanine (DOPA) after treatment with a DOPA decarboxylase inhibitor. Major findings were as follows: a) acute 7-OH-DPAT treatment produced a dose-dependent decrease in locomotor activity; b) when tested for 2 h, the 1.0 mg/kg dose of 7-OH-DPAT produced a progressively greater increase in activity across the 10 test days (i.e., behavioral sensitization); c) subchronic treatment with 7-OH-DPAT did not result in cross-sensitization to either apomorphine or cocaine; d) acute treatment with the 1.0 mg/kg dose of 7-OH-DPAT significantly decreased dopamine synthesis in both striatal and mesolimbic regions; and e) chronic 7-OH-DPAT treatments did not affect basal dopamine synthesis in either brain region. Although the behavioral effects of 7-OH-DPAT were similar to the reported effects of the D2/D3 dopamine agonist quinpirole, the effects of repeated 7-OH-DPAT treatments differed from those of quinpirole in terms of cross-sensitization and basal dopamine synthesis. These results suggest that locomotor inhibition produced by low doses of 7-OH-DPAT is not related to dopamine autoreceptor stimulation, and the development of behavioral sensitization to high doses of 7-OH-DPAT is not due to the development of dopamine autoreceptor subsensitivity.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
0033-3158
pubmed:author
pubmed:issnType
Print
pubmed:volume
125
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
33-42
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1996
pubmed:articleTitle
Repeated 7-OH-DPAT treatments: behavioral sensitization, dopamine synthesis and subsequent sensitivity to apomorphine and cocaine.
pubmed:affiliation
Department of Psychology, Morehead State University, KY 40351-1689, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't